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  • Temperature  (4)
  • Diversity  (2)
  • 2015-2019  (6)
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  • 1
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    Population structure study of Anzali wetland zooplankton (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Anzali wetland is one of the most important places for spawning fishes and zooplankton groups are the first consumer in this ecosystem . they are the perfect food for the larvae of fishes. Zooplankton status was evaluated in 6 stations of different areas of the Anzali wetland during March 2011 to February 2012. Sampling was done by tube (PVC) and passing through of 30 micron planktonic net. The samples were identified and counted by invert microscope. According to the results were identified 60 Genus and 6 phylum (11, 31, 10, 2, 1, 1, 1, 2 genus of phylum Protozoa, Rotatoria, Arthropoda, Gastrotricha, Mollusca, Tardigrada, Nematoda, Porifera, Annelida) respectively. The results showed that the maximum annual average density of zooplankton was observed with 2497 number per litre in Karkan station and the population was more in the summer than in other seasons. Phylum of Rotatoria,, protozoa and superclass Copepoda formed 48, 45 and 6percent of the density espectively. According to the results the populationof zooplankton did not change much compared to past studies, excluding Protozoa but the diversity of all zooplankton groupe are declined very much. According to the statistical analysis Kruskal Wallis are not significant differences between density of zooplankton in different stations, months and seasons (p 〉 0.05),but significant differences were found in different phylum together (p 〈 0.05).
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Zooplankton ; Density ; Diversity
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 48pp.
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  • 2
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    Enhancing maturation of Astacus leptodactylus by temperature modification (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The object of this survey is to enhance maturation of Astacus leptodactylus by temperature modification in order to have juveniles in the starting period of crayfish culture and to reach an acceptable market size at the end of one period culture as well. The research initiated from 27 November 2000 and lasted on 21 November 2001 at safidrood shilati research station. Crayfish brooders were catched by funnel trap from arass reservoir on late November 2000 and transferred to safidrood shilati researchstation , hold on concret pond as long as to observe eggs. Enhancing of the time of maturation conducted on one treatment and four replicate with raising temperature of the medium to 18-20 ºc . Four replicate used for control under natural temperature which ranged between 13.3 to 20.4ºc with average 16.8ºc . The dissolve oxygen concentration varied from 5.12 to 9.46 mg/l while Phof water were between 7.25 to 8.10 on mide April 2001. Egg development were observed on treatment which were one month earlier than control. Each crayfish produced 5 miniator with average individual weight of 50mg. The jovial of both treatment and control rared for seven days. Fed by dafni , chapped kilka and rice brain . To evaluate the relative growth between control and treatment, two soil pond with surface area of 100 m2 were used for the culture. The duration of culture concerning to treatment was 210 dfays while for the control was 180 days.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Maturation ; Astacus leptodactylus ; Temperature ; Survey ; Crayfish ; Culture ; Brooders ; Eggs ; Dissolved oxygen ; Growth
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 41pp.
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  • 3
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    Population structure study of Anzali wetland phytoplankton (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Phytoplankton groups are very important producers in the anzali lagoon that have a significant role in the quality of water and the need to be constantly study their sequence and density.The surveywas conducted in six workstations March 1389-Feb 2012. Samples were taken for a liter of water with plicae (P.V.C) and fixed with formalin to 4% ratio. Five ml of the sample after becoming homogeneous, was sequestration for 24 hours in the laboratory and identified and counted by invert microscope. Based on the results of this reviews 67 genus (22, 26, 9, 5, 1, 2, 1, and 1 genus respectively of the Bacillariophyta, Chlorophyta, Cyanophyta branches, Cryptophyta, Euglenophyta Chrysophyta, Pyrrophyta, the Xanthophyta) were identified. The results showed that the phytoplankton density was the most in Sorkhankol and Komeh Aghajani stations with annual average of 24387483±5643414 and 20381250 ± 5488084 per liter respectively. The Bacillariophyta ( particularly Cyclotella) was dominant in all of stations but high density of blue green algae (Cyanophyta) in Komeh aghajani station from July to mid-October have caused the annual average of these phylum is more than Bacillariophyta. In General, the average density of phytoplankton was the highest in summer than other seasons and was the lowest value in the fall. The number of the genus identified in this survay is less than previous studies. Compare this survey with the last studies reviews shows that diversity is reduced in the current situation in the anzali than previous studies. According to thestatistical analysis of the Kruskal Wallis, the density of phytoplankton had no significant differences in the different months, stations and seasons (p 〉0.05) but the phytoplankton phylums have significant differences (p 〈 0.05) together.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Diversity ; Phytoplankton ; Density
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 50pp.
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  • 4
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    The study and feasibility of Cheshmeh-Ali River and down stream area of Shahid Shah-Charaghy Dam in Damghan for aquaculture development (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This research was conducted to finding of Cheshmeh-Ali and Shahcheraghi-Dam downstream areas potential for developing of aquaculture industry. The present study was conducted based on available information and data from monthly and seasonally sampling including geographical area, margin lands and fluctuations of river water, seasonal climatic changes view point of rainfall, temperature, wet, evaporation, wind velocity, sunshine hours, frost and also chemical and physical parameters of water including temperature, alkalinity, total hardness, chloride, calcium, magnesium, sodium, potassium, organic phosphorous and nitrogen, suspended solids, turbidity, water flow and flood conditions, and in addition phytoplankton and zooplankton communities, macrobenthic invertebrates, fishes, aquatic plants, amphibians, reptiles, birds. Results showed that the upstream and downstream regions of Shahcheraghi dam are not suitable for warm water aquaculture in earthen ponds. But view point of cold-water aquaculture, particularly trout, there are some good situations. Also it can be suggested different culture systems including of race way, octagonal concrete ponds, semi-circulation and circulation methods. But, due to water restrictions in the area, semi-circulation and circulation system is preferred. In ideal conditions can be produced about 1,600 tones of trout, if all the capacity of this area be used for aquaculture. Otherwise, in limited circumstances view point of exploitation possibility of the water, only about 700 tons can be produced. In addition, there were appropriate facilities in spring area of Cheshmehali for tourism industry, that it can be considered as priorities for economic development in the region. Due to the low sensitivity of the ecologically conditions, native or exotic aquatic species rearing in indoor methods can be recommended.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Chemical ; Physical ; Site selection ; Aquaculture capacity ; Sampling ; Temperature ; Turbidity ; Culture
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 71pp.
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  • 5
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    Investigating effects of the excessive growth of aquatic plants on water quality in Anzali Lagoon, south-western Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: In this study, excessive growth in submerged aquatic plants such as Coontail (Ceratophyllum demersum) and Pondweed (Potamogeton spp.), floating-leaved species such as Lotus (Nelumbo nucifera) and free-floating species such as Water Fern (Azolla filiculoides) in Anzali Lagoon was observed. We studied effects of excessive growth of these plants on water quality in Anzali Lagoon over the years 1998-2000. Assessed the possible effects of canopy formation and growing sites of these plants on habitat of aquatic animals was studied too. We showed that dissolved oxygen concentration (DO), pH and water temperature are associated with the growth and distribution of the aquatic plants, and established a significant relationship between vertical DO, pH and water temperature and location of canopy of these plants in the water column. Also, an increase in the amount of DO and pH in areas around the canopy and under it for submerged plants observed. This was not the case for floating-leaved and free-floating aquatic plants. The higher water turbulence in areas free from aquatic plants increased DO in lower layers of water column compared to areas covered with aquatic plants. We related the amount of DO and pH of water to growth form in aquatic plants that determines location of canopy formation in these plants. Contrary to the location of canopy and growing site factors, the extent of growth of these plants did not show an effect on DO and pH of water.
    Description: Published
    Keywords: Growth ; Aquatic plants ; Water quality ; Coontail ; Ceratophyllum demersum ; Pondweed ; Potamogeton spp. ; Lotus ; Nelumbo nucifera ; Fern ; Azolla filiculoides ; Dissolved oxygen ; DO ; pH ; Temperature
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.139-150
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  • 6
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    The Study of Establishment of Rainbow trout Culture and Hachery’s Farms on Zayanderood’s River region in Caharmahal and Bakhtiyari Province (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The aim of this study was to find the best location for establishment of rainbow trout culture and hatcheries farms on Zayanderood’s river region in Charmahal and Bakhtiyari province. This survey carried out over ten station along Zayanderood’s river. The result of physical and chemical analysis showd that the annual average of air temperature varied from 9.5oc o 10oc wehre the pH annual average value were between 7.5 and 8.8. the dissolve oxygen concentration in stations except in rainbow trout farm effluent were above 10 mg/l. the other chemical , pollutant as well as pesticides levels were under the limiting concentration for rainbow trout culture and Hatcheries activity . The plankton survey showed that the Bacillurophyta were the dominant group of phytoplankton where protozoa constituted the most abundant group of zooplankton the Benthic organisms sensitive to pollutant in particular Epirus were dominant group in all stations . In regard to fishes presence in river , five species of Ciprinidae , one species from Balitoridae and one species from salmonidae families were identified . The capacity for development of rainbow trout culture for tow phase period in Zayanderood’s river region with respect to self purification potential (self purification potential were determined from the oxidation of the effluent of the only active trout farm of the river region), minimum of 10 L/s water requirement for production of trout in concrete canal and pond system and 1L/S water need for production in semi circular closed system were estimated to be 5202 metric tons.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Physical ; Chemical ; Positioning ; Rainbow trout ; Self purification ; Culture ; Hatchery ; Survey ; Temperature ; pH ; Dissolved oxygen ; Pollutant ; Plankton ; Bacillurophyta ; Phytoplankton ; Protozoa ; Zooplankton ; Benthic organisms ; Ciprinidae ; Balitoridae ; Salmonidae
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 68pp.
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