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  • Artikel  (1.648)
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  • 1
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    Macro and micro nutrients of tropical seagrasses, Halophila ovalis, H. spinulosa and Halodule uninervis in Johore, Malaysia (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The present study determined and compared contents of macro- (Nitrogen-N, Phosphorus-P, Potassium-K, Calcium-Ca, Magnesium-Mg) and micro- (Zinc-Zn, Iron-Fe, Manganese-Mn, Cupper-Cu) nutrients in four seagrass species big-leaved (BL) Halophila ovalis (R. Br.) Hook. f., small-leaved (SL) H. ovalis (R. Br.) Ascherson, H. spinulosa (R. Br.) Aschers. in Neumayer and Halodule uninervis (Forssk.) Aschers from three locations Merambong shoal, Seluyong shoal-1 and Seluyong shoal-2, Johore, Malaysia on March 2013. Dried seagrass samples were subjected to wet digestion method and concentration determined using a Perkin Elmer 5100 PC atomic absorption spectrophotometer. Macro and micro-nutrients varied with species and locations. Observed macro-nutrient contents were high for N (17320 mg kg-1) in big-leaved (BL) H. ovalis from Seluyong shoal-2, P (2921.33 mg kg-1) in big-leaved (BL) H. ovalis from Seluyong shoal-1, and for K (10942.67 mg kg-1) in H. uninervis from Merambong shoal and for Ca (10576 mg kg-1) in small-leaved (SL) H. ovalis from Merambong shoal. Mg (3534.67 mg kg-1) was comparatively higher in H. spinulosa from Merambong shoal. Micro-nutrients such as Zn ranged from 138.67 mg kg-1 to 212 mg kg-1 and Cu from 13.33 mg kg-1 to17.33 mg kg-1 with no discernible differences between species. Fe concentration was consistently higher in all species. Hierarchically macro and micro-nutrients contents did not show a consistent ordered pattern according to species and location. Based on biplots generated by Principle component analysis (PCA), there were clear separation of seagrass species based on the micro- and macro-nutrient contents with locations from Malaysia and other regions.
    Beschreibung: Published
    Schlagwort(e): Biotechnology ; Halodule sp ; Halophila sp ; Macro-nutrient ; Micro-nutrient ; PCA ; Nitrogen ; Phosphorus ; Potassium ; Calcium ; Magnesium ; Zinc ; Iron ; Manganese ; Cupper
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.246-261
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  • 2
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    Investigation of mercury concentration and its interaction with zinc and selenium at the muscle and liver tissues of Whitecheek Shark (Carcharhinus dussumieri) from Persian Gulf (2017)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Mercury, zinc and selenium concentrations were analyzed in the muscle and liver of 25 Whitecheek Shark (Carcharhinus dussumieri) from the coast of Bandar Abbas. The level of Hg accumulation and its interaction with Zn and Se in Whitecheek Shark were studied. Hg, Zn and Se concentrations were determined by an Advanced Mercury Analyzer (LECO, AMA 254), Atomic Absorption Spectrometer (ASS,PU 9400) and Graphite Furnace Atomic Absorption Spectrophotometry (Perkin Elmer 3030) respectively. The mean (±SD) of Hg, Zn and Se concentrations were 0.05±0.02, 0.92±0.25 and 0.13±0.05µg/g wet wt in the muscle and 1.07±0.86, 1.57±0.43 and 0.46±0.19µg/g wet wt in the liver tissues, respectively. The mean of Hg, Zn and Se in liver tissue was significantly higher than muscle tissue. Also, 64% of liver samples showed levels above the acceptable limit established by WHO and FAO. A positive correlation was found between Hg and Se concentrations in the muscle and liver tissues with weight and length variables were statistically significant. In this study, the accumulation of Se in the muscle and liver of Whitecheek shark showed a positive correlation with Hg concentration. The mean molar ratio of Se to Hg found in the muscle and liver were 6.36±1.77 and 2.74±3.61, respectively. Positive correlations between Hg and Se showed efficient detoxifying mechanism and as a result, the possibility of reduction in toxicity of mercury in both tissues via Se-Hg complexes or the binding of Hg with selenoproteins.
    Beschreibung: Published
    Schlagwort(e): Mercury ; Carcharhinus dussumieri ; Shark ; Whitecheek Shark ; Investigation ; Concentrations ; Interactions ; Zinc ; Selenium ; Muscle ; Liver ; Tissues
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.11-22
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  • 3
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    Quantitive characteristics and chemical composition in Caspian Roach (Rutilus rutilus caspicus) sperm (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: In this study, quantitive characteristics and chemical composition of in roach (Rutilus rutilus caspicus) sperm were investigated. Sperm traits included sperm movement duration, percentage of motile spermatozoa, sperm density, spermatocrit and sperm volume. Some seminal plasma characteristics (sodium, potassium, calcium, magnesium and chloride) were investigated. In addition, some metabolites of seminal plasma (glucose, cholesterol and protein) were measured. The Na+ and K+ ions correlated negatively with spermatozoa motility (r = -0.0518, p〈.05 and r =-0.3597, p〈.01) respectively. Also, there were significant positive correlations between Ca2+ and Cl- ions with spermatozoa motility (r = 0.2945, p〈.05 and r= 0.1379, p〈.01), respectively. Mg+2 was positively correlated with glucose and protein (r = 0.046, p〈.05 and r = 0.694, p〈.05), respectively. On the other hand, a significant positive relationship was found between Na+ and K+ (r = 0.548, p〈.01). These parameters can be used to evaluation of sperm quality and collecting information about developing procedures for artificial fertilization of roach.
    Beschreibung: Published
    Schlagwort(e): Biology ; Physiology ; Rutilus rutilus caspicus ; Sperm motility ; Seminal plasma ; Sperm quality ; Roach ; Spermatozoa ; Potassium ; Sodium ; Calcium ; Magnesium ; Chloride ; Plasma ; Blood
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.81-90
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  • 4
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    Sublethal impacts of heavy metals on antioxidant enzymes and biochemical parameters in rohu (Labeo rohita) (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The present research was designed to study and compare the biochemical parameters in Labeo rohita due to exceptional nutritional value of this fish as a protein source in developing countries. The protein and heavy metal (Zn, Cu, Ni) activities were determined spectrophotometrically. The proximate analysis of L. rohita collected from different localities of Pakistan revealed that the protein (19.97%) and ash contents (1.76%) were highest in hatchery L. rohita while the fat (0.84%), carbohydrate (5.39%) and dry matter contents (24.11%), were maximum in the river L. rohita. In comparison to the hatchery and river L. rohita, the moisture contents (81.42%) were the highest in farmed fish. During enzymatic analysis, maximum activities of the peroxidase, α- amylase and mutarotase were recorded in hatchery fish whereas the catalase and superoxide dismutase activities were found to be the highest in farmed fish. The maximum accumulation of Cu and Ni metals were observed in hatchery fish and least in farmed fish and the highest Zn accumulation was observed in river fish. Analysis of variance on catalase, peroxidase, α-amylase activity and metal accumulation showed statistically significant differences at p〈0.05 among sampling sites and fish organs and interaction between sampling sites and fish organs.
    Beschreibung: Published
    Schlagwort(e): Aquaculture ; Enzymes ; Proximate analysis ; Antioxidant enzymes ; Metals ; Labeo rohita ; Biochemical ; Parameters ; Heavy metals ; Zinc ; Cupper ; Nickel
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.668-683
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  • 5
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    Short communication:Study on bioaccumulation of heavy metals (cadmium, nickel, zinc and lead) in the muscle of wels catfish (Silurus glanis) in the Anzali Wetland (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: After entering aquatic ecosystems, heavy metals accumulate in the organs and tissues of aquatics including fish and finally enter the food chain. These heavy metals can enter the human body through eating contaminated fish. Absorbance values and accumulation of heavy metals in aquatics especially the fish depend on ecological conditions, physical, chemical and biological factors of water, the element type, and the physiological state of the aquatic (Oryan et al., 2010). Among aquatic ecosystems, wetlands and rivers are considerably important from the point of ecology. Rivers act as carriers of nutrients and non–nutrients and wetlands act as sinks for these substances. Now this effect will be more apparent if the wetland is an intermediary between a river and a static ecosystem. The Anzali Wetland is the type of ecosystem that embraces water from 11 rivers from one side and passes water into the Caspian Sea through a second outlet on the other side. The rivers passing through urban and rural areas and forests carry different types of organic matter, minerals, sediment, and industrial sewage (Taheri, 2013). The Anzali Wetland is one of the valuable wetlands registered in the Ramsar International Convention the contamination of which has become the main challenge for the people and officials during the past two decades (Khosravi, 2011).
    Beschreibung: Published
    Schlagwort(e): Wels catfish ; Heavy metals ; Muscle edible tissue ; Wetland ; Silurus glanis ; Cadmium ; Nickel ; Zinc ; Lead
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.244-250
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  • 6
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    Short communication: Study on bioaccumulation of heavy metals (cadmium, nickel, zinc and lead) in the muscle of wels catfish (Silurus glanis) in the Anzali Wetland (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: After entering aquatic ecosystems, heavy metals accumulate in the organs and tissues of aquatics including fish and finally enter the food chain. These heavy metals can enter the human body through eating contaminated fish. Absorbance values and accumulation of heavy metals in aquatics especially the fish depend on ecological conditions, physical, chemical and biological factors of water, the element type, and the physiological state of the aquatic (Oryan et al., 2010). Among aquatic ecosystems, wetlands and rivers are considerably important from the point of ecology. Rivers act as carriers of nutrients and non–nutrients and wetlands act as sinks for these substances. Now this effect will be more apparent if the wetland is an intermediary between a river and a static ecosystem. The Anzali Wetland is the type of ecosystem that embraces water from 11 rivers from one side and passes water into the Caspian Sea through a second outlet on the other side. The rivers passing through urban and rural areas and forests carry different types of organic matter, minerals, sediment, and industrial sewage (Taheri, 2013).
    Beschreibung: Published
    Schlagwort(e): Silurus glanis ; Wels catfish ; Heavy metals ; Muscle edible tissue ; Wetland ; Cadmium ; Nickel ; Zinc ; Lead
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.244-250
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  • 7
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    The effect of heavy metal on Cltlorella vulgaris, Scenedesmus obliquus and Anabaena Flos-aquae (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: In this survey two species of chlorophyta (Chlorella vulgaris and Scenedesmus obliquus ) and one species of blue-green algae (Anabaena flos- aquae) were exposed with heavy metal (zinc) under lab condition ( temp. 25± 2°C,light 3500± 350 lux) for 96 hours. After this time, these species were counted with hemocytometer and based on probit analysis method and was determined ECIO, EC50 and EC90. Amount of EC50 for C vulgaris, S. obliquus and A.flosaquae were 0.134,0.047 and 0.093 mg/lit, respectively and this subject was distincted that S obliquus has more endurance than other species. Mac value of zinc for these species (C. vulgaris, S. obiquus and A.flos-aquae ) were 0.0134, 0.0047 and 0.0093 mg/l respectively. Regression coefficient was 92-98 percent between concentration logaritm of zinc and decrease of these species density.
    Beschreibung: Published
    Schlagwort(e): Zinc ; Ec ; Scenedesmus Obliquus ; Chlorella vulgaris ; Anabaena Fios-Aquae ; Blue-green algae ; Heavy metals ; Species ; C.vulgaris ; S.obiquus ; A.flos-aquae
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.83-90
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  • 8
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    Assessing Pb, Ni and Zn accumulation in the tissues of Liza aurata in the south Caspian Sea (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The liver, kidney, gill, ovary and muscle tissues of the caught Liza aurata have been sampled in spring 2002 in the southern Caspian Sea to assess their contamination with Pb, Ni and Zn by using atomic absorption spectrophotometer method. We found the highest concentration of lead in the liver tissue (17.51 mg/kg), followed by gill (13.95 mg/kg), kidney (5.03 mg/kg) and ovary (4.91 mg/kg). The lowest concentration of lead was detected in muscle tissue (3.01 mg/kg) of Liza aurata. The highest accumulation of Ni and Zn were detected in ovary followed by liver, gill and kidney of the fish with a concentration of 6.23, 6.14, 5.71, and 2.98 mg/kg for nickel and 647.28, 159.85, 75.71 and 65.42 mg/kg for zinc. We observed the lowest concentration of nickel (2.49 mg/kg) and zinc (20.14 mg/kg) in the muscle tissue and also determined the highest contamination of the fish with these chemicals to be occurring in the southwest followed by south center and southeast Caspian Sea.
    Beschreibung: Published
    Schlagwort(e): Brackish ; Tissues ; Kidney ; Nickel ; Zinc
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.65-78
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  • 9
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    Effects of different methods of cooking on mineral and vitamin (A and E) content of yellow fin sea bream (Acanthopagrus latus) fish fillets (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The aim of this study was to evaluate the effect of cooking on the content of minerals and vitamins yellow fin seabream fillets on the baking process. In this study fillets of yellow fin seabream (Acanthopagrus latus) with three methods include steaming, frying and grilling the (grill a) the amount of vitamins (a and E) and minerals (iron, phosphorus, copper, zinc, calcium, magnesium, potassium, sodium) was conducted with a sample of crude compared Grdyd.bray measured amounts of vitamin and mineral content Vitamins high performance liquid chromatography (HPLC) method for measuring atomic absorption spectrophotometry was used minerals. The comparison of all the minerals in samples cooked with raw samples, showed no significant changes (p˂0 /05).The content of vitamin A in the cooked samples, compared to the raw samples decreased significantly (p˂0 /05).the lowest amount of vitamin A were observed in fried samples (66/0 ± 6/7 mg/100gr wet weight ) (p˂0 /05). The content of vitamin E in all cooked samples, compared to the raw samples decreased significantly (p˂0 /05)and the lowest levels of vitamin E was observed in grilled samples (02/0 ± 293/0 mg/100gr wet weight). The results showed that three cooking methods including steamin and grilling and frying caused a insignificant change in mineral content but effect of these three methods of cooking on the content of vitamin a and E in fish fillets yellowfin seabream (Acanthopagrus latus) was different.
    Beschreibung: Published
    Schlagwort(e): Acanthopagrus latus ; Yellowfin Seabream ; Acanthopagrus latus ; Methods of cooking fish ; Minerals ; Vitamin A ; Vitamin E ; Phosphorus ; Potassium ; Magnesium ; Calcium ; Zinc ; Copper
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.79-88
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  • 10
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    The study and measurement of some metals (lead, nickel, zinc, copper and iron) in muscle tissue shrimp (Metapenaeus affinis) in Hormozgan Province (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The objective of this study is to evaluate and compare the concentration of metals, lead, nickel, iron and copper in muscle tissue of White shrimp (Metapenaeus affinis) in three regions (Qeshm, Khamir port and Laft port) in Hormozgan Province. Sampling was conducted in summer and winter 1394. After the 180- captured biometric samples, muscle tissue was isolated. The preparation and analysis of samples was performed according to standard methods MOOPAM. The results indicated that the studied concentration in muscle tissue of White shrimp at sample locations showed significant difference statistically. In terms of concentration in the muscle tissue of White shrimp in the study area between summer and winter significant difference was observed, statistically (p〈0/05). As both in summer and winter concentrations of lead, nickel, iron and copper in muscle tissue of White shrimp in Qeshm is greater than the other two regions. The studied concentration in muscle tissue of White shrimp in Qeshm, Khamir port and Laft port international standards is less than the limit which indicates that the health of aquatic ecosystems contamination is not a problem.
    Beschreibung: Published
    Schlagwort(e): Metapenaeus affinis ; White shrimp ; Metalic elements ; Food chain ; Metals ; Lead ; Nickel ; Zinc ; Copper ; Iron ; Muscle ; Tissues
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.179-189
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  • 11
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    Possibility of trout farms efluent return to groundwater In non-agricultural seasons (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: This project is trying to investigate water contamination after use in ponds. For this aquaculture status, physical and chemical water properties, microbial pollutants and heavy metals levels in the some of trout ponds effluent in East Azerbaijan province were evaluated in 2007 to 2009. The information of groundwater and climate conditions in ten years, Drilling and wells piezometric Information, in local wells are reviewed.According to data obtained from analysis of water samples in the output pools range studied concentrations(term mg/l) some parameters are as follows:(BOD: 1.9-3.2),(COD: 3.4-34.1),(TSS: 26.6-42.7),(N-NO2:0.003-.136),(P-Po4:0.0170.067),(pH:7.75-8.28).Electrical conductivity(500 ±2 to 1129±144 term µm/cm) in the effluent ponds . Based on the results of we can say that between input and effluent ponds in the review of all factors as chlorine, sulfate, sodium, potassium, total nitrogen, soluble phosphorus, total phosphorus, calcium, total hardness, magnesium, alkalinity and silica significant changes not be observed. Review of water analysis data to some factors(such as:water temperature,EC,pH,NO2,CO2,HCO3,CO3,DO,COD,BOD) And compare this data with the authorities standard confirmed that the All factors mentioned in effluent is allowed now. In terms of microbial contamination and heavy metals ( Zn,Cu,Ca,Pb,Fe,Cr ) is no pollution. Appropriate strategies for removing suspended materials must to use.We can use Watershed Management solutions to inject output water to the underground table. Should be noted status change (eg change in flow rate, an unusual increase in temperature, fish density increasing, reducing food quality, lack of appropriate management actions and ...) may reduce the effluent quality and the ability of injection water underground to lose . In this case, measures must be for wastewater treatment and improve the quality ponder.
    Beschreibung: Iranian Fisheries Science Research Institute
    Beschreibung: Published
    Schlagwort(e): Physical ; Chemical ; Microbial ; Effluent Trout ; Return ; Ground Water ; Non-agricultural ; Aquaculture ; Pollutants ; Heavy metals ; Samples ; Chlorine ; Sulfate ; Sodium ; Potassium
    Repository-Name: AquaDocs
    Materialart: Report , Refereed
    Format: 88pp.
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  • 12
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    Measurement of some heavy metals concentration in live feed commonly used in aquaculture (2018)
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    Publikationsdatum: 2021-05-19
    Beschreibung: The aim of the current investigation was to determine the concentration of some heavy metals in a number of aquatic invertebraes commnly used as live feed in aquaculture. For this goal, samples of blood worm, sludge worm, earthworm, gammarus, shelled snail, freshwater ghost shrimp and tiny marine shrimp were prepared from aquatic environment or from imported live feeds. Samples were digested chemically and the atomic absorption were recorded as µg/g dry weight. Results showed that the highest level of heavy metals concentration were detected in live feeds as follows: iron (213.4±10.2), cadmium (1.15±0.013) and nickel (20.97±3.6) in earthworm; zinc (105.71±5.8), chrome (19.63±5.3) in sludge worm; copper (37.34±4.2) in freshwater ghost shrimp and lead (24.71±4.7) in tiny marine shrimp respectively. It is proposed that high rates of heavy metals detected in some of live feeds in the present study may eventually have a severe negative impact on fish and human health conditions. Therefore, it is suggested that upper limit concentration of these elements be defined as an import health standard for every permission of importation of live feeds.
    Beschreibung: Published
    Schlagwort(e): Blood worm ; Sludge worm ; Earth worm ; Heavy metals ; Aquatic invertebrates ; Live feed ; Aquaculture ; Measurement ; Freshwater ; Iron ; Cadmium ; Nickel ; Zinc ; Zinc ; Copper ; Lead
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.7-13
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  • 13
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    Effects of Zinc and Copper exposure on growth and survival of Artemia urmiana and Artemia franciscana (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The effects of exposure to Zinc and Copper in developing from nauplius to adult stages in two species, Artemia urmiana and A. franciscana were studied. The growth and lifespan of the specimens under treatments also have been investigated. During the period of the experiments, both species of Artemia were exposed by Zinc-treated groups (23, 68, 114 mg/l) and also copper-treated groups (13, 25, 38 mg/l) and compared with control group without any metal treatment. However, in treatments with Zinc and Copper concentrations, lifespan was reduced in comparison with that of the control treatments. Results showed that Zinc and Copper have toxic effects on A. urmiana and A. franciscana. Although the resistance of both of them was high, but A. urmiana was more endure than A. franciscana. It is suggested that the two Artemia species might have adopted a strategy to speed up growth and reproduce before metal pollution can cause death for them. Also, this study indicated that Zinc was less toxic than Copper for the two species investigated.
    Beschreibung: Published
    Schlagwort(e): Artemia franciscana ; Artemia urmiana ; Growth ; Zinc ; Survival ; Reproduction ; Toxicity ; Copper ; Toxicity tolerance ; Marine
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.123-132
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  • 14
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    The correlation of length and weight of Kutum (Rutilus frisii kutum) in the central south of Caspian Sea with copper and zinc concentration in muscle and liver tissues (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Concentration of copper (Cu) and zinc (Zn) in liver and muscle tissues of Kutum (Rutilus frisii kutum) of the Caspian Sea was assessed to study possible correlation of length and weight and the bioaccumulation of these heavy metals in the fish. Concentration of the metals in liver was higher than muscle (Zn: 55.2, Cu: 41.5kg/g) while the concentrations in the muscle tissue were lower than permissible limits proposed by FAO. Significant correlations were not detected between mean Zn and cu concentration and fish size. Finally, no significant difference was found in the concentration of the heavy metals in male and female fish specimens (P〉0.05).
    Beschreibung: Published
    Schlagwort(e): Correlation analysis ; Rutilus frisii ; Brackish ; Length-weight relationships ; Bioaccumulation ; Fish physiology ; Heavy metals ; Zinc ; Muscles ; Liver ; Copper ; Freshwater fish
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.121-128
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  • 15
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    The history of contamination in sediments from the Mersey Estuary. Development of a chronology for the contamination of the Mersey Estuary by heavy metals and organochlorines (2021)
    Environment Agency North West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11003 | 1256 | 2013-03-26 13:45:42 | 11003 | Environment Agency, UK (Freshwater Biological Association)
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    Publikationsdatum: 2021-06-26
    Beschreibung: This is the history of contamination in sediments from the Mersey Estuary: Development of a chronology for the contamination of the Mersey Estuary by heavy metals and organochlorines Report produced by the Environment Agency in 1998. This report looks at the history of industrial contamination of the Mersey and Ribble Estuaries back to the early part of the last century, many decades before the start of monitoring programmes providing a remarkably detailed picture of very complex changes. There is a clear record in the sediment of the contamination by each heavy metal (including: Cu, Cr, Hg, Pb, Zn) and organochlorine chemical (including DDT isomers and PCB congeners) studied. The results of the study clearly show the increases in levels of contamination as industry expanded early last century followed by various improvements as this century progressed. Each pollutant has its own idiosyncratic pattern of change with some improvements predating modern environmental concerns whilst other changes seem to relate directly to recent improvements in legislative control. Overall, for the pollutants studied, the results clearly demonstrate the magnitude of improvement that has been achieved in what was a very polluted area. The only major reservation to this story is that despite the wide range of substances covered, many other potentially important pollutants remain to be studied in a similar manner.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Fisheries ; Limnology ; Management ; England ; Mersey ; Ribble ; Inland waters ; Rivers ; Estuaries ; Heavy metals ; Lead ; Arsenic ; Chromium ; Copper ; Mercury ; Zinc ; Organochlorines ; HCB ; PCBs ; DDT ; Environmental Assessment ; Freshwater pollution ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 104
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  • 16
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    Fütterungsversuche an Regenbogenforellen (2021)
    In:  SF@ti.bund.de | http://aquaticcommons.org/id/eprint/12411 | 1240 | 2014-03-03 19:49:17 | 12411 | Johann Heinrich von Thünen-Institut, Bundesforschungsinstitut für Ländliche Räume, Wald und Fischerei
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    Publikationsdatum: 2021-06-30
    Beschreibung: “Institut für Küsten- und Binnenfischerei” was an independent Institute. Later, it was transferred to the „Institut für Seefischerei“.
    Schlagwort(e): Fisheries ; feeding experiments ; Aquaculture ; Salmo gairdnerii ; Rainbow Trout ; penicillin residues ; fish feeding ; Vitamin T ; growth
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    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 16-17
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  • 17
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    Computation, Analysis and Preparation of Coastwide Oyster Population Data - Survey of Oyster Population and Associated Organisms (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14201 | 9596 | 2020-08-31 20:32:13 | 14201 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Galveston Bay, Matagorda Bay, San Antonio Bay, Aransas Bay and South Bay areas were sampled at a total of nineteen stations to determine the population characteristics and fluctuations of oysters on the Texas coast. Population samples taken at monthly intervals from these stations showed heavy spat setting occurred in June 1962 and continued in moderation through December 1962. Survival of spat and seed class oysters ranged from moderate in Galveston Bay to excellent in the lower coastal bays. No extensive natural moralities were noted in any of the bay areas and the number of market-sized oysters increased in nearly all the bays. Dermocystidium marinum incidence maintained a high level, but no moralities were associated with the fungus. Oyster populations in Aransas Bay have recovered from the 1959 die-off and are once again approaching an overcrowded conditions for lack of harvesting. Artificial reefs, built in Aransas and Matagorda Bays, have been extremely successful and have attained the characteristics of natural oyster reefs.
    Schlagwort(e): Biology ; Fisheries ; oysters ; marine molluscs ; population dynamics ; oyster reefs ; artificial reefs ; growth ; mortality
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 18
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    Study of the Texas Bay Populations of Juvenile Shrimp, Penaeus aztecus, Penaeus setiferus, and Penaeus duorarum (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14185 | 9596 | 2020-08-31 20:28:08 | 14185 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Postlarvae were found entering Aransas Bay in appreciable numbers in the spring of 1963. Late post-larval and early juvenile stages of brown shrimp, Penaeus aztecus, were found in tertiary bays in April. White shrimp, P. setiferus were found in May and June. Brown shrimp grew about 0.8 mm per day, while white shrimp grew about 1.1 mm per day. The first wave appeared to be smaller than latter waves. Small brown shrimp were found moving through the inshore Gulf in large numbers in June and July. White shrimp reached a larger size in the bays in June and July. White shrimp reached a larger size in the bays and supported a large commercial bay fishery. Late fall waves of white shrimp left the bays at a smaller size (probably to escape low water temperatures). Preliminary data indicate the 1963 shrimp landings increased 25% over 1962 landings.
    Schlagwort(e): Ecology ; penaeid shrimp ; juveniles ; landing statistics ; white shrimp ; Penaeus setiferus ; brown shrimp ; Penaeus aztecus ; Penaeus duorarum ; growth
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 49
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  • 19
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    A study of commercial shrimp populations in coastal bays of Texas,1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14243 | 9596 | 2020-08-23 21:20:15 | 14243 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: In spring, the growth of brown shrimp, Penaeus aztecus, in Texas bays, including Galveston Bay, was delayed by cold water. Low salinity patterns of upper coastal bays confined the young to more saline lower regions of estuaries. The gulfward migration began in late May. By July most had left the bays. Heavy rainfall and runoff may have been beneficial to white shrimp, Penaeus setiferus. They were abundant in samples and over 12 million pounds were landed commercially.
    Schlagwort(e): Ecology ; penaeid shrimp ; temperature effects ; Penaeus aztecus ; salinity effects ; Penaeus setiferus ; growth ; estuaries ; population dynamics ; GBIC
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    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 20
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    Study of Sand Seatrout of the Galveston Bay Area (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14274 | 9596 | 2020-10-17 16:17:25 | 14274 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Sand seatrout (Cynoscion arenarius Ginsberg) were studied in the Galveston Bay area to provide information on seasonality, population composition, food items, growth, and spawning. Tagging efforts resulted in 518 tagged fish and a return of 16 tags during the 1968-70 period. Tag recovery data suggest a migration from the upper bay to the lower bay and Gulf waters in December and return in March. Electrophoretic analysis of multiple hemoglobin protein types were studied from 96 sand seatrout blood samples. Five protein types were observed without discernible differences that could be attributed to population heterogeneity. Analysis of stomach content revealed crustacea and fish as primary food items. Gonad development stages indicate a spawning period from March through August.
    Schlagwort(e): Ecology ; marine fish ; sand seatrout ; Cynoscion arenarius ; growth ; seasonality ; community composition ; food preferences ; spawning ; tagging ; stomach content ; migrations ; electrophoresis ; GBIC
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    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 21
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    Field application of anabolic steroids in carp seed production. Pt. 1. Rearing of fry to fingerling stage (2021)
    In:  http://aquaticcommons.org/id/eprint/16333 | 12051 | 2015-03-28 14:03:46 | 16333 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-03
    Beschreibung: Ethylestrenol (17β Hydroxy-17alpha-ethyl-estr-4-en-3-one) and Stanozolal (17β-Hydroxy-17alpha-methyl 1-5 alpha-androstano-(3,2-C)-pyrazole), both synthetic androgenic steroids, were fed via diet at 3ppm to the fry of catla, rohu and silver carp which were reared up to fingerling stage over a period of 167-172 days in earthen ponds. Ethylestrenol enhanced growth in silver carp and rohu but retarded growth in catla. Stanozolal depressed growth in all the 3 species. Length-weight relationship for these fry had been worked out and the relative condition factor in all the cases was very close to or slightly above 1.0.
    Beschreibung: Pt. 2. Rearing of spawn to fry stage. Journal of the Indian Fisheries Association, 27, pp. 27-35
    Schlagwort(e): Biology ; food conversion ; freshwater fishes ; anabolic steroids ; growth ; fingerlings ; Catla ; Silver carp ; Rohu
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 65-71
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  • 22
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    Effect of supplementary feed on the growth of shinghi (Heteropneustes fossilis Bloch) (2021)
    In:  http://aquaticcommons.org/id/eprint/16407 | 12051 | 2015-03-27 09:40:26 | 16407 | Bangladesh Fisheries Research Institute
    Details
    Publikationsdatum: 2021-07-04
    Beschreibung: Effect of two supplementary feed (food A and food B) on the growth of shinghi, Heteropneustes fossilis was observed for 3 months period during winter and summer. Food B containing rice bran 2 g, wheat bran 2 g and blood 10 ml, showed better growth. The net gain in length was 70.04 mm and in weight was 13.82 g. Total net production was observed as 254.00 g/m² with feed A and 345.50 g/m² with feed B.
    Schlagwort(e): Aquaculture ; diets ; growth ; artificial feeding ; fish culture ; Heteropneustes fossilis
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    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 205-207
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  • 23
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    Study of the Texas Shrimp Populations (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14245 | 9596 | 2020-08-21 20:55:52 | 14245 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: This report deals with the growth, seasonal abundance, and movement of brown shrimp, Penaeus aztecus, and white shrimp, Penaeus setiferus, in the coastal bays of Texas in 1965, including Galveston Bay. Young brown shrimp were abundant in the spring. Apparently, unfavorable bay conditions forced the young to enter the Gulf at an unusually small size. The fairly high brown shrimp population level in the estuaries after June 1 was indicative of a long emigration period and a strong year-class. White shrimp samples were small in the summer, but a large group was recruited to the population in the fall. The brown shrimp commercial catch in the spring (from major bays) increased 75% over 1964. White shrimp catches were small in August and September, but increased sharply in late fall. The total 1965 Texas shrimp landings, which nearly equaled the large 1960 catch, were over 48 million pounds, headless. Annual brown shrimp landings increased 31% from 1964, but white shrimp landings decreased 21%.
    Schlagwort(e): Ecology ; Fisheries ; penaeid shrimp ; white shrimp ; Penaeus setiferus ; brown shrimp ; Penaeus aztecus ; shrimp fisheries ; abundance ; seasonal variations ; growth ; migrations ; population dynamics ; landing statistics ; GBIC
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
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  • 24
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    Study of the Blue Crab in Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14252 | 9596 | 2020-08-31 20:10:25 | 14252 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Information on seasonal abundance, growth, movements and environmental relationships was used to study trends in the blue crab (Callinectes sapidus) population of Texas, while a survey of the commercial fishery was made to determine the size of the catch and market conditions.
    Schlagwort(e): Ecology ; Fisheries ; blue crab ; Callinectes sapidus ; abundance ; seasonal variations ; growth ; migrations ; crab fisheries ; GBIC
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    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 25
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    Study of the Southern Quahog (Mercenaria campechiensis Gmelin) in Texas Waters (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14253 | 9596 | 2020-08-23 20:15:42 | 14253 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Small groups of quahogs (Mercenaria campechiensis Gmelin) from a natural bed in West (Galveston) Bay were held in trays or boxes in Galveston Bay and the Lower Laguna Madre to study growth and mortality.
    Schlagwort(e): Ecology ; southern quahog ; Mercenaria campechiensis ; growth ; mortality ; predation ; stone crab ; Menippe mercenaria ; conch ; thais haemostoma ; Dermocystidium marinum ; fungal diseases ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 26
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    Study of the Texas Bay Populations of Juvenile Shrimp, Penaeus aztecus, Penaeus setiferus, and Penaeus duorarum - Study of the Texas Shrimp Population (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14276 | 9596 | 2020-08-31 20:11:37 | 14276 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Plankton samples from the Aransas Bay area indicated that the post larvae brown shrimp (Penaeus aztecus) immigration peak was reached in March. Sampling in the bays revealed the presence of a large wave of brown shrimp in the spring. In the shallow tertiary bays and along the shore of large bays brown shrimp grew slowly in April and movement to the open water of larger bays was delayed. As the waters warmed growth was rapid and the shrimp began their gulf ward movement on schedule. Samples taken in the inshore Gulf off the Lower Laguna Madre contained large numbers of brown shrimp in May. The samples from the Gulf off Port Aransas indicated that the majority of this species left the Aransas Bay area in June. Shrimp samples from the bays indicated the presence of a large 1964 white shrimp year class. This was confirmed by large commercial catches in the late summer and early fall. Small white shrimp were found in the Gulf in September off the lower coast. In January this species was found in abundance off Port Aransas, but not off Galveston. Brown shrimp commercial landings were somewhat disappointing, however, white shrimp landings were greater than landings reported in 1963.
    Schlagwort(e): Fisheries ; GBIC ; penaeid shrimp ; juveniles ; shrimp fisheries ; white shrimp ; brown shrimp ; pink shrimp ; population dynamics ; growth
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 45
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  • 27
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    Study of Oyster Growth and Population Structure of the Public Reefs in East Bay, Galveston Bay and Trinity Bay - Survey of Oyster Populations and Associated Organisms (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14202 | 9596 | 2020-08-31 20:32:23 | 14202 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: A moderate set of spat was observed throughout the bay in June and July. A light spat set also occurred in September and October on reefs in the middle and lower bay areas. The fall set was not found in upper Trinity Bay. The majority of the oysters were less than three years of age although remnant population of oysters over five years old were occasionally found. Some oysters reached legal size at two and one-half years of age but most of the market sized oysters were over three years old. The incidence of the fungus organism, Dermocystidium marinum, increased in late summer and early fall. As a result, moralities among the older oysters were expected to increase. However, no unusual moralities were noted by the end of the sample period. The 1961-62 oyster harvest was generally confined to Todd's Dump and Hanna's Reef. Oysters were good in quality but not exceptional. During the 1962-63 season oyster boats spread out and worked several reefs which had been unproductive in past years. Both the quality and quantity of oysters were better than in previous years.
    Schlagwort(e): Biology ; Fisheries ; oysters ; marine molluscs ; life history ; growth ; population dynamics ; oyster fisheries
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 23
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  • 28
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    Study of Texas Shrimp Populations, 1970 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14273 | 9596 | 2020-08-23 20:51:33 | 14273 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: In spring, samples were taken with bar-seines and trawls from Sabine Lake, Galveston Bay, Matagorda Bay, Aransas Bay, and the Lower Laguna Madre to study brown shrimp (Penaeus aztecus) growth, movements, seasonal abundance trends, and environmental needs. The shrimp was abundant in samples from Galveston Bay, Aransas Bay, and the Lower Laguna Madre. Slow growth of juveniles during April in upper coastal bays was attributed to low temperature. Many, however, were 70 to 80 mm long by late May, because growth accelerated as bays warmed.
    Schlagwort(e): Biology ; Fisheries ; GBIC ; penaeid shrimp ; brown shrimp ; Penaeus aztecus ; growth ; migrations ; abundance ; salinity ; shrimp fisheries
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 21
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  • 29
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    Study of the Juvenile Shrimp Populations of the Galveston Bay System - Study of the Texas Shrimp Populations (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14277 | 9596 | 2020-08-31 20:10:59 | 14277 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Penaeus aztecus, brown shrimp, arrived at the tertiary bays in early April, but grew slowly. In May growth accelerated and emigration from the bay began in June when the shrimp were less than 90 mm long. A second wave of brown shrimp arrived in August. White shrimp, P. setiferus, arrived at the tertiary bays in June. This group of shrimp was followed by two smaller groups in August and October. Brown shrimp were found in Sabine Lake in May. The 1964 white shrimp were found in mid-June. In the fall a second wave of white shrimp was observed. Commercial brown shrimp landings reached a peak in July and August, but fell sharply after September. White shrimp production was high.
    Schlagwort(e): Fisheries ; GBIC ; penaeid shrimp ; brown shrimp ; growth ; migrations ; juveniles ; white shrimp ; shrimp fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 41
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  • 30
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    Some aspects on growth and condition index of Saccostrea cucullata (Born), Cerithium rubus (Desh) and Tellina angulata Gmelin from Bombay coast (2021)
    In:  http://aquaticcommons.org/id/eprint/15922 | 12051 | 2015-01-16 08:44:18 | 15922 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-11
    Beschreibung: Size variation, growth, condition index and spawning periodicities of three species of molluscs were studied for a period of 15 months from a polluted and a relatively clean marine habitat near Bombay, Maharashtra, India. Growth of Saccostrea cucullata was 1.2 times and of Cerithium rubus was 1.6 times higher in unpolluted habitat than the polluted water. Spawning was during premonsoon in S. cucullata, post monsoon in C. rubus and monsoon in Tellina angulata. Condition index and percentage edibility values were higher at less polluted stations.
    Schlagwort(e): Biology ; condition factors ; pollution effects ; spawning ; marine molluscs ; growth ; Saccostrea cucullata ; marine ; Bombay ; Maharashtra ; India
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 21-29
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  • 31
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    The age and growth of catfish Rita rita (Ham.) from the River Yamuna in north India (2021)
    In:  http://aquaticcommons.org/id/eprint/15924 | 12051 | 2015-01-16 08:46:41 | 15924 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-11
    Beschreibung: The age of 224 fishes was determined by counting the translucent zone on the opercular bones and otoliths. Back calculated annual growth of the fish revealed that the absolute growth of the female was better than that of the male upto the third year. From the fourth year onwards the growth of the male exceeded the growth of the female.
    Schlagwort(e): Biology ; otolith reading ; osteology ; age determination ; growth ; Rita rita ; freshwater ; Yamuna river ; Northern India
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 37-41
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  • 32
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    Effect of different feeds on growth, survival and production of African catfish (Clarias gariepinus Burchell) (2021)
    In:  http://aquaticcommons.org/id/eprint/16454 | 12051 | 2015-03-27 09:08:58 | 16454 | Bangladesh Fisheries Research Institute
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    Publikationsdatum: 2021-07-05
    Beschreibung: An experiment was conducted to study the effect of different feeds on growth survival and production of African catfish (C. gariepinus) in six cemented tanks (3m² each) over a period of 120 days. Three different feeds namely Feed A (Saudi-Bangla fish feed, 33.43% protein), Feed B (formulated feed, 40.12% protein) and Feed C (chicken raw intestine, 59.58% protein) were applied to treatments I, II and III respectively. Each of the tanks was stocked with 24 fry with mean initial body weight of 2.56±0.06 g. Feeds were supplied to the fish ad-libitum daily in two instalments. Significantly highest weight gain was obtained in treatment III, however, survival rate was low compared to other treatments. The feed conversion ratio (FCR) values ranged from 2.52-6.4. Survival rate of fish varied between 83 and 96%. Treatment II yielded the highest (5000 kg/ha/120 days) production with the highest survival rate of fish. On the basis of survival rate and production, it is suggested that the formulated feed (Feed B) is suitable for the culture of C. gariepinus in cemented tanks.
    Schlagwort(e): Aquaculture ; Clarias gariepinus ; feed ; growth ; survival ; diets ; comparative studies ; feeding experiments ; food conversion ; fish culture
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 121-126
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  • 33
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    A simple approach for the estimation of food consumption from growth rates at different environmental conditions and its application to juvenile cod (Gadus morhua L.) of a fjordic sea loch on the west coast of Scotland (2021)
    In:  http://aquaticcommons.org/id/eprint/4615 | 1240 | 2012-11-14 18:56:25 | 4615 | Johann Heinrich von Thünen-Institut, Bundesforschungsinstitut für Ländliche Räume, Wald und Fischerei
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    Publikationsdatum: 2021-07-05
    Beschreibung: AbstractGrowth and condition of fish are functions of available food and environmental conditions. This led to the idea of using fish as a “consumption sensor” for the measurement of food intake over a defined period of time. A bio-physical model for the estimation of food consumption was developed based on the von Bertalanffy model. Whereas some of the input variables of the model, the initial and final lengths and masses of a fish and the temperature within the time period considered can easily be measured, internal characteristics of the species have to be determined indirectly. Three internal parameters are used in the model: the maintenance consumption at 0°C, the temperature dependence of this consumption and the food efficiency, the percentage of the ingested food utilized. Estimates of the parameters for a given species can be determined by feeding experiments. Here, data from published feeding experiments on juvenile cod, Gadus morhua L., were used to validate the model. The average of the relative error for the food intake predicted by the model for individual fish was about 24 %, indicating that fish used the food with different efficiencies. However, grouping the fish according to size classes and temperature lowered the relative error of the predicted food intake for the group to typically 5 %. For a group containing all fish of the feeding experiment the relative prediction error was about 2 %.ZusammenfassungWachstum und Kondition der Fische sind von der verfügbaren Nahrung und von Umweltbedingungen abhängig. Dies führte zur Idee, Fisch als „Konsum-Sensor“ für die Messung der Nahrungsaufnahme über einen definierten Zeitraum zu verwenden. Auf Grundlage des von Bertalanffy-Modells wurde ein bio-physikalisches Modell zur Schätzung der Futteraufnahme entwickelt. Während einige der Eingangsgrößen des Modells leicht gemessen werden können (Anfangs- und Endlänge und -körpermasse der Fische und die Temperatur innerhalb des betrachteten Zeitraum), können interne Parameter der betrachteten Art nur indirekt bestimmt werden. Drei interne Parameter werden in dem Modell verwendet: Die Erhaltungskonsumtion bei0° C, die Temperaturabhängigkeit dieser Rate und der Wirkungsgrad der Nahrung (der Anteil der Nahrung ,der aufgenommen und verwendet und nicht ungenutzt wieder ausgeschieden wird). Die Modellparameter für eine bestimmte Art können durch Fütterungsversuche bestimmt werden. Um das Modell zu validieren wurden Daten aus veröffentlichten Fütterungsversuchen mit juvenilen Kabeljau (Gadus morhua L.) verwendet. Modell und Wirklichkeit weichen in der Regel voneinander ab. Der durchschnittliche relative Fehler der durch das Modell vorhergesagten Nahrungsaufnahme betrug für Einzelfische etwa 24%, was darauf hinweist, dass einzelne Fisch die Nahrung mit unterschiedlichen Wirkungsgraden verwerten. Allerdings senkte die Gruppierung der Fische nach Größenklassen und Temperatur den relativen Vorhersagefehler für die Nahrungsaufnahme der Gruppe auf etwa 5%. Für alle Fische im Fütterungsversuch ist der relative Vorhersagefehler etwa 2%.
    Beschreibung: Johann Heinrich von Thünen-Institute, Federal Research Institute of Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung - Information on Fishery research in 2010
    Schlagwort(e): Education ; Fisheries ; Biology ; cod ; food consumption ; growth ; changes of conditions ; temperature ; von Bertalanffy model
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 49-61
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  • 34
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    Wachstum eingeschleppter Muschelarten in der Flensburger Förde (2021)
    In:  sf@vti.bund.de | http://aquaticcommons.org/id/eprint/5586 | 1240 | 2012-11-12 23:14:58 | 5586 | Bundesforschungsanstalt für Fischerei
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    Publikationsdatum: 2021-07-11
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Biology ; Fisheries ; introduced species ; mussel ; growth ; Baltic Sea
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 27-29
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  • 35
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    Zur Brutanfütterung von tropischen Nutzfischen (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/5617 | 1240 | 2012-11-12 23:09:52 | 5617 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-07-11
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Aquaculture ; tropical fish ; first feeding ; breeding ; feeding ; growth ; aquaculture ; Artemia ; Clarias lazera ; Silurus galiaeus
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 102-104
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    Metallothionein as an indicator of water quality: assessment of the bioavailability of cadmium, copper, mercury and zinc in aquatic animals at the cellular level (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5313 | 1256 | 2011-09-29 15:06:23 | 5313 | Freshwater Biological Association
    Details
    Publikationsdatum: 2021-07-09
    Beschreibung: The study of metallothioneins (MTs) has greatly improved our understanding of body burdens, metal storage and detoxification in aquatic organisms subjected to contamination by the toxic heavy metals, Cd, Cu, Hg and Zn. These studies have shown that in certain organisms MT status can be used to assess impact of these metals at the cellular level and, whilst validation is currently limited to a few examples, this stress response may be linked to higher levels of organisation, thus indicating its potential for environmental quality assessment. Molluscs, such as Mytilus spp., and several commonly occurring teleost species, are the most promising of the indicator species tested. Natural variability of MT levels caused by the organism's size, condition, age, position in the sexual cycle, temperature and various stressors, can lead to difficulties in interpretation of field data as a definitive response-indicator of metal contamination unless a critical appraisal of these variables is available. From laboratory and field studies these data are almost complete for teleost fish. Whilst for molluscs much of this information is lacking, when suitable controls are utilised and MT measurements are combined with observations of metal partitioning, current studies indicate that they are nevertheless a powerful tool in the interpretation of impact, and may prove useful in water quality assessment.
    Schlagwort(e): Environment ; Oceanography ; Pollution ; Water quality ; Cadmium ; Copper ; Mercury ; Zinc ; Aquatic animals ; Cytology ; Metallothioneins ; Environmental monitoring ; Indicators ; Scotland
    Repository-Name: AquaDocs
    Materialart: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 138-153
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    Zur Verwendung von Raps, Lupine und Ackerbohne im Forellenfutter (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/6113 | 1240 | 2012-11-14 14:32:21 | 6113 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-07-13
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Aquaculture ; aquaculture ; substitute feed ; rapeseeds ; lupine ; field pea ; trout food ; feeding experiments ; growth
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 30-31
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  • 38
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    Abwuchs von Channel Catfish bis zur marktfähigen Größe in der Außenstelle Ahrensburg (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/6131 | 1240 | 2012-11-14 14:39:07 | 6131 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-07-13
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Aquaculture ; aquaculture ; Ictalurus punctatus ; growth ; environmental influences ; feeding
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 64-65
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  • 39
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    Zur Qualität von Austern aus der Flensburger Förde (2021)
    In:  sf@vti.bund.de | http://aquaticcommons.org/id/eprint/6158 | 1240 | 2012-11-14 15:00:30 | 6158 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-07-13
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Biology ; Fisheries ; oyster ; product quality ; Crassostrea gigas ; temperature effect ; growth
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 142-143
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  • 40
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    Erprobung von Versuchs-Futtermischungen für Aalbrut (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/6178 | 1240 | 2012-11-14 14:40:24 | 6178 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-07-13
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Aquaculture ; feeding experiments ; eel ; breeding ; growth ; dry feed
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 186-187
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  • 41
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    Welches Futter für Tilapien? (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/6114 | 1240 | 2012-11-14 15:01:09 | 6114 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-07-13
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Aquaculture ; feeding experiments ; aquaculture ; intensive fish farming ; Tilapia mossambica ; Tilapia aurea ; Tilapia nilotica ; growth
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 31-32
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  • 42
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    Renken als Besatz in einem Baggersee (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/6914 | 1240 | 2011-11-01 12:02:19 | 6914 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Biology ; Fisheries ; stocking ; artificial lakes ; fish culture ; Coregonidae ; growth ; fish diseases
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 135-136
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  • 43
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    Meerforellenuntersuchungen an Schleswig-Holsteins Ostseeküste vorläufig abgeschlossen (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/7054 | 1240 | 2011-11-08 08:25:00 | 7054 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-06-29
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Biology ; Fisheries ; Seatrout survey ; migration ; spawning stock ; growth ; Smolt ; running waters
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 44-45
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  • 44
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    Fütterungstechnik bei der Käfighaltung von Forellen (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/7142 | 1240 | 2011-11-16 13:17:48 | 7142 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-06-30
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Aquaculture ; feeding techniques ; caging operations ; trout ; growth ; aquaculture ; fish farming
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 54
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  • 45
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    Japanische Austern wachsen auch in der Ostsee (2021)
    In:  sf@vti.bund.de | http://aquaticcommons.org/id/eprint/7180 | 1240 | 2011-11-17 13:04:09 | 7180 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-06-30
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Aquaculture ; oyster farming ; Baltic Sea ; Crassostrea gigas ; breeding apparatus ; growth ; experimental farming
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 167-168
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  • 46
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    Dorschmarkierungen in der Ostsee (2021)
    In:  osf@vti.bund.de | http://aquaticcommons.org/id/eprint/7274 | 1240 | 2011-11-30 12:00:07 | 7274 | Bundesforschungsanstalt für Fischerei
    Details
    Publikationsdatum: 2021-07-01
    Beschreibung: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Schlagwort(e): Biology ; Ecology ; Fisheries ; cod tagging ; tagging experiments ; Gadus morhua ; recapture ; migration ; growth ; stock monitoring ; fishing areas ; Baltic Sea
    Repository-Name: AquaDocs
    Materialart: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 131-134
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    Camarāo de profundidade: relatório dos cruzeiros realizados com o n/i "Ernst Haeckel" em Agosto-Setembro 1980, Novembro-Dezembro 1980, Janeiro-Fevereiro 1981, Janeiro-Fevereiro 1982 (2021)
    In:  http://aquaticcommons.org/id/eprint/17112 | 12051 | 2015-05-30 09:13:41 | 17112 | Instituto de Investigação Pesqueira, Mozambique
    Details
    Publikationsdatum: 2021-07-10
    Beschreibung: Reports of cruises carried out off Mozambique between parallels 21 degree 00 and 26 degree 20'S and at depths of 400 and 800 meters including abundance indices, catch composition, geographic and bathymetric distributions of shrimp catches are presented. The main species found were Hymenopenaeus triarthrus and Aristeomorpha foliacea which represent 64 to 72% of total catches.
    Schlagwort(e): Biology ; biomass ; yield ; cruise reports ; recruitment ; morphometry ; shrimp fisheries ; sexual maturity ; growth ; Aristeomorpha foliacea ; Mozambique
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-48
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  • 48
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    Reproduction, age and growth of the kelee shad, Hilsa kelee (Cuvier, 1829) (pisces: fam. Clupeidae) with informations on its fishery in Maputo Bay, Mozambique (2021)
    In:  http://aquaticcommons.org/id/eprint/17121 | 12051 | 2015-05-30 09:04:53 | 17121 | Instituto de Investigação Pesqueira, Mozambique
    Details
    Publikationsdatum: 2021-07-10
    Beschreibung: Age, growth and reproduction of H. kelee were studied, and a brief description of its fishery in Maputo Bay (Mozambique) is given. Most material was collected from gill net fisheries during 1977-1980, but some was taken from shrimp trawlers operating in the same area during 1980-1981. Main spawning takes place during October-January with a peak in December. There is also some evidence that spawning takes place during June-July. The size at first maturity was approximately equals 14-15 cm. Ageing was carried out using primary growth rings in the otoliths and length-frequency analysis of fish caught by shrimp trawlers. Von Bertalanffy's growth equation parameters were determined. Males and females grew in similar fashion. There are seasonal trends in the catch composition of the gill net fishery, showing high values during April to September and low during October to December.
    Schlagwort(e): Biology ; length-weight relationships ; spawning seasons ; otolith reading ; sexual reproduction ; sex ratio ; catch/effort ; sexual maturity ; growth ; Clupeidae ; Hilsa kelee ; Maputo Bay ; Mozambique
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 53-80
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    Length-weight relationship in the Asian seabass, Lates calcarifer (Bloch) under culture condition (2021)
    In:  http://aquaticcommons.org/id/eprint/16613 | 12051 | 2015-04-09 12:35:45 | 16613 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: Asian seabass, Lates calcarifer (Bloch) - a catadromous centropomid perch, is a good candidate species for brackishwater aquaculture in India. The length-weight relationship and the relative condition of L. calcarifer were assessed under culture condition. The length of the fish samples ranged from 25 to 240 mm and the relative condition (w sub(r)) of the fish for different length groups ranged from 99.54 to 104.39, indicating the good condition of the fish. The regression analysis of log-transformed length-weight data was carried out and the 'b' coefficient indicates the good condition of fish showing an isometric growth in the juvenile phase under culture condition.
    Schlagwort(e): Aquaculture ; marine fish ; length-weight relationships ; growth ; catadromous species ; brackishwater fish ; brackishwater aquaculture ; fish culture ; Dicentrarchus labrax ; Lates calcarifer ; Asian seabass
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 61-64
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    Growth parameters of Lepturacanthus savala (Cuvier, 1829) from Mumbai waters (2021)
    In:  http://aquaticcommons.org/id/eprint/16616 | 12051 | 2015-04-09 12:35:07 | 16616 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: Lepturacanthus savala (Cuvier, 1829) constitutes a minor fishery contributing 23.3% to the total ribbonfish catch in Maharashtra. Based on the length data obtained from shrimp trawlers and the traditionally operated bag nets, age and growth of the species have been investigated from Mumbai waters. Growth was studied by various computer-based methods incorporated in FiSAT Programme. The growth parameters L∞ and K (on annual basis) by Gulland-Holt plot were 683.3 mm and 0.87, respectively. As the seasonal temperature variations in coastal waters of Mumbai are not pronounced, the seasonally oscillating growth patterns by ELEFAN and Appledoorn's method were not considered. Following the von Bertalanffy growth model, the fish attains 399.8, 567.2 and 637.4 mm at the end of 1, 2 and 3 years, respectively, and the lifespan of the fish is about 3.3 years.
    Schlagwort(e): Biology ; length-weight relationships ; marine fish ; age ; growth ; fishery industry ; Lepturacanthus savala ; Mumbai ; Maharashtra ; India
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 81-89
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    Evaluation of some formulated diets for rearing the post-larvae of Macrobrachium rosenbergii (2021)
    In:  http://aquaticcommons.org/id/eprint/16620 | 12051 | 2015-04-09 12:34:11 | 16620 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: Macrobrachium rosenbergii post-larvae with an average weight of 6.26 ± 0.23 mg and an average length of 10.67 ± 0.13 mm were fed with one of the five experimental diets having graded levels of lipid (5.0, 7.5, 10.0, 12.5 and 15.0%) to satiation two times a day to study their effect on growth, survival and feed utilisation. The highest weight gain was observed in post-larvae fed 7.5% lipid, although there was no significant difference (p〉0.05) between groups fed 7.5 and 10.0% lipid. Similar effect was observed in the specific growth rate and protein efficiency ratio of post-larvae fed the diet with 7.5 and 10.0% lipid. The lowest feed conversion ratio was obtained in postlarvae fed the diet with 7.5% lipid. The survival rates of post-larvae fed on various levels of dietary lipid differed significantly (p〈0.05) after 15 days of rearing period. Significantly lower survival was observed in the diet with 15.0% lipid level. Dietary lipid did not significantly affect prawn carcass protein, lipid and ash contents. Based on the data analysis (ANOVA – one way analysis), the dietary lipid requirement for 15 days of nursery rearing of Macrobrachium rosenbergii post-larvae was estimated to be 7.5 to 10.0% under experimental conditions in this study.
    Schlagwort(e): Aquaculture ; diets ; nursery rearing ; juveniles ; growth ; lipids ; crustacean culture ; proteins ; survival ; marine crustaceans ; food conversion ; Macrobrachium rosenbergii ; post-larvae
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 113-119
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    The effect of feeding rate on the growth, food conversion and protein efficiency of silver dollar, Metynnis schreitmulleri (AHL), fry (2021)
    In:  http://aquaticcommons.org/id/eprint/16619 | 12051 | 2015-04-09 12:34:25 | 16619 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: A 30-day experiment was conducted to determine the effects of varying feeding rates on the growth of fry of silver dollar, Metynnis schreitmulleri (Ahl). Silver dollar fry with an average initial body weight of 1.100 ± 0.029 g were collected from a local fish breeder and fed a diet (35% protein and 6% fat) at the rate of 3, 6 and 9% of body weight per day in two equal meals. Per cent weight gain increased from 54.54 to 118.18 with increased feeding rates, which were significantly different (p〈0.05) from each other. The highest specific growth rate was obtained in the fry fed at 9% body weight per day. In another study for 30 days, the effects of feeding frequency on growth, feed conversion and protein efficiency of silver dollar fry were evaluated. Groups of silver dollar fry with an initial individual weight of 0.700 ± 0.019 g were offered feed continuously for 24 hours during the day or night at different time intervals with varying meal sizes. The night time feeding with two meals gave the lowest weight and length gains (0.985 g and 0.30 cm). The growth rates of fish fed during day with three equal-sized meals are significantly (p〈0.05) higher (4.66%) than the other treatments.
    Schlagwort(e): Aquaculture ; marine fish ; feeding ; growth ; proteins ; food conversion ; Metynnis schreitmulleri ; silver dollars
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 105-112
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    Ballenas francas australes: el lento camino de la recuperación (2021)
    In:  guillermoharris@speedy.com.ar | http://aquaticcommons.org/id/eprint/16720 | 9602 | 2016-05-04 14:39:12 | 16720 | Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
    Details
    Publikationsdatum: 2021-07-08
    Beschreibung: El riesgo de extinción de la ballena franca se debe principalmente a la caza indiscriminada de la que ha sido víctima hasta bien pasada la segunda mitad del siglo XX. Este artículo de divulgación científica da a conocer el estado actual de la evolución de la población a partir estudios realizados en una zona muy frecuentada por estos cetáceos, la Península Valdés (Prov. Chubut, Argentina). Se incluyen datos sobre el crecimiento de la población, mortandad, y señales que aún preocupan. Se referencian también otras lecturas sugeridas sobre la temática.
    Beschreibung: Reprinted as: pp.203-210 in, Ciencia del Mar. Volumen temático 1, 12/2014; Asociación Ciencia Hoy. ISBN: 978-987-45584-0-4 (Special issue dedicated to 'Marine Sciences: 1988-2014')
    Schlagwort(e): Biology ; Conservation ; Ecology ; Eubalaena australis ; PSW ; Argentina ; Patagonia ; Valdes Peninsula ; marine environment ; marine mammals ; nature conservation ; behaviour ; growth ; mortality ; population number ; aerial surveys ; protected resources
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 37-43
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  • 54
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    Pequenos peixes pelágicos (2021)
    In:  http://aquaticcommons.org/id/eprint/17131 | 12051 | 2015-05-30 09:33:32 | 17131 | Instituto de Investigação Pesqueira, Mozambique
    Details
    Publikationsdatum: 2021-07-10
    Beschreibung: The paper describes small pelagic fishes including several marine resources ranked among the most important in abundance(anchovy, horse mackerel and sardines) off the coast of Mozambique.
    Beschreibung: Paper presented at the Seminário conjunto Moçambique/Norad sobre os recursos marinhos de Moçambique, 12-15 de Junho de 1984
    Schlagwort(e): Fisheries ; pelagic fisheries ; population dynamics ; growth ; small pelagic fishes ; catch composition ; stock assessment ; Mozambique
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 76-94
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  • 55
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    Reproduction, age and growth of the round scad Decapterus macrosoma Blecker 1851, Carangidae from Mozambique (2021)
    In:  http://aquaticcommons.org/id/eprint/16938 | 12051 | 2015-05-16 09:43:31 | 16938 | Instituto de Investigação Pesqueira, Mozambique
    Details
    Publikationsdatum: 2021-07-09
    Beschreibung: Reproduction, age and growth of Decapterus macrosoma Blecker, 1851 were studied. The data were collected in Sofala Bank from commercial bottom trawlers and surveys. A total of 5,500 individuals were examined during the period 1979-1982. The species is caught in the same areas as D. russellii, but appears in lower quantities. Two main spawning periods a year, one in December-February and another one in June-September were found. Ageing was determined by counting daily growth rings in the otoliths. The parameters of von Bertalanffy's growth equation were L infinity=26 cm and K=0,6/year. Males and females seem to grow at the same rate.
    Schlagwort(e): Biology ; Decapterus macrosoma ; spawning seasons ; otolith reading ; sexual reproduction ; age determination ; stock assessment ; growth ; Mozambique
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-17
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    Seed production and culture techniques of Genetically Improved Farmed Tilapia (GIFT) in brackishwater environment (2021)
    In:  http://aquaticcommons.org/id/eprint/17974 | 9237 | 2015-09-18 19:12:02 | 17974 | Bangladesh Fisheries Research Institute
    Details
    Publikationsdatum: 2021-07-03
    Beschreibung: Effects of different levels of salinity on survival, growth and gonadal development of Genetically Improved Farmed Tilapia (GIFT) were studied under laboratory conditions in glass aquarium, for a period of ten weeks. The initial individual size of the GIFT was 20.23±4.45 and the salinity levels tested were 0, 5, 10, 15 and 20 ppt. The highest survival of 87.5% was found in 0 ppt and the lowest 60.5% in 20 ppt. Though the survival decreased progressively with increased salinity, there were no significant differences (P〉0.05) among 0, 5, and 10 ppt. Similar to what has been observed in survival, the specific growth rate (SGR %/day) also decreased as of 1.30, 1.24, 1.08, 0.90 and 0.71, respectively, with the increased salinity of 0, 5, 10, 15 and 20 ppt. The gonadal development was highest in 0 ppt with a GSI value of 3.75 and lowest of 2.01 in 20 ppt. In the second experiment, gonadal development and seed production performance of GIFT in brackishwater condition were investigated for a period of three months. Each of the three fine meshed hapas of 20 square meters made from nylon net was placed in a freshwater (0 ppt) and in a brackish water (10-15 ppt) pond of the Brackishwater Station (BS). GIFT of 65 g average weight from a single cohort were stocked into three hapas at a rate of 2 per m. The male vs female ratio was 1:3. The development of gonad was faster with the higher gonadosomatic index (GSI %) of 3.85 % in freshwater condition than that of 2.73 % in brackish water. Within three months of the study period, a total of 70,510 and 44,250 GIFT fry were produced respectively, in freshwater and brackishwater conditions. Finally under third experiment, a participatory on-farm trial was carried out to evaluate the production performance of GIFT in monoculture and in polyculture with silver barb in coastal freshwater pond conditions. Nine ponds were selected for three treatment combinations of GIFT monoculture (T1), GIFT and silver barb polyculture (T2), and silver barb monoculture (T3). The ponds have been stocked in April, 05 at a density of 25,000 fry per ha. Fishes were fed with rice bran at the rate of 6% bw per day. In one month culture period, GIFT attained an average weight of 16.27 g in monoculture and 17.23 g in polyculture, against an average stocking weight of 0.37 g. Silver barb reached an average weight of 16.62 g in polyculture with GIFT and 10.01 g in monoculture, against an average stocking weight of 3.79 g.
    Schlagwort(e): Aquaculture ; Biology ; Fisheries ; GIFT ; brackish water ; survival ; growth ; gonadal development
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    Materialart: article
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    Etude des polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans les moules (〈Perna perna〉) prélevées au niveau de la baie du Lévrier. (2006)
    Université de Nice Sophia Antipolis
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Mémoire de DEA
    Beschreibung: Ce travail a pour objectif de déterminer le niveau de contamination des produits halieutiques mauritaniens. Pour cela, nous avons étudié les polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans des moules (〈Perna perna〉) prélevées au niveau de la baie du Lévrier en Mauritanie sur une période de quatre mois (novembre 1998 à février 1999). Sur les 400 échantillons analysés les moyennes de concentrations trouvées restent faibles par rapports à celles trouvées dans d'autres zones peu polluées (Amiard et al. 1986b). Ce qui n'est pas le cas du cadmium qui présente des valeurs plus élevées, phénomène fréquemment rencontré le long de la côte ouest africaine (Sidoumou et al. 1992). Par ailleurs, dans cette présente étude il apparaît que les moules de petites tailles (inférieure à 8 cm) concentrent plus de métaux (Cu, Fe, Zn et Cd) que les grandes tailles (supérieures à 8 cm). Respectivement, pour la station Cabanon nous avons les concentrations suivantes en ltg.g-1 de poids sec (grande taille - petite taille): 4,89 - 5,57 ; 201,41 - 268,15 ; 58,99 - 72,23 ; 3,77 - 5,93. Aussi, les femelles accumulent beaucoup plus de métaux (Cu, Fe, Zn et Cd) que les mâles ; respectivement nous avons pour la station Comeca les concentrations suivantes en gg/g-1 de poids sec (mâle - femelle) : 1,99 - 3,6 ; 98,94 - 115,94 ; 40,67 - 41,99 ; 3,07 - 4,00. Les résultats obtenus nous permettent de conclure que la Baie du Lévrier peut être considérée comme zone non polluée. This work presents a study of metals traces (Cu, Fe, Zn, Cd and Hg) in mussel (〈Perna perna〉) taken in bay of the Bay Lévrier in Mauritania over one four months period (November 1998 at February 1999). On the 400 analyzed samples the averages of found concentrations remain weak by reports/ratios with those found in other zones (Atlantic Ocean) little polluted (Amiard and al 1986b). What is not the case of the cadmium which presents higher values, phenomenon frequently met along the Wests coast African (Sidoumou and al 1992). In addition, in this present study it appears that the mussel of small sizes (lower than 8 cm) concentrate more metals (Cu, Fe, Zn and Cd) that big sizes (higher than 8 cm) ; respectively for the Cabanon station we have the following concentrations in gg.g-1 of dry weight (big sizes - small sizes) : 4,89 - 5,57 ; 201,41 - 268,15 ; 58,99 - 72,23 ; 3,77 - 5,93. Also, the females accumulate much more metals (Cu, Fe, Zn and Cd) that males ; respectively we have for the Comeca station the following concentrations in gg/g-1 of dry weight (males - females) : 1,99 - 3,6 ; 98,94 - 115,94 ; 40,67 - 41,99 ; 3,07 - 4,00. The results obtained enable us to conclude that the Bay of the Lévrier can be regarded as not polluted zone.
    Beschreibung: IMROP
    Beschreibung: moule, Comeca, Cabanon, Cuivre, Fer, Mercure, Polluants chimiques
    Schlagwort(e): Copper ; Iron ; Environmental conditions ; Mercury ; Size ; Zinc ; Chemical analysis ; Copper ; Environmental conditions ; Iron ; Mercury ; Size ; Zinc
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    Anthropogenic and seasonal influence on the sediment-water fluxes for selected metals at Lake Naivasha, Kenya. (2015)
    Kenya Marine and Fisheries Research Institute | Mombasa, Kenya
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Lake Naivasha is a fresh water lake, situated in the Eastern Rift Valley of Kenya (00 45 S' and 360 20 E). The lake has no surface outlet and is perceived to be under anthropogenic stress. The lake being situated at the basin of the rift valley bares the burden of acting as a receptacle of waste from the town and the surrounding horticultural industry. To investigate the level of pollution due to bioavailable metals, benthic fluxes of selected metals were determined at sites near suspected pollution input sources. In situ benthic flux experiments were conducted at two sites, near the municipal outflow and at the papyrus field near the horticultural farms. Sediment samples from the exposed riparian land were collected during the dry season after the Lake had resided and selected metals fluxes determined in the laboratory under simulated conditions. Al in situ benthic flux at station SS (near the sewage input) was quite high it averaged 7 mmoles m2 h-I and was influenced significantly and positively by pH r=0.89. While Al in situ benthic flux at station SH (located in the papyrus field near horticultural farms) was I mmoles m-2 h-I. Copper Manganese and zinc in situ benthic fluxes were predominantly positive at station SS, however this was not the case at station SH (at papyrus field). The papyrus field at station SH plays an important role in the buffering of the lake in reference to the selected metals investigated, due to the precipitation of redox sensitive metals. Among the metals, analyzed manganese was mobilized the most during the rainy season, after the immediate flooding of the exposed riparian land.
    Beschreibung: ? draft of paper published as: Kamau, J.N., Gachanja, A, Ngila, J.C., and Kazungu J., Anthropogenic and seasonal influence on the sediment-water fluxes for selected metals at Lake Naivasha, Kenya. Lakes & Reservoirs: Research and Management ; 2008,13:145-154.
    Beschreibung: Unpublished
    Schlagwort(e): Heavy metals ; Copper ; Manganese ; Zinc ; Aluminium ; Sediments
    Repository-Name: AquaDocs
    Materialart: Report , Not Known
    Format: 30pp.
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    Heavy metals (Cd, Ni and Zn) concentrations in the edible muscle tissue of Pike perch (Esox lucius) from Anzali Wetland (2017)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Pike (Esox lucius) is a native species in Anzali Wetland and has been considered for its flesh. This study was carried out to compare the rate of accumulation and concentration of heavy metals such as cadmium, nickel and zinc in edible muscle tissue of pike at three stations (west, center and east) of Anzali wetland in 2012.Ten fishes were randomly caught by gillnet from different stations in standard weights. After removal of the tissue samples, for chemical digestion through mixed acid digestion (HNO3 / HClO4) was performed on samples. Heavy metal concentrations were measured using flame atomic absorption spectrophotometer. The average concentration of cadmium in pike in western station was 0.05 and in eastern and central part of wetland was 0.09 (μg/g dry weight), Mean concentrations of nickel metal in west, center and east, were 0.44, 0.37 and 0.22 (μg/g dry weight), Average concentrations of zinc in western, central and eastern part of wetland were 28, 25.55 and 13.55 (μg/g dry weight) respectively. In this study, concentrations of cadmium, nickel and zinc in edible muscle tissue of pike did not show significant differences between stations (P〉0.05). The cadmium, nickel and zinc standards in American Food and Drug Administration (FDA), World Health Organization (WHO) were compared. The results showed that toxicity of nickel in samples of central was near but in western part was more than the permissible limit compared with the standard WHO = 0.38, therefore consumption of this fish could be a warning of a threat to the health of these fish in vulnerable groups of society.
    Beschreibung: Published
    Schlagwort(e): Pike perch ; Esox lucius ; Heavy metals ; Muscle ; Tissue ; Nickel ; Cadmium ; Zinc
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.75-80
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    The benefits of fish and rice integrated culture in Iran (2018)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: Fish culture in rice field is an ancient activity in Asia and probably it has been a routine activity in China since decades ago. Countries are now gradually finding out the advantages of the activity putting more and more land under the integrated culture. The integrated culture was first conducted in 1983 in Iran. Since then, the activity has been extended in the rice fields of 11 provinces of the country. In an experimental project in 2003, 13 rice fields totally covering 8.2 hectares and 13 control fields with the same size, physical and chemical conditions were chosen to investigate the outcomes of the integrated culture. For this, 1400 specimens of juvenile fish each weighting on average 3545 grams and composed of 57% common cam, 29 % grass carp, 14% silver carp and big head carp were stocked per hectare of each field. The average weight for grass catty individuals was 25-35 grams. Feeding rate was based on the fish biomass. In harvesting time, characteristics of the rice were compared between experimental and control fields in order to determine the quality and quantity changes in the product. At the same time, usage of fertilizer, pesticides and herbicides were measured in both experimental and control fields. The pesticide usage in control fields was 15 kg per hectare, but in experimental fields it was only 5kg per hectare. This showed 66% reduction in pesticide use. In each control field, 2 liters of herbicides was used, as compared to only 0.3 liter per hectare in the experimental fields, showing an 85% percent reduction. The chemical fertilizer (urea, phosphate, potassium) used in the control fields was 169 kg per hectare, translating into a 23% reduction in each experimental field. Overall, rice production increased 302 kg per hectare in the control fields. In this experiment, the profit of fish and rice integrated farming was estimated to be 4,300,000 Rials (US$505). The results showed that enhancing fish and rice integrated farming might increase farmers' profits; while reducing the need to apply fertilizers and pesticides.
    Beschreibung: Published
    Schlagwort(e): Carp ; Rice ; Fish culture ; Integrated culture ; Urea ; Phosphate ; Potassium
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.97-108
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    Population Studies of the Blue Crabs of the Galveston Bay System - Studies of Blue Crab Populations of the Texas Coast (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14204 | 9596 | 2020-08-31 20:32:49 | 14204 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Trawls, seines, and trammel nets were used to sample the Galveston Bay crab populations. The data collected were used in determining the seasonal abundance of the crabs as compared to previous years' sampling. Blue crab populations in 1962 appeared to be larger than in 1961. The female population lagged behind the male in abundance in all months in 1962 except April, October, and December. The movement of adult crabs appeared to be governed by their search for food, reproductive cycle, and seasonal temperatures. Juveniles remained in the bay all seasons, moving toward the primary bay as they grew. Growth rate of the juvenile crabs was 0.4mm per day.
    Schlagwort(e): Fisheries ; Oceanography ; blue crab ; marine crustaceans ; population dynamics ; abundance ; growth ; life history
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 11
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    Survey of Shrimp populations in the Inshore Gulf of Mexico off Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14250 | 9596 | 2020-08-31 20:09:49 | 14250 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: In 1965 shrimp and associated bottom organisms were sampled for type, abundance, size groups, and seasonal availability with a 23-25 foot flat otter trawl in the Gulf of Mexico off Port Aransas, Port Mansfield, Port Isabel, and briefly off Galveston, Texas. In regular weekly samples, commercial shrimp of four species, non-commercial shrimp of 7 species, two species of squid, and various associated animals were caught in 100 trawl samples. Brown shrimp, Penaeus aztecus, were the most abundant of the commercial species, followed by white shrimp, Penaeus setiferus, and pink shrimp, Penaeus duorarum. Trachypeneus similis and Squilla empusa were the most abundant non-commercial species. This survey indicates the seasonality of Gulf shrimp populations and the cyclic growth and migration patterns in inshore waters. Periods of abundance are noted for all shrimp. Growth cycle information is given for brown, white, and pink shrimp. Any variation of catch between areas sampled is noted, and data on non-commercial species area included for more comprehensive understanding of the ecology of the inshore Gulf of Mexico.
    Schlagwort(e): Ecology ; Fisheries ; penaeid shrimp ; pink shrimp ; white shrimp ; brown shrimp ; biological sampling ; Trachypenaeus similis ; Squilla empusa ; seasonality ; growth ; commercial species ; GBIC
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    Materialart: book_section
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    Effect of dietary protein level on the growth of Deccan mahseer fry Tor khudree Sykes (2021)
    In:  http://aquaticcommons.org/id/eprint/15963 | 12051 | 2015-01-16 09:47:09 | 15963 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-11
    Beschreibung: Four feeds having different protein levels were separately tested on Tor khudree fry having an average length of 23.5 mm and weight 55 mg. The best average growth of 15.66 mg and 0.456 mm/day was obtained with Feed IV which comprised rice bran, ground nut oil cake, Acetes, wheat flour and mineral mix at the ratio of 1:1:1:0.7143:0.01428. These constitute 35.29% of proteins. The Feed II which comprised R.B + G.O.C. + prawn shell + wheat flour and mineral mix at a ratio of 1:1:1:0.7143:0.01428 contained 32.61% crude proteins. It provided a growth rate of 14.83 mg and 0.440 mm per day. The conversion rates were 38.258 and 37.776 for feeds IV and II respectively. Since Feed II is cheaper than Feed IV and provides almost equal growth rate, it can be used in the nurseries for intensive rearing of T. khudree fry.
    Schlagwort(e): Aquaculture ; Biology ; artificial feeding ; diets ; fry ; proteins ; rearing ; growth ; Tor khudree ; freshwater ; India
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 135-140
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    The free and combined amino acid contents in species of Caulerpa from southeast coast of India (2021)
    In:  http://aquaticcommons.org/id/eprint/16192 | 12051 | 2015-02-10 07:58:54 | 16192 | Society of Fisheries Technologists, India
    Details
    Publikationsdatum: 2021-06-30
    Beschreibung: Caulerpa racemosa var. macrophysa, C. racemosa var cornyphora and C. scalpelliformis are analyzed by quantitative paper chromatographic technique for their amino acid contents in proteins, peptides and free state. It is found that no appreciable variation occurs in the quality of amino acid make up in these algae; but quantitative differences are apparent in them. Moreover, both qualitative and quantitative variations occur in the amino acid make up of the peptides, and in the free state. The results are compared with those of the other investigations.
    Schlagwort(e): Biology ; Chemistry ; amino acids ; chemical composition ; growth ; amino acid composition ; Caulerpa racemosa ; Caulerpa macrophysa ; Caulerpa cornyphora ; Caulerpa scalpelliformis ; marine ; India
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 187-192
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    Pearl culture and pearl oyster cultivation (2021)
    In:  http://aquaticcommons.org/id/eprint/16228 | 12051 | 2015-02-13 08:45:26 | 16228 | Society of Fisheries Technologists, India
    Details
    Publikationsdatum: 2021-07-01
    Beschreibung: Few marine animals have yet been tamed and harnessed for man's use. Of these the bivalves have the greatest potential, and of the bivalves the pearl oysters are perhaps the most thoroughly exploited. Not only are they eaten and their shell put to use, but their nacre secreting properties are tapped to produce pearls by design, rather than by accident as in nature.
    Schlagwort(e): Aquaculture ; Pinctada ; pearl oysters ; pearl culture ; freshwater molluscs ; growth
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 50-52
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    Study of Commercial Shrimps in Coastal Bays of Texas - Study of the Texas Shrimp Populations (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14255 | 9596 | 2020-08-31 20:12:44 | 14255 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: In spring many brown shrimp, Penaeus aztecus, nursery grounds in Texas were adversely affected when fresh water inflow lowered salinities, Brown shrimp abundance trends were relatively high in Aransas, and Corpus Christi Bays, but low in other bays. White shrimp, P. setiferus, were scarce in summer. In fall they were abundant in Sabine Lake and Galveston Bay. Commercial brown shrimp production was high; white shrimp production was low. Total production (43.1 million pounds, headless) decreased 4.6 million pounds from 1965. Factors which influence brown shrimp survival, growth, and average size are discussed.
    Schlagwort(e): Ecology ; Fisheries ; penaeid shrimp ; brown shrimp ; white shrimp ; survival ; growth ; size ; salinity ; nursery grounds ; GBIC
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    Materialart: book_section
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    Biochemical composition of the muscle of some freshwater fishes during the pre-maturity phase (2021)
    In:  http://aquaticcommons.org/id/eprint/16215 | 12051 | 2015-02-12 15:17:22 | 16215 | Society of Fisheries Technologists, India
    Details
    Publikationsdatum: 2021-07-01
    Beschreibung: Biochemical composition of the muscle of juveniles belonging to 18 different species of freshwater fishes showed that the protein percentage in juveniles was higher than the adults. The fat, on the other hand, was much lower. This suggests that the body fat increases with the onset of maturity. No clear inverse relationship was found between fat and protein in juveniles. Moisture percentage was very high in juveniles. This was probably because of low fat content. In most species the sum of fat and water contents (F + W) was found to be constant. The percentages of ash, calcium and phosphorus were higher in juveniles than those of adults. Dry matter percentage varied inversely with the moisture and in most species carbohydrate was generally low. In juveniles although the calorific value of protein-fraction was high the total calorific value was lower than the adults.
    Schlagwort(e): Biology ; Chemistry ; biochemical composition ; muscle ; freshwater fishes ; growth
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 94-102
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    Culture of pearl in freshwater mussels (Lamellidens marginalis Lamarck) (2021)
    In:  http://aquaticcommons.org/id/eprint/16443 | 12051 | 2015-03-27 09:07:14 | 16443 | Bangladesh Fisheries Research Institute
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: A pond trail on pearl culture in freshwater mussels, Lamellidens marginalis was carried out for one year in an artificial perennial pond. Four types of foreign particles of indigenous sources, sand, stone, fish eyeball and beads of artificial pearl nucleus were used as nucleus for pearl production. Among the nuclei inserted mussel highest survival rate (72%) was recorded for stone and lowest survival rate (50%) for artificial pearl by nucleus implantation. Highest pearl production rate (%) was recorded for the insertion of stone and lowest for the sand. All nuclei inserted mussel produced pearl accept the mussel which was inserted beads of pearl nucleus for pearl formation. Growth rate (length and weight) was found higher for uninserted mussel than nuclei inserted mussels.
    Schlagwort(e): Aquaculture ; Lamellidens marginalis ; pearl culture ; pond culture ; growth ; freshwater molluscs
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 57-61
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    Estudio biológico pesquero del langostino de Mar del Plata en conexión con la operación nivel medio. (2021)
    Servicio de Hidrografía Naval | Buenos Aires
    In:  http://aquaticcommons.org/id/eprint/16468 | 125 | 2015-03-27 14:05:49 | 16468 | Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, Argentina
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: 135pp. & figures
    Schlagwort(e): Biology ; Fisheries ; Mar Argentino ; Argentina ; langostino ; Pleoticus muelleri ; Hymenopenaeus mulleri ; fishery biology ; shrimp fisheries ; fishery economics ; growth ; age ; reproduction ; catches ; geographical distribution ; commercial fishing
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 135
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    Field application of anabolic steroids in carp seed production. II. Rearing of spawn to fry stage. (2021)
    In:  http://aquaticcommons.org/id/eprint/16560 | 12051 | 2015-04-08 19:00:15 | 16560 | Indian Fisheries Association
    Details
    Publikationsdatum: 2021-07-06
    Beschreibung: Two synthetic androgenic steroids, Ethylestrenol (17 β - Hydroxy - 17 α ethyl - estr - 4 - en - 3 - one) and Stanozolal (17 β - Hydroxy- 17 α - methyl - 5 a - androstano - 3, 2 - C - pyrazole) were fed via diet at 3 ppm to the spawn of Rohu and Mrigal which were reared up to fry stage over a period of 15 days in earthen carp nurseries. Both hormones enhanced growth of spawn. A maximum of 25.78% increase in length and 25.69% increase in weight as compared to the controls has been recorded. Growth rate was recorded to be 0.8 mm & 2.48 mg/day (control), and 1.13 mm & 2.67 mg/day (Stanozolol treated) in case of Mrigal spawn; and 0.91 mm & 2.39 mg/day (control), 1.12 mm & 2.90 mg/day (Ethylestrenol treated), and 1.10 mm & 2.57 mg/day (Stanozolol treated) in case of Rohu spawn. A decrease in the values of Relative Condition Factor upon hormone administration was also noticed.
    Beschreibung: Pt. 1. Rearing of fry to fingerling stage. Journal of the Indian Fisheries Association, 23, pp. 65-71.
    Schlagwort(e): Biology ; hormones ; anabolic steroids ; growth ; carp nursery ; induced breeding
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    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 27-35
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    Heavy metals and arsenic in water, bottom sediments and Black Sea turbot (Scophthalmus maeoticus, Pall., 1814) in the Caucasian Shelf area in the Black Sea (1995–2020) (2022)
    Details
    Publikationsdatum: 2022-04-02
    Beschreibung: The results of investigation of the pollution of the water and bottom sediments of the Caucasian Shelf in the Black Sea by heavy metals (copper, zinc, lead, cadmium, mercury) and arsenic, as well as their content in the Black Sea turbot Scophthalmus maeoticus (Pallas, 1814) are presented for 1995–2020. In the water and turbot, the determination of Zn, Cu, Pb, As, and Cd has been conducted using the method of atomic absorption with electrothermal atomization; mercury in all components of the ecosystems was measured using the method of atomic absorption with “cold steam”; in the bottom sediments, the content of Zn, Cu, Pb and As was identified using X-ray fluorescence method. In 1995–2020, in some water samples, the concentrations of zinc, copper and mercury exceeded the maximum permissible level established for the water bodies of fisheries importance, while the lead and cadmium were below it. The arsenic content during the entire observation period was extremely low. A noticeable decrease in the concentrations of zinc, lead and copper in the shelf waters of the Black Sea in the present period as compared with the years of the greatest pollution (1995–2002) was recorded. In the bottom sediments, the content of lead, zinc and mercury exceeded their content in the earth's crust for several years; for arsenic, the excess was recorded throughout the entire observation period. This mostly results from the peculiarities of the granulometric composition of the shelf bottom and, to a much lesser extent, from anthropogenic influence. The differences in the bioaccumulation of heavy metals and arsenic in the organs of the Black Sea turbot are shown. Out of the identified elements, only lead, mercury and arsenic in isolated cases exceeded the permissible level in the organs of the turbot in some years.
    Beschreibung: Представлены результаты исследований загрязнения тяжелыми металлами (медь, цинк, свинец, кадмий, ртуть) и мышьяком воды и донных отложений Кавказского шельфа Черного моря и собственно черноморского калкана Scophthalmus maeoticus (Pallas, 1814) в период с 1995 по 2020 г. В воде и калкане определение Zn, Cu, Pb, As и Cd проводили методом атомной абсорбции с электротермической атомизацией; ртути во всех элементах экосистемы — методом атомной абсорбции в «холодном паре»; Zn, Cu, Pb и As в донных отложениях — рентгенфлуоресцентным методом. В отдельных пробах воды концентрации цинка, меди и ртути превышали предельно допустимую концентрацию для рыбохозяйственных водоемов, в то время как концентрации свинца и кадмия — нет. Содержание мышьяка в течение всего периода наблюдений оставалось крайне низким. Было отмечено заметное снижение концентраций цинка, свинца и меди в воде шельфа Черного моря в современный период по сравнению с периодом наибольшего загрязнения (1995–2002 гг.). В донных осадках содержание свинца, цинка и ртути в течение ряда лет превышало содержание в земной коре; для мышьяка превышение наблюдалось в течение всего периода наблюдений. Очевидно, что данная ситуация в большей степени связана с особенностями гранулометрического состава дна шельфа, чем с антропогенным влиянием. Показаны различия в биоаккумуляции тяжелых металлов и мышьяка органами черноморского калкана. Из перечня определяемых элементов превышение допустимого уровня в органах калкана отмечалось в отдельные годы в единичных случаях для свинца, ртути и мышьяка.
    Beschreibung: Published
    Beschreibung: Refereed
    Schlagwort(e): Scophthalmus maeoticus ; Mercury ; Copper ; Zinc ; Arsenic ; Cadmium ; Maximum permissible level ; Bottom sediments ; Калкан ; Тяжелые металлы ; Накопление ; Донные отложения ; ASFA_2015::H::Heavy metals ; ASFA_2015::M::Marine pollution ; ASFA_2015::S::Sediment pollution
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    Materialart: Journal Contribution
    Format: pp.68-88
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    The marine biogeochemistry of zinc isotopes (2007)
    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 2007
    Beschreibung: Zinc (Zn) stable isotopes can record information about important oceanographic processes. This thesis presents data on Zn isotopes in anthropogenic materials, hydrothermal fluids and minerals, cultured marine phytoplankton, natural plankton, and seawater. By measuring Zn isotopes in a diverse array of marine samples, we hope to understand how Zn isotopes are fractionated in the oceans and how Zn isotopes may be used as tracers of marine biogeochemical processes. Common forms of anthropogenic Zn had δ66Zn from +0.08‰ to +0.32‰, a range similar to Zn ores and terrigenous materials. Larger variations were discovered in hydrothermal fluids and minerals, with hydrothermal fluids ranging in δ66Zn from 0.02‰ to +0.93‰, and chimney minerals ranging from -0.09‰ to +1.17‰. Lower-temperature vent systems had higher δ66Zn values, suggesting that precipitation of isotopically light Zn sulfides drives much of the Zn isotope fractionation in hydrothermal systems. In cultured diatoms, a relationship was discovered between Zn transport by either high-affinity or low-affinity uptake pathways, and the magnitude of Zn isotope fractionation. We established isotope effects of δ66Zn = -0.2‰ for high-affinity uptake and δ66Zn = -0.8‰ for low-affinity uptake. This work is the first to describe the molecular basis for biological fractionation of transition metals. Biological fractionation of Zn isotopes under natural conditions was investigated by measuring Zn isotopes in plankton collected in the Peru Upwelling Region and around the world. Seawater dissolved Zn isotopes also reflect the chemical and biological cycling of Zn. The δ66Zn of deep seawater in the North Pacific and North Atlantic is about 0.5‰, and the dissolved δ66Zn gets lighter in the upper water column. This is unexpected based our observations of a biological preference for uptake of light Zn isotopes, and suggests that Zn transport to deep waters may occur by Zn adsorption to sinking particles rather than as primary biological Zn. The thesis, by presenting data on several important aspects of Zn isotope cycling in the oceans, lays the groundwork for further use of Zn isotopes as a marine biogeochemical tracer.
    Beschreibung: This research was funded by NSF Research Grants OCE-0002273 and OCE-0326689, the Martin Family Society Fellowship for Sustainability, the Woods Hole Ocean Ventures Fund, and Arunas and Pam Chesonis through an MIT Earth Systems Initiative Ignition Grant.
    Schlagwort(e): Zinc ; Isotopes ; Biogeochemical cycles ; Atlantis (Ship : 1996-) Cruise AT11-2
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    Materialart: Thesis
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    Changes in micronutrient supply to the surface Southern Ocean (Atlantic sector) across the glacial termination (2011)
    American Geophysical Union
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 12 (2011): Q09007, doi:10.1029/2011GC003691.
    Beschreibung: Major deepwater masses upwell and reach the surface in the Southern Ocean, forming an important conduit supplying nutrients and micronutrients to the surface and playing a key role in the regulation of global climate through ocean-atmosphere gas exchange. Here, we reconstruct changes in micronutrient distribution in this region in response to past changes in upwelling, oceanic mixing, and sea-ice seasonality. We present two downcore (Zn/Si)opal records from the Scotia Sea and Drake Passage region, which we interpret in the context of micronutrient distribution in the Atlantic sector of the Southern Ocean over the last glacial termination. Previous work shows that micronutrient availability in the surface waters in the South Atlantic appear to be controlled dominantly by upwelling and mixing of micronutrient rich deepwaters, which are additionally fuelled by the terrestrial sediment sources of the Scotia Arc and South Georgia. This is supported by our reconstructions, which show micronutrient availability to the west of the Scotia Arc and South Georgia are consistently lower than to the east over the last glacial termination due to downstream transport and mixing into surface waters of continentally derived material in the Antarctic Circumpolar Current. Micronutrient availability in this region was at a minimum from 20 to 25 ky BP, coinciding with maximum sea-ice coverage, and increased due to an expansion of the seasonal sea-ice zone and increased mixing of subsurface waters. Our findings are consistent with largely diminished upwelling of micronutrients during the maximum glacial extent, and reduced mixing due to the presence of persistent sea-ice. During the deglacial there was an increase in micronutrient availability, as well as other nutrients and inorganic carbon, within the Antarctic Circumpolar Current as a result of an increase in deep oceanic upwelling, mixing and strengthened zonal transport.
    Beschreibung: This work was funded by NERC/S/A/2004/12390 and the Antarctic Funding Initiative grant AFI4–02.
    Schlagwort(e): Deglaciation ; Diatom opal ; Westerlies ; Zinc
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
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    The cobalt cycle in the Tropical Pacific Ocean (2017)
    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2017
    Beschreibung: Although over a dozen elements are needed to support phytoplankton growth, only a few are considered to be growth-limiting. As the central atom in vitamin B12, cobalt is crucial for metabolism, but its status as a limiting nutrient is uncertain. This thesis investigates the geochemical controls on oceanic cobalt scarcity and their biological consequences. Analysis of over 1000 samples collected in the Tropical Pacific Ocean reveals a dissolved cobalt distribution that is strongly coupled to dissolved oxygen, with peak concentrations where oxygen is lowest. Large cobalt plumes within anoxic waters are maintained by three processes: 1) a cobalt supply from organic matter remineralization, 2) an amplified sedimentary source from oxygen-depleted coastlines, and 3) low-oxygen inhibition of manganese oxidation, which scavenges cobalt from the water column. Rates of scavenging are calculated from a global synthesis of recent GEOTRACES data and agree with cobalt accumulation rates in pelagic sediments. Because both sources and sinks are tied to the extent of oxygen minimum zones, oceanic cobalt inventories are likely dynamic on the span of decades. Despite extremely low cobalt in the South Pacific gyre, the cyanobacterium Prochlorococcus thrives. Minimum cobalt and iron requirements of a Prochlorococcus strain isolated from the Equatorial Pacific are quantified. Cobalt quotas are related to demand for ribonucleotide reductase and methionine synthase enzymes, which catalyze critical steps in DNA and protein biosynthesis, respectively. Compared to other cyanobacteria, a streamlined metal physiology makes Prochlorococcus susceptible to competitive inhibition of cobalt uptake by low levels of zinc. Although phytoplankton in the Equatorial Pacific are subject to chronic iron-limitation, widespread cobalt scarcity and vulnerability to zinc inhibition observed in culture imply that wild Prochlorococcus are not far from a cobalt-limitation threshold.
    Beschreibung: I am lucky to have benefitted from major financial support of the Saito Lab by the National Science Foundation and the Gordon and Betty Moore Foundation. Specifically, National Science Foundation grants for the Center for Microbial Oceanography Research and Education (CMORE, DBI-0424599), GEOTRACES Pacific and Artic projects (OCE-1233261 and OCE- 1540254), and OCE-1220484 funded my thesis work. National Science Foundation grants OCE- 1031271 and OCE-1337780 and Gordon and Betty Moore Foundation grants 3782 and 3934 to the Saito lab also provided instrumentation and funded field expeditions that enabled this work.
    Schlagwort(e): Cobalt ; Zinc ; Plankton ; Kilo Moana (Ship) Cruise KM1128
    Repository-Name: Woods Hole Open Access Server
    Materialart: Thesis
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    Dissolved zinc in the subarctic North Pacific and Bering Sea : its distribution, speciation, and importance to primary producers (2012)
    American Geophysical Union
    Details
    Publikationsdatum: 2022-05-25
    Beschreibung: Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 26 (2012): GB2015, doi:10.1029/2010GB004004.
    Beschreibung: The eastern subarctic North Pacific, an area of high nutrients and low chlorophyll, has been studied with respect to the potential for iron to control primary production. The geochemistry of zinc, a critical micronutrient for diatoms, is less well characterized. Total zinc concentrations and zinc speciation were measured in near-surface waters on transects across the subarctic North Pacific and across the Bering Sea. Total dissolved zinc concentrations in the near-surface ranged from 0.10 nmol L−1 to 1.15 nmol L−1 with lowest concentrations in the eastern portions of both the North Pacific and Bering Sea. Dissolved zinc speciation was dominated by complexation to strong organic ligands whose concentration ranged from 1.1 to 3.6 nmol L−1 with conditional stability constants (K′ZnL/Zn′) ranging from 109.3 to 1011.0. The importance of zinc to primary producers was evaluated by comparison to phytoplankton pigment concentrations and by performing a shipboard incubation. Zinc concentrations were positively correlated with two pigments that are characteristic of diatoms. At one station in the North Pacific, the addition of 0.75 nmol L−1 zinc resulted in a doubling of chlorophyll after 4 days.
    Beschreibung: This research was supported by NSF grant OCE-0136835 and by an EPA STAR Fellowship.
    Beschreibung: 2012-11-12
    Schlagwort(e): North ; Pacific ; Diatoms ; Speciation ; Zinc
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
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    What are the latest developments in marine hatchery? (2021)
    In:  library@seafdec.org.ph | http://aquaticcommons.org/id/eprint/19965 | 2002 | 2016-02-24 21:57:59 | 19965 | Southeast Asian Fisheries Development Center, Aquaculture Department
    Details
    Publikationsdatum: 2021-07-06
    Schlagwort(e): Aquaculture ; Chanos chanos ; Epinephelus ; Lates calcarifer ; Lutjanus argentimaculatus ; Siganus ; ISEW ; Philippines ; brackishwater environment ; marine environment ; aquaculture development ; breeding ; cage culture ; economic feasibility ; feed ; feeding ; fish larvae ; fry ; growth ; hatcheries ; hormones ; induced breeding ; marine aquaculture ; marine fish ; nutritional requirements ; pond culture ; spawning
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: pp. 22-24, 54-55
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    A comparative study on some biological parameters in broodstock and juvenile kutum, Rutilus kutum in the southern Caspian Sea basin (2021)
    In:  http://aquaticcommons.org/id/eprint/21715 | 18721 | 2017-11-28 08:32:58 | 21715 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publikationsdatum: 2021-06-29
    Beschreibung: Some biological characteristics of broodstock and juvenile kutum, Rutilus kutum. were investigated using data collected from the estuaries of Tajen and Shirood Rivers (TR and SR) (south Caspian Sea basin) as well as from the Caspian Sea in 2012. The results showed higher condition factors (CF) in the male broodstocks than those estimated in the female broodstock of both TR and SR. The female juveniles displayed a greater level of CF. The Von Bertalanffy's growth equations were calculated as: Lt = 40.67(1 – e−2.27(t−18.84)) and Lt = 50.11(1 – e−0.48(t+1.814)) for the broodstocks of SR and TR, respectively, and for the juveniles as: [Lt = 48.36 (1 – e−0.537 (t+ 0.913]. The males of SR presented a negative allometric growth pattern.The females and males of both SR and TR presented similar isometric growth patterns. Both male and female juveniles from TR exhibited a positive allometric growth pattern. The calculated equations for total length and weight were as: W = 3E−06 L3.2069 and W = 5E−07 L3.4745 for the male broodstock of SR and TR, respectively, and as: W = 5E−07 L3.4745 for the juveniles. The measured parameters may reflect the role of fish habitat characteristics such as food availability, population density, and age classes depending on sex and season.
    Schlagwort(e): Biology ; Fisheries ; comparative ; biological ; parameters ; broodstock ; juvenile ; kutum ; Rutilus kutum ; Caspian Sea ; iran ; weight ; growth ; length
    Repository-Name: AquaDocs
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    Format: application/pdf
    Format: 205-213
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    Age determination and morphology of otolith in Alburnus chalcoides (Guldenstaedt, 1772) in the southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21742 | 18721 | 2017-11-30 03:27:22 | 21742 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publikationsdatum: 2021-06-30
    Beschreibung: The aim of this study was to provide necessary information on the age, growth and sex ratio of one of commercially important cyprinid species, Alburnus chalcoides in the southern Caspian Sea (North of Iran) from 2010 through 2011. 53 specimens of both sexes (males and females) were collected monthly. The samples were transported to the laboratory for further biological measurements and otolith extraction. The maximum and minimum age of A. chalcoides was 4+(FL=26.0 cm) and 1+ (FL= 18.1 cm), respectively. The mean fork length of A. chalcoides was 20.21±0.287 cm; and the sex ratio was 1.00: 2.12. The calculated length-weight relationships for all individuals were as W=0.141TL2.199 (R2= 0.648). Different regressions were prepared between age and morphological measurements of fish and otolith, of which the highest correlation was between age and body length as a linear regression of TL=1.959Age+16.32 (r= 0.66). There was no significant correlation between morphometric measurements of otolith and fish morphological parameters (p〉 0.05), and an allometric growth was found with a slope of b=1.926 for the study area.
    Schlagwort(e): Biology ; Fisheries ; age ; determination ; morphology ; otolith ; Alburnus chalcoides ; Caspian Sea ; Iran ; sex ; growth ; morphometric
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    Effect of dietary estradiol-17β on growth performance, body composition and blood indices in Stellate sturgeon, Acipenser stellatus (2021)
    In:  http://aquaticcommons.org/id/eprint/21744 | 18721 | 2017-11-30 03:34:44 | 21744 | University of Guilan, Faculty of Natural Resources, Iran
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    Publikationsdatum: 2021-06-30
    Beschreibung: This study was investigated the effects of dietary estradiol-17β (E2) on growth, body composition and blood indices in Acipenser stellatus. Fish (40.9 ± 1.1 g average initial weight; n = 60 per group) were fed with three different diets containing 0 (control), 25 and 50 mg kg-1 dietary estradiol contents to apparent satiation for seven months. The results suggested that growth rate were decreased as the E2 level was increased. No significant difference was observed in condition factor among dietary treatments. The highest survival rate was observed in fish fed control diet, but was not significantly different among the treatments (P〉0.05). Body composition did not show significant changes among dietary treatments. Number of white blood cells and red blood cells, hemoglobin and hematocrit values were significantly decreased as the E2 levels were raised (P〈0.05). Plasma biochemical parameters including glucose, total protein, cholesterol, triglyceride, calcium, and phosphorus levels were dose dependent with the lowest levels in control with the highest levels in fish treated with 50 mg E2. The results of the present study revealed growth suppression of dietary E2 and changes of blood indices with providing some basic information on the effect of estrogen hormone on physiology of sturgeon.
    Schlagwort(e): Aquaculture ; Biology ; Chemistry ; Fisheries ; dietary ; estradiol-17β ; growth ; performance ; body composition ; blood ; Stellate sturgeon ; Acipenser stellatus ; iran
    Repository-Name: AquaDocs
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    Format: application/pdf
    Format: 245-251
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    The probiotic effects of dietary inactive yeast Saccharomyces cerevisiae var. ellipsoideus on growth factors, survival, body composition and intestinal microbiota of Beluga juvenile (Huso huso) (2021)
    In:  http://aquaticcommons.org/id/eprint/21807 | 18721 | 2018-01-10 15:03:53 | 21807 | Iranian Fisheries Science Research Institute
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    Publikationsdatum: 2021-07-02
    Beschreibung: The probiotic effects of inactive yeast, Saccharomyces cerevisiae var. ellipsoideus was studied on growth performance, survival and intestinal microbiota of beluga juveniles (Huso huso). The study was done in complete randomize design that included feeding of beluga juveniles with diets supplemented with 0 (control), 1, 2 and 5% yeast (4 treatments with 3 replicates). Beluga juveniles (11.40±0.56g) were randomly allocated in 12 oval tanks at a density of 35 fish per tank and triplicate group were fed with experimental diets. At the end of the trial, growth factors (final weight, weight gain, SGR, CF) as well as feed conversion ratio (FCR), body composition (protein, lipid, ash, moisture) and intestinal microbiota (total viable bacteria and Lactobacillus spp. levels) were determined. Our results confirmed that juveniles fed on diet supplemented with 5% S. cerevisiae var. ellipsoideus had significantly higher final weight, weight gain, specific growth rate (SGR) and lower food conversion ratio compared to control and 1% treatment (P〈0.05). However, there were no significant differences between SGR of 5 and 2% yeast treatments (P〉0.05). The study of body composition showed no significant difference between treatments (P〉0.05). Total viable bacteria and Lactobacillus spp. count were significantly higher in 5% treatment compared to control (P〈0.05). However, there was no significant difference between Lactobacillus spp. levels in 5 and 2% treatments (P〉0.05).
    Schlagwort(e): Biology ; Fisheries ; Feeding ; Intestinal microbiota ; Beluga ; Saccharomyces cerevisiae ; growth ; survival ; body composition ; Iran ; juvenile ; Huso huso
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    Format: application/pdf
    Format: 55-66
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    Effect of garlic extract on growth and survival rate in Litopenaeus vannami post larvae (2021)
    In:  http://aquaticcommons.org/id/eprint/21878 | 18721 | 2018-01-15 09:23:51 | 21878 | Iranian Fisheries Science Research Institute
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    Publikationsdatum: 2021-07-03
    Beschreibung: The effect of garlic extract on growth and survival rates of one day larvae of Litopenaeus vannamei shrimp was tested for 12 days .Six nutritional treatments each with three replicates were fed to shrimp larvae (average weight 0.0013g) including control treatment (unriched Artemia nauplii) and second to sixth Artemia nauplii enriched with 200, 400, 600, 800 and 1000mg garlic extract per kg, respectively. The one way ANOVA results showed that all treatments were different in terms of average weight and total length of larvae compared to control group. Shrimps being fed by Artesia enriched with 200mg garlic extract per kg food have the best growth, survival rates and length (0.0062mg, 81.6% and 10.6mm). Group 3 with concentration of 400mg garlic extract per kg of feed followed by control group showed better growth and survival rates in shrimp larvae than other treatments but the lowest survival rate evaluated in shrimps fed by Artemia nauplii enriched with 600, 800 and 1000mg garlic extract per kg feed, orderly. Specific growth rates (SGR) for treatment groups 2 and 3 were higher compared to other groups.
    Schlagwort(e): Aquaculture ; Biology ; Medicinal plants ; Aquaculture ; Nutrition ; Shrimp ; growth ; survival ; Litopenaeus vannamei ; larval ; Iran
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    Format: application/pdf
    Format: 39-46
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    Goldstrip sardine (Sardinella gibossa) and poultry by-product protein hydrolysate effects on amino acid composition, growth and alevines survival of rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/21868 | 18721 | 2018-01-15 06:52:45 | 21868 | Iranian Fisheries Science Research Institute
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    Publikationsdatum: 2021-07-03
    Beschreibung: Effects of Goldstrip sardine (Sardinella gibossa) and poultry by-product protein hydrolysate on amino acid composition, growth and alevines survival of rainbow trout (Oncorhynchus mykiss) were investigated. Two hydrolyzed protein sources were incorporated into six diets for start-feeding rainbow trout (Oncorhynchus mykiss) alevines, in 3 different replacing levels (10%, 25% and 50%) of fish meal. Goldstrip sardine protein hydrolysate (SPH) and poultry by-product protein hydrolysate (PPH) were used, respectively. To compare the results, we used the same diet without protein hydrolysate. The diet with 25% SPH and 10% PPH offered the best results in terms of growth, survival, protein efficiency ratio, protein productive value and condition factor. Alevines fed with 25% SPH and 10% PPH showed more balanced amino acid composition in their body. By enhancing the protein hydrolysate in the diet, free amino acid composition in the diet and fish body was enhanced. The protein hydrolysate enhancement showed negative correlation with growth factors. Also, non essential amino acid composition of the body composition showed positive correlation with the lipid/protein percentage of the alevines. We conclude that an optimum level of protein hydrolysate can improve growth and performance of the rainbow trout alevines. However, excess protein hydrolysate can cause imbalanced amino acid composition in fish body and reduces the growth and survival factors. Based on this study, the optimum replacement of fish meal by SPH and PPH in rainbow trout alevines’s diet is 25% and 10%, respectively.
    Schlagwort(e): Aquaculture ; Feeding ; Fish meal ; Aquaculture ; Ration ; Sardinella gibossa ; Oncorhynchus mykiss ; amino acid ; composition ; growth ; survival ; Iran
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    Format: 81-96
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    Apparent lipid and fatty acid digestion, retention of lipid and growth performance in Caspian salmon (Salmo trutta caspius) fry fed dietary n-3 highly unsaturated fatty acids and vitamin E (2021)
    In:  http://aquaticcommons.org/id/eprint/21965 | 18721 | 2018-01-18 09:46:13 | 21965 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: A 10-week feeding experiment was conducted to investigate the effect of dietary n-3 highly unsaturated fatty acids (n-3 HUFA) and vitamin E interaction on growth, apparent digestibility, apparent retention and utilization of lipid in Caspian salmon fry. Six experimental diets combining three different dietary levels of n-3 HUFAs (L: low: 1+0.5, DHA+EPA, M: medium 2+1, DHA+EPA, H: high 4+2 DHA +EPA g/100g diet) with two different levels of vitamin E (L: low 300 and H: high 1000 mg/kg diet): LL, LH, ML, MH, HL and HH (HUFA/vitamin E) were investigated. Fry with initial mean (±SD) body weight of 600 ± 25 (mg) were randomly distributed in tanks and fed to apparent satiation. Increase in dietary HUFA and vitamin E markedly improved larval growth. The results showed that the survival of Caspian salmon fry was not affected by dietary omega-3 HUFA and vitamin E. C20:5n-3 and C22:6n-3 fatty acids content of polar and neutral lipids positively correlated with their concentration on diets. Apparent digestibility and apparent retention of total lipid was significantly affected by dietary HUFA. The results showed that n-3 highly unsaturated fatty acids and vitamin E had positive effects on growth performance, lipid metabolism and apparent digestibility of Caspian salmon fry.
    Schlagwort(e): Biology ; Fisheries ; Caspian salmon ; Highly unsaturated fatty acids ; Lipid ; digestibility ; Vitamin E ; Salmo trutta caspius ; dietary ; fed ; growth ; performance ; Iran
    Repository-Name: AquaDocs
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    Format: application/pdf
    Format: 74-90
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  • 84
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    Microbial and biochemical characteristics of fermented fish sausage from common carp (Cyprinus carpio) mince by application of Pediococcus pentasaceus at different incubation temperatures (2021)
    In:  http://aquaticcommons.org/id/eprint/21949 | 18721 | 2018-01-18 09:32:14 | 21949 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: Fermented sausage is a favorite kind of meat-product that has allocated great proportions of meat consumption in the world. For the first time in Iran in this study the production of Fermented sausage from minced meat of common carp was assessed by means of lactic acid bacteria at different incubating temperatures as 15, 25, and 35˚C. To prepare the fish sausage, common carp mince was grounded and mixed with NaCl (3%), glucose (3%) and lactic acid bacteria at 5 log CFU/g and afterward were incubated for 48 h. During the incubation of fish sausage, microbiological tests, moisture and protein content, and TVB-N were measured. According to the results, the higher temperature of 35˚C stimulated the rapid growth of lactic acid bacteria, resulting in a rapid decline in pH, and consequently suppressed the growth of pseudomonas, Micrococcaceae and Enterobacteriacea.
    Schlagwort(e): Biology ; Fisheries ; fish sausage ; common carp ; lactic acid bacteria ; fermentation ; Microbial ; biochemical ; Cyprinus carpio ; application ; Pediococcus pentasaceus ; temperature ; Enterobacteriacea ; Micrococcaceae ; Pseudomonas ; growth ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 35-46
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  • 85
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    Unbekannt
    The effects of phytoestrogens Matricaria recutita on growth, maturation of oocytes in the three spot gourami (Trichogaster trichopterus) (2021)
    In:  http://aquaticcommons.org/id/eprint/21995 | 18721 | 2018-01-21 11:52:56 | 21995 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-06
    Beschreibung: Chamomile is a rich source of phytoestrogens; these compounds have antioxidant, anticancer. In this study, the effects of chamomile on growing oocytes in immature female gourami fish were examined. Thus 60 immature female gourami fish with an average weight of 2-3 g of 6-treated group were analyzed. Treatments in a completely randomized experimental design with a dose of chamomile (10-20-30-50 mg/kg fish) along with control (no injection) and ethanol control (solvent injection) and with three replicates were tested. The fish adaptation to the environment lasted 3 days. The extract injections were done for 20 days, in 10 periods, every other day. In order to histological study, three days after end of the experiment, the ovarian tissue was removed and weighed, tissue processing and staining steps done with hematoxylin- eosin. At last the histological structure of the ovaries and the average percentage of treated fish gonadal indices were compared with the control group. According to our results of gonadal index, there was no significant difference between the control groups with receiving Ethanol (p〉0.05). Histological results showed that increasing the dose of chamomile extract accelerate oocyte maturation in three spot gourami. This is the fourth treatment (dose, mg / kg 50) to show its obvious. The difference between oocyte diameter was observed with increasing doses of Chamomile and in comparison with the control group, the difference was significant (p 〈0.05). Histological results showed that increasing the dose of Chamomile accelerate oocyte maturation in three spot gourami.
    Schlagwort(e): Aquaculture ; Biology ; Matricaria recutita ; Trichogaster trichopterus ; Gonadal index ; phytoestrogen ; growth ; three spot gourami ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 85-94
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  • 86
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    Changes of growth, food intake and plasma cortisol in juvenile common carp (Cyprinus carpio) following cortisol injection (2021)
    In:  http://aquaticcommons.org/id/eprint/22048 | 18721 | 2018-01-25 08:41:43 | 22048 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: The present study conducted to investigate the effect of cortisol injection on growth indices, food intake and plasma cortisol in juvenile common carp (Cyprinus carpio). After 2 weeks adaptation, 240 fish with 19.5 ± 0.2 g average weight were randomly distributed in to 12 fiberglass tanks with four treatments and three replicates (20 fish per tank). Based on body weight, cortisol (mixed with oil) was injected to treatments with different dosages at 0 (C0), 1 (C1) and 10 (C10) µg/g. At the end of 21 days, fish were weighed and growth parameters showed significant reduction in C10. No significant change was observed in hepatosomatic index among different treatments. Food intake were recorded daily during the experiment and showed significant reduction in days 1 to 8, 16 and 19 in C10 compared to control group . Blood was taken to determine plasma cortisol at the start, day 3, day 7 and day 21 of the experiment. Cortisol concentrations showed significant reduction in C10 compared to C0 group three days after the initiation of the experiment. The results showed that increasing of cortisol in a short time after injection, affected by changes of blood plasma cortisol and reduction of food intake could negatively have an effect on growth.
    Schlagwort(e): Aquaculture ; Biology ; Chemistry ; Cortisol ; Stress ; Appetite ; Liver ; Common carp ; Cyprinus carpio ; plasma ; food ; growth ; juvenile ; blood ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-12
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  • 87
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    Effect of herbal supplement of sangrovit on growth, blood biochemical parameters, survival and resistance to salinity stress of Cyprinus carpio fingerlings (2021)
    In:  http://aquaticcommons.org/id/eprint/22064 | 18721 | 2018-02-01 08:51:49 | 22064 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: This study was conducted to investigate the effects of different levels of sangrovit (0, 0.05, 0.1 and 0.15 %) on growth, some of blood biochemical parameters, survival and salinity tolerance capacity in Cyprinus carpio (2.62±0.117 gr). After 45 days of feeding, results showed that growth performance including of weight gain and % specific growth rate improved which fish fed whit sangrovit compared with to control group, but there was no significant differences in growth parameters which fish fed with herbal supplement compared to control group (P〉0.05). There were significant differences in biochemical parameters in fish fed with sangrovit compared to the control group (P〈0.05). The lowest level of cholesterol was observed in 0.05 % group and the highest level of total protein was observed in 0.15 % group. The highest levels of glucose observed in control treatment. In order to determine the effect of the herbal supplement on resistance to salinity stress, salinity stress was carried out after 45 days of feeding. Blood samples were obtained at 24, 72, 120 and 168 hours after stress. Hematocrit had significant difference in each groups (P〈0.05). On the third day after stress, hematocrit levels were decreased in all treatments. Survival and tolerance to salinity stress challenge remained unaffected by dietary supplementation of sangrovit. The results of this study showed that addition of sangrovit to fish diet can improve growth performance and blood biochemical parameters of common carp fingerlings.
    Schlagwort(e): Aquaculture ; Chemistry ; Growth ; performance ; Blood ; Sangrovit ; Stress ; Common carp ; Cyprinus carpio ; fingerlings ; biochemical ; parameters ; survival ; resistance ; growth ; fish ; fed ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 13-22
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  • 88
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    The effect of density and stocking weight on growth rate and production of grey mullet (Mugil cephalus L.) (2021)
    In:  http://aquaticcommons.org/id/eprint/22065 | 18721 | 2018-02-01 08:53:53 | 22065 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: Around ten thousands fries of Striped grey mullet (Mugil cephalus) with average weight and length of 280 mg and 28.3 mm respectively, imported in March 2008 from Egypt. The wild fries collected from surrounding natural waters of Alexandria. They stocked in four earthen ponds (each with 2500 m2 ) located at the Gomishan shrimp educational centre at late march in 2008. At the first year of culture the densities were 5000 and 10000 individuals per hectare and each treatment with two replicates. At second year, densities changed with 2000 and 2500 individuals per hectares and each of the treatments divided fishes with average primary weights of 80 and 115 grams. They fed twice a day at 8 AM and 2 PM and the amount was 5-7 percents of the fish existent biomass in each ponds. After seven months culture period, the average weight and length of fish in treatment 5000 ind./hec. were 113.7 gr and 21.1 cm respectively and in treatment 10000 ind./hec. the average weight and length were 86.6 gr and 19.6 cm respectively. At first year the average survival rate in different treatments was 77 percent. The average FCR in treatments 5000 and 10000 ind./hec. were 3.4 and 3.9 respectively. At second years after six months culture the average weights in pond no. 9 (with primary weight 115 gr and density 2000 ind./hec) , pond no. 10 (with primary weight 80 gr and density 2000 ind./hec) , pond no. 11 (with primary weight 115 gr and density 2500 ind./hec) and pond no. 12 (with primary weight 80 gr and density 2500 ind./hec) calculated as 476.6 ,338.1, 366.5 and 440 gr respectively. The average survival rate and FCR were 93 % and 3.1 respectively.
    Schlagwort(e): Aquaculture ; Grey mullet ; cultivation ; density ; stocking weight ; growth ; production ; Mugil cephalus L. ; weight ; length ; survival ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 23-34
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  • 89
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    Study of fish meal substitution with earthworm in diet of rainbow trout (Oncorhynchus mykiss) (2021)
    In:  http://aquaticcommons.org/id/eprint/22067 | 18721 | 2018-02-01 09:03:23 | 22067 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: This experiment was carried out to evaluate the effect of earthworm (Eisenia fetida) in diet for rainbow trout in a complete randomized design with 5 treatments in triplicates using 15 cages in a pound for 8 weeks. Ten fish with average weight 120 g was stocked in each replication. The earthworm (as fed) at the levels of 0, 25, 50, 75 and 100% was replaced with fish meal in rainbow trout diet. Results showed that feed intake decreased significantly (P 〈 0.05) as earthworm increased. The diets contain 25% and 50% earthworm showed no significant differences compared to control for weight gain, specific growth rate and feed conversion ratio (P 〉 b0.05). The chemical composition analysis of fish meat showed that there were no significant effects between control and 25% and 50% earthworm in diet for dry matter, crude protein and ash, but fat content significantly decreased as earthworm increased (P 〈 0.05). This present study showed that the earthworm (Eisenia fetida) can be used in rainbow trout diet up to 50% instead of fish meal.
    Schlagwort(e): Aquaculture ; earthworm ; fish meal ; rainbow trout ; growth ; body ; chemichal ; composition ; Oncorhynchus mykiss ; substitution ; diet ; Eisenia fetida ; earthworm ; levels ; protein ; feed ; growth ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 59-68
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  • 90
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    Effect of short term starvation and re-feeding on some growth, feeding factors and body composition Blue Streak Hap (Labidochromis caeruleus) (2021)
    In:  http://aquaticcommons.org/id/eprint/22126 | 18721 | 2018-02-12 11:05:21 | 22126 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: In this study, the effects of starvation and re-feeding on growth performance and body biochemical composition of Blue Streak Hap (Labidochromis caeruleus) were conducted at autumn 2014. A total of 450 fish were assigned to 5 treatments with 3 replicates. 15 tanks were prepared with a volume of approximately 120 liters and trial period was considered 48 days in experimental conditions. Treatments included 0, 2, 4, 8 and 16 days of starvation. Fish after two weeks of acclimatization to the laboratory conditions, were examined based on the pattern of starvation and re-feeding. The results of the growth performance and biochemical composition showed that, treatments 2 and 4 days of starvation, compared to the control group were able to compensatory growth in the period of re-feeding and did not show a significant difference in any of the treatments (P〉 0/05). But treatments 8 and 16 days of starvation not be able to compensate growth and expenditure of excess metabolic energy due to starvation period, and had significant differences in the growth and nutritional factors as well as significant differences in the lipid and protein level compared to the control group.
    Schlagwort(e): Aquaculture ; Biology ; Starvation ; Re-feeding ; Blue Streak Hap ; Labidochromis caeruleus ; growth ; feeding ; body composition ; protein level ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 197-202
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  • 91
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    Effect of commercial food replacement with earthworm (Eisenia foetida) on growth, survival, the number of larvae and their resistance to salinity stress in swordtail fish (Xiphophorus helleri) (2021)
    In:  http://aquaticcommons.org/id/eprint/22147 | 18721 | 2018-02-15 15:02:06 | 22147 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: In this study, the effect of commercial food replacement with earthworm (Eisenia foetida) on growth, survival, the number of larvae and their resistance to larval salinity stress in Swordtail fish (Xiphophorus helleri) was investigated. A completely randomized design experiment comprising of four treatments: T1 (100% commercial food), T2 (25% Earth worm +75% Commercial food), T3 (50% Earth worm + 50% commercial food), T4 (75% Earth worm + 25% Commercial food) were performed in triplicate. Swordtail fish were fed with 3% of its weight, 3 times per day. After a 60-day experimental feeding period, growth factors and survival rate of fish fed with different diet treatments were not affected. However, the growth factors and survival rate were affected by sex and the weight gain, specific growth rate and survival rate of females was significantly higher than males. The highest number of born larvae was observed in T2 which was significantly more than control. (P〈0.05). In T4, larvae showed the lowest resistance to salinity stress test (P〈0.05). Results showed that number of born larvae significantly increased in 25% replacement than control, so the Swordtail fish could be fed with low levels (25%) of earthworm without any unfavorable effects on the growth and survival rate and their larval resistance to salinity stress test.
    Schlagwort(e): Aquaculture ; Biology ; Earth worm ; Swordtail fish ; Salinity stress ; Larvae ; Xiphophorus helleri ; Eisenia foetida ; survival ; growth ; food ; resistance ; Iran
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 231-242
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  • 92
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    A study on growth parameters, blood factors and proximate composition of rainbow trout (Oncorhynchus mykiss) cultured in underground brackish and freshwater (2021)
    In:  http://aquaticcommons.org/id/eprint/22650 | 18721 | 2018-05-08 22:27:14 | 22650 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-08
    Beschreibung: In this research, growth rate, blood parameters and proximate composition of rainbow trout (Oncorhynchus mykiss) cultured in brackish and freshwater were evaluated. Two treatments (brackish and freshwater) in 3 replications were investigated. Six 1.5 m³ fiberglass tanks were used for this experiment, containing 180 rainbow trout specimens with average weight of 47.2±0.1g. Feeding rate in treatments was about 3% of body weight based on water temperature and fish biomass. Total length and weight of fish were measured in 15 days intervals. After 135 days of culture period, some fish samples were transferred to the Lab. Blood were directly collected from the heart. Muscle composition was analyzed for proximate composition. The results showed that the body weight of samples in brackish water was increased significantly after 45 days of culture period. Blood factors including WBC, RBC, Hb, Hct, MCV, MCH, MCHC, lymphocyte, thrombocyte and concentration of K+ ions in fish cultured in brackish water showed a significant increase (P〈0.05). Muscle composition analysis showed a significant increasing (p〈0.05) in fat and dry matter in freshwater treatment, while moisture was significantly higher in brackish water (P〈0.01).
    Beschreibung: Article includes abstract in Farsi on last page.
    Schlagwort(e): Aquaculture ; Biology ; Fisheries ; Rainbow trout ; brackish water ; freshwater ; blood factors ; proximate composition ; growth ; Iran
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    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 836-842
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  • 93
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    Phytoplankton growth and microzooplankton grazing in the Homa Lagoon (İzmir Bay, Turkey) (2021)
    In:  http://aquaticcommons.org/id/eprint/22557 | 18721 | 2018-04-25 20:36:35 | 22557 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-07
    Beschreibung: Phytoplankton growth and microzooplankton grazing were investigated at one station in the Homa Lagoon from February to January in 2006-2007. Our results showed significant seasonal variations in phytoplankton dynamics. Microzooplankton was mainly composed of dinoflagellates and tintinnid ciliates and nauplii. Microzooplankton grazing increased with increasing of temperature. Grazing rate was maximum levels in spring and summer. Microphytoplankton, which dominated the total algal biomass and production, were characterized by the proliferation of several chain-forming diatoms. Small heterotrophic flagellates and aloricate ciliates were the main controllers of phytoplankton. Phytoplankton represented a significant for micrograzers, which grazing represented 20–120% of diatom and cynabacteria algal production during 2006-2007. Microzooplankton has, however, a relatively high impact on microphytoplankton, as 〉 45% of microalgal production was consumed throughout the year. These results suggest that the low grazing was one of the factors contributing to the development of the spring bloom. All of seasonal bases, the phytoplankton production were grazed by microzooplankton in summer, autumn and winter–spring seasons have been changing between 20%-120%. The seasonal variation in the microzooplankton grazing pressure seems to result from the dominant size class of the phytoplankton community of this lagoon diatom and cynabacteria.
    Schlagwort(e): Biology ; Ecology ; Grazing ; Lagoons ; Microzooplankton ; Nutrient ; Phytoplankton ; Homa Lagoon ; Turkey ; İzmir Bay ; growth
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    Format: application/pdf
    Format: application/pdf
    Format: 807-824
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  • 94
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    Elemental concentration and size relationship in African cuttlefish Sepia bertheloti, from the coastal waters of Qua Iboe River, Nigeria (2021)
    FISON | Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23249 | 19325 | 2018-03-25 14:29:19 | 23249 | Fisheries Society of Nigeria
    Details
    Publikationsdatum: 2021-07-13
    Beschreibung: Ten specimens of African cuttlefish, Sepia bertheloti, from the coastal waters off Qua Iboe River, Southeast Nigeria, were analyzed for the relationship between the concentration of the elements and the size of the species. Energy Dispersive X-ray fluorescence technique was employed to determine the elemental composition of the species. Eleven elements were identified in the body of cuttlefish. These were Chlorine, Strontium, Potassium, Calcium, Bromine, Iron, Copper, Zinc, Manganese, Nickel and Selenium of these elements, the concentration of calcium, potassium. Copper and strontium had a positive correlation with the weight, while the concentrations of manganese, nickel, chlorine, iron were negatively correlated with their weights. However, only manganese had a significantly negative correlation (p〈0. 05). Bromine and zinc had no correlation with the weights of the species. There also existed a significant positive correlation between Ca and K, Se and Ni, Cu, Br and Zn and St and K. We conclude that African cuttlefish, irrespective of size is a rich source of nutritional elements and is especially recommended for pregnant women and for all age groups.
    Beschreibung: Includes:- 2 figs.;9 refs.
    Schlagwort(e): Fisheries ; Sepia bertheloti ; ASE ; Nigeria ; Gulf of Guinea ; Nigeria ; Qua Iboe R. ; freshwater environment ; marine environment ; Nutritional requirements ; Potassium ; Nutrition
    Repository-Name: AquaDocs
    Materialart: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 245 - 249
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  • 95
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    Effects of Zinc and Copper exposure on growth and survival of Artemia urmiana and Artemia franciscana (2021)
    In:  http://aquaticcommons.org/id/eprint/23669 | 18721 | 2018-07-16 17:09:33 | 23669 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-15
    Beschreibung: The effects of exposure to Zinc and Copper in developing from nauplius to adult stages in two species, Artemia urmiana and A. franciscana were studied. The growth and lifespan of the specimens under treatments also have been investigated. During the period of the experiments, both species of Artemia were exposed by Zinc-treated groups (23, 68, 114 mg/l) and also copper-treated groups (13, 25, 38 mg/l) and compared with control group without any metal treatment. However, in treatments with Zinc and Copper concentrations, lifespan was reduced in comparison with that of the control treatments. Results showed that Zinc and Copper have toxic effects on A. urmiana and A. franciscana. Although the resistance of both of them was high, but A. urmiana was more endure than A. franciscana. It is suggested that the two Artemia species might have adopted a strategy to speed up growth and reproduce before metal pollution can cause death for them. Also, this study indicated that Zinc was less toxic than Copper for the two species investigated.
    Schlagwort(e): Aquaculture ; Growth ; Zinc ; Survival ; Reproduction ; Toxicity ; Copper ; Toxicity tolerance ; Marine ; Artemia franciscana ; Artemia urmiana ; Tehran Province ; Iran
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    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 123-132
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  • 96
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    The correlation of length and weight of Kutum (Rutilus frisii kutum) in the central south of Caspian Sea with copper and zinc concentration in muscle and liver tissues (2021)
    In:  http://aquaticcommons.org/id/eprint/23685 | 18721 | 2018-07-18 06:54:47 | 23685 | Iranian Fisheries Science Research Institute
    Details
    Publikationsdatum: 2021-07-15
    Beschreibung: Concentration of copper (Cu) and zinc (Zn) in liver and muscle tissues of Kutum (Rutilus frisii kutum) of the Caspian Sea was assessed to study possible correlation of length and weight and the bioaccumulation of these heavy metals in the fish. Concentration of the metals in liver was higher than muscle (Zn: 55.2, Cu: 41.5 kg/g) while the concentrations in the muscle tissue were lower than permissible limits proposed by FAO. Significant correlations were not detected between mean Zn and cu concentration and fish size. Finally, no significant difference was found in the concentration of the heavy metals in male and female fish specimens (P〉0.05).
    Schlagwort(e): Fisheries ; Pollution ; Length-weight relationships ; Bioaccumulation ; Fish physiology ; Heavy metals ; Zinc ; Muscles ; Liver ; Copper ; Freshwater fish ; Correlation analysis ; Rutilus frisii ; Brackish ; Caspian Sea ; Caspian Sea Eurasia ; Iran
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    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 121-128
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  • 97
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    Effect of zinc on the distribution of major cations and anions in the muscle of the fresh water catfish Clarias gariepinus (Burchell, 1822) collected from Ebonyi River, South East Nigeria (2021)
    Lagos (Nigeria) | FISON
    In:  http://aquaticcommons.org/id/eprint/24214 | 19325 | 2018-05-19 06:50:34 | 24214 | Fisheries Society of Nigeria
    Details
    Publikationsdatum: 2021-07-15
    Beschreibung: The effect of zinc exposure evaluated during a four day exposure periods at 13.88ppm, 26.75ppm, 53.5ppm,107ppm and 214ppm to Clarias gariepinus sub-adults showed the 96h LC50 as 26.62ppm. The threshold value was 20.30ppm. The muscle of the exposed fish analyzed showed a significant decrease in all the major cations and anions (Na+, CL-, Ca2+ K+, Mg2+) at (p〈0.05). The research revealed that there was no total inhibition of uptake of the cations and anions and also that uptake of these metals, that is cations and anions (Na+,-CL-, Ca2+ K+, Mg2+) increased rapidly during the 24 hours and dropped at 48 hours and 72 hours and gradually increased at the end of 96 hours showing that it was time dependent. During exposure period, affected fish stood in upright position with their snouts above the water surface, gasping for air. Observation of the exposed fish showed that they were peeling of skin, increase in opercula movement, erratic swimming, quietness and finally death. This research therefore recommends that zinc should be applied appropriately at 26.30ppm to avoid death of fish, man and other aquatic organisms that are the chief consumer.
    Beschreibung: Includes: 13 references.
    Schlagwort(e): Pollution ; Fisheries ; Clarias gariepinus ; Nigeria ; Ebonyi State ; Ebonyi River ; Zinc ; Muscle ; Cations ; Anions ; Clarias gariepinus ; Zinc ; Freshwater fish ; Cations ; Pollution effects ; Trace metals ; Bioaccumulation ; Muscles ; Pollutants ; Anions ; River fisheries ; Lethal limits
    Repository-Name: AquaDocs
    Materialart: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 240-242
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  • 98
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    Assessment of some heavy metals pollution in Clarias gariepinus in the vicinity of Lake Chad, Nigerian sector, using energy dispersive X-ray fluorescence (EDXRF) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24243 | 19325 | 2018-05-20 05:39:07 | 24243 | Fisheries Society of Nigeria
    Details
    Publikationsdatum: 2021-07-15
    Beschreibung: Globally, aquatic ecosystems are highly polluted with heavy metals from anthropogenic and terrigenous sources. The objectives of this study, is to portray the use of EDXRF for the analysis of heavy metal pollution in Clarias gariepinus. C. gariepinus were collected from Dumba, Lake Chad, Nigerian sector and analyzed with EDXRF with 〈sup〉109〈/sup〉Cd as excitation source of the samples. The concentrations of Cadmium, Chromium, Copper, Manganese, Iron, Lead and Zinc (Cd, Cr, Cu, Mn, Fe, Pb and Zn) in mg/kg were determined in C. gariepinus and were compared with World Health Organization (WHO, 1985) and Federal Environmental Protection Agency (FEPA, 2003) to ascertain the level of Cd, Cr, Cu, Mn, Fe, Pb and Zn in C. gariepinus from Dumba. The results indicated that C. gariepinus is polluted with Cr, Cu, Mn, and Pb when compared with permissible limit of WHO, 1985 and FEPA, 2003. Therefore, the consumption of C. gariepinus from Dumba may pose a health risk.
    Beschreibung: Includes: 12 references.
    Schlagwort(e): Fisheries ; Pollution ; Clarias gariepinus ; Nigeria ; Borno ; Chad L. ; freshwater environment ; Heavy metals ; Pollutants ; Freshwater fish ; X-ray fluorescence analysis ; Standards ; Acceptability ; Pollution effects ; Cadmium ; Chromium ; Copper ; Manganese ; Iron ; Lead ; Zinc
    Repository-Name: AquaDocs
    Materialart: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 361-363
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    Filipino engineer makes big strides in freshwater prawn culture (2021)
    In:  aqdchief@seafdec.org.ph | http://aquaticcommons.org/id/eprint/19947 | 2002 | 2016-02-23 19:21:29 | 19947 | Southeast Asian Fisheries Development Center, Aquaculture Department
    Details
    Publikationsdatum: 2021-07-05
    Schlagwort(e): Aquaculture ; Macrobrachium rosenbergii ; Philippines ; Luzon ; Pampanga ; freshwater environment ; brood stocks ; culture tanks ; feed ; feeding ; freshwater aquaculture ; growth ; hatcheries ; pond culture ; prawn culture
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: pp. 20, 11-12
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    A review of some ecological factors affecting the growth of Azolla spp (2021)
    In:  http://aquaticcommons.org/id/eprint/21719 | 18721 | 2017-11-28 08:50:09 | 21719 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publikationsdatum: 2021-06-29
    Beschreibung: The genus Azolla forms a group of small-leafed, floating aquatic ferns native to the tropics, subtropics,and warm temperate regions of Africa, Asia, and America. For several decades, these ferns have been utilized for various purposes: e.g. as green manure, feed for animals, but also for the removal of different metals (e.g. Hg, Pb, Cr and Cd) through wastewater treatment or for elimination of nitrogenous compounds from surface water. Notwithstanding, these many advantages of Azolla, it has invaded many natural habitats, thus becoming an obnoxious weed. Azolla can grow quickly with a doubling time of only 2-5 days and form very dense mats in favourable habitats, causing many difficulties for boat transport, water animals and native plant species and becoming a source of eutrophication. The present paper gives an overview of some important ecological factors affecting Azolla’s growth over the past few decades. Moreover, for the most ecological variables discussed in this study, the authors refer to their recent publications for the habitat requirements of Azolla in Anzali wetland. Water availability is the key factor for its growth. Growth is further promoted by optimal light intensity (15-18 Klux), temperature (18°- 28°C) and relative humidity (55-83%). Wind and turbulent water can fragment and kill Azolla. The importance of both macro (e.g. phosphorus, nitrogen, potassium, calcium and magnesium) and micronutrients (e.g. molybdenum, cobalt and etc.) has also been confirmed from literature. Various types of insects (e.g. caterpillars), bacteria, fungi and viruses can affect Azolla growth. As a conclusion,understanding the habitat requirements of Azolla is very helpful for managing this aquatic fern, also for decision making in the context of wetland restoration and conservation management.
    Schlagwort(e): Chemistry ; Conservation ; Ecology ; Azolla spp. ; ecological ; growth
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 65-76
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