ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Publication Date: 2021-05-19
    Description: Nereis diversicolor worms were collected from the Anzali lagoon during the years 2004-2006 using Van Veen grab sampler with a surface area of 400cm super(2). Water salinity, temperature and total organic matter (TOM) of sediments in the sampling region was determined. The worms were maintained in 0.5 tons (1x1m2 super(2)) tanks until they reached a weight of 200-300mg. Sexual maturity in the samples was attained at 4-6C and spawning occurred at approximately 16C. The first gametes were observed after the temperature increased from 6 to 16C. Sexual maturity was studied at various salinities (0.5, 5, 12, and 15 ppt). Results indicated that the worm attains sexual maturity at salinity 15ppt in a shorter period as compared to other salinities. No significant differences were observed between sexual maturity attained at salinities 12 and 15ppt (P〉0.05). The effect of light and photoperiod in synchronizing reproduction in male and female N. diversicolor was also studied. We observed that reproduction behavior in adult worms increased for a period of one week at the end of each month after they were exposed to a prolonged photoperiod (L:D 16:8) followed by a period of dim light. Mature males crawled around outside the tubes in search of a female. In the presence of a mature female, the males released sperm directly in front of the female tube. Soon after, there was an increase in the activity of the females which showed intense ventilation movements. The female worms with their eggs already released began to carry the sperm into their tube. The ripe females nearby which had not yet laid eggs in their tubes released their gametes a few minutes after the male and began to carry sperm into their tubes. The fertilized eggs remained inside the tube protected by the female. The benthic larvae developed fast, feeding on the mucus and microbial film on the tube wall. After 10 to 14 days, larvae began to leave the tube. A few days later the females died.
    Description: Published
    Keywords: Salinity ; Photoperiods ; Reproductive cycle ; Nereis diversicolor ; Sexual maturity ; Temperature ; Reproduction ; Spawning ; Biological fertilization ; Freshwater
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.11-20
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2021-05-19
    Description: The marine survey for sturgeon stock assessment was conducted in summer, winter and spring in the years 2006 and 2009 to estimate the relative and absolute abundance and percentage composition of each species in the Guilan, Mazandaran and Golestan Provinces. This survey was carried out in the Iranian waters of the Caspian Sea on board the Sisara2 and Guilan vessels using trawl nets at 2-100 m depths. Trawling was carried out in 85 stations that were selected using a stratified random design. The number of stations in each scope was based on the area of the scope in terms of the total area. Trawling and sampling in shallow water up to 10 m were carried out using 9 m trawl nets whereas 24.7 m trawl nets were used for depths more than 10 m. Trawl surveys were carried out in the daytime. Trawling velocity was kept at 2.5-3 kts and trawls lasted half an hour in order to calculate abundance, and biomass of sturgeons using the swept area method. Catch per unit area (CPUA) in the winter 2006 survey was 3853 specimens nm2 , in the summer and winter 2007 survey was 1854 , 2912 specimens nm2 at depths less than 10 m respectively . CPUA for sturgeons in spring 2008 survey was 2103 specimens nm2 at depths less than 10 m and 393 specimens nm2 at depths greater than 10 m (10-100 m depth). These values in the winter 2008 survey dropped to 44 specimens nm2 at depths at depths above 10 m. CPUA for sturgeons in the spring 2009 survey was 300 specimens nm2 at depths less than 10 m and 307 specimens nm2 at depths greater than 10 m. In all the surveys conducted CPUA for A. persicus was higher than that for the other sturgeon species. Based on the calculations carried out in the marine survey in winter 2006 the estimated absolute abundance for sturgeons was about 2977.363 thousand. The total biomass of sturgeon was estimated as 131.713 tons. In the summer 2007 survey total abundance was estimated 1432.398 thousand, and total biomass of sturgeons was estimated at about 312.161 tons. In the winter 2007 survey total abundance for sturgeons was estimated at about 2250.105 thousand, and total biomass was estimated 578.08 tons. In the spring 2008 survey total abundance was estimated at about 3002.832 thousand. The total biomass was estimated at about 2533.318 tons .In the winter 2008 survey total abundance was estimated at about 152.722 thousand, and total biomass in winter 2008 was estimated 170.540 tons. Total abundance in spring 2009 survey was 1310.232 thousand and total biomass was estimated at 2019.tons. Investigation of stomach content of sturgeon Acipenser persicus caught under 10m depth in 2006 to 2007 surveys showed that there is significant difference in the consumed food. Polychaeta is the major food consumed and crustacean an the minor one(P〉0.05).Also no new types of food( such as bony fishes or benthic) have been observed in food chain of Acipenser persicus only the food consumption rate has been related to the season of year and increases or decreases in warm or cold seasons, respectively For physiological study and determination of sexual maturation stages in sturgeon,119 gonad sampling prepared. The results showed that 63 % of fishes were females and 37 % of them were males. Gill microscopic study shows complications such as hyperplasia, curvature, adhesion, embowed, shorting and lengthen of secondary filaments and fraught bloody. Microscopic study on liver indicates signs of cloudy inflammation, fatty degeneration, dispersion of billed secretions and cell atrophy. The population genetic structure of Persian sturgeon (Acipenser persicus) in Sefidrood and Gorganrood rivers watershed analyzed based on microsatellite markers during sturgeons assessment in 2006-2008. Results showed that Acipenser persicus in two region of south part of Caspian Sea are two independent populations.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Stock assessment ; Sturgeon ; Acipenser persicus ; Diet ; Gills ; Sex ; Microsatellite ; Population ; Genetic ; Survey ; Species ; Sampling ; Trawling ; CPUA ; A. persicus ; Biomass ; Polychaeta ; Maturation
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 154pp.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2021-05-19
    Description: Tish survey prolonged from summer 2011 trough summer 2012. During this period 574 samples of different fish species were investigated for their parasites. Totally 30 species of parasites isolated of the fishes. Some of the isolated parasites are recorded for the first time in Iran. Rafidascaris acus Orientocreadium siluri, Silurotaenia siluri, Acanthocephalus lucii , Argulus foliaceus has recorded for the first time from European catfish, Silurus glanis, and Dactylogyrus inexpectatus has recorded for the first time from Gibel Carp, Carassius auratus gibelio, in Anzali wetland. Statistical comparison of parasites infections and intensity between the different area of Anzali wetland were done. Infection of Pike, Esox lucius, to Diplostomum spathaceum, Raphidascaris acus and Monogenean in western parts of wetland were significantly different from the Eastern and Central areas (p〈0.05). So based on the data have concluded the eastern and central regions of the wetland are more polluted than the western part. Comparing the results of the present study with before ones showed that the composition of parasite species has been changed over time, while the prevalence, intensity and abundance of parasites have been increased. It may be due to changing environmental conditions such as increasing discharge of effluent, eutrophication of the wetland. This results accents to necessity of reconstruction of Anzali wetland with preference of eastern and central regions.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Parasites ; Fish ; Infection ; Intensity ; Survey ; Samples ; Species ; Rafidascarisacus ; Orientocreadium siluri ; Silurotaenia siluri ; Acanthocephalus lucii ; Argulus foliaceus ; Catfish ; Gibel carp
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 42pp.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2021-05-19
    Description: In this study, the effect of diets containing different levels of Pontogammarus maeoticus extract as natural nutrient attractant was investigated on growth indices, chemical composition and mucosal Immunity of Rutilus kutum. For this purpose, fish with an average weight of 0.35±0.067 were stored in 100L fiberglass tanks containing 30 liters water with a density of 20 fish per tank for eight weeks. To perform this study, Gammaridae extracts were mixed with distilled water in three concentrations: 1:25 (25%), 1:50 (50%), 1:75 (75%) and two percent of each dilution was added to manual meals before each feeding. This experiment was performed as four triplicated treatments. Larvae were fed four times a day. At the end of the culture, growth indices such as: mean body weight gain, specific growth factor, food conversion ratio, survival, chemical analysis of carcasses and some mucosal immune parameters including; lysozyme, immunoglobulin, alkaline phosphatase and protease were studied. The results showed that although growth factor and carcass analysis were improved in all treatments (25%), this increase was not significant compared to the control (p〉0.05). All Mucus immune factors significantly increased in all treatments compare to control (p〈0.05). The result of this study showed that the Gammaridae extract had no significant effect on the improvement of growth performance, but increased the immunity of Rutilus frisii in culture conditions.
    Description: Published
    Keywords: Rutilus frisii kutum ; Fish ; Mocuse ; Growth factor ; Immune system
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.47-55
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 2021-05-19
    Description: The present research aimed to study effect of Nereis worm in feeding, growth, survival and carcass biochimical compositions of persian sturgeon larvae. Five diets including zooplankton (100%) as the control (Z), Nereis diversicolor worm (100%), a mix of Nereis and zooplankton (50% for each), a mix of Nereis, zooplankton and concentrate food (33% for each) with 3 replicates were established. At first, Nereis worms were cultured up to the weight of 200 mg according to the protocol done in the International Sturgeon Research Institute. Required zooplanktons were obtained for Dr. Beheshti Sturgeon Rearing and propagation center. Concentrate food was also made in the ISRI. Persian sturgeon larvae with the average weight of 95.66 mg were put in 60-Liter tank (60 larvae in each tank) under the same physical and chemical parameters of water. 8 days after the beginning of active feeding, they were fed five times a day with experimental dites based on 20-30% of their weight for 15 days. Water quality parameters, such as dissolved oxygen, temperature, pH values were recorded daily. The average of temperature, pH and dissolved oxygen during the test were 22.8±1.3ºc, 7.5±0.1 and 6.58±0.9 mg/l respectively. At the end of this period, condition factor (k), specific growth rate (SGR), food conversion rate (FCR), weight gain (WG) and Body weight index (BWI) were calculated. Total fat and fatty acids profile were analyzed. The results showed that there was a significant difference between growth indexes and food consumption (p〈0.05). BWI, GR and SGR indices showed no significant difference between N and NZ treatment, but the average of these indices were higher in NZ treatment. The most and the least average of SGR, BWI were observed in NZ and NZC treatments respectively. Condition factor showed no significant difference in all diets except NZ. FCR had no significant difference between N and NZ as well as after diets. The highest and the lowest survival rate was observed in N treatment (96.11±1.46%) and NZC (85.55±3.37%) respectively. The results of carcass analysis showed that there is a strong correlation between fatty acids of body and fat resources of diets. According to the significant difference in growth rate between treatments (p〈0.05), the larvae fed with N diet presented a better performance compared with others. These results indicate that cultured sturgeon larvae need n-3 and n-6 series of fatty acids in their diet.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biochemical ; Physical ; Chemical ; Acipenser persicus ; Nereis diversicolor ; Growth ; Survival ; Fatty acids ; Larvae ; Feeding ; Persian sturgeon ; Zooplankton ; Dissolved oxygen ; Temperature ; pH ; SGR
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 69pp.
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    facet.materialart.
    Unknown
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25636 | 18721 | 2018-10-07 17:03:45 | 25636 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: Tish survey prolonged from summer 2011 trough summer 2012. During this period 574 samples of different fish species were investigated for their parasites. Totally 30 species of parasites isolated of the fishes. Some of the isolated parasites are recorded for the first time in Iran. Rafidascaris acus Orientocreadium siluri, Silurotaenia siluri, Acanthocephalus lucii , Argulus foliaceus has recorded for the first time from European catfish, Silurus glanis, and Dactylogyrus inexpectatus has recorded for the first time from Gibel Carp, Carassius auratus gibelio, in Anzali wetland. Statistical comparison of parasites infections and intensity between the different area of Anzali wetland were done. Infection of Pike, Esox lucius, to Diplostomum spathaceum, Raphidascaris acus and Monogenean in western parts of wetland were significantly different from the Eastern and Central areas (p〈0.05). So based on the data have concluded the eastern and central regions of the wetland are more polluted than the western part. Comparing the results of the present study with before ones showed that the composition of parasite species has been changed over time, while the prevalence, intensity and abundance of parasites have been increased. It may be due to changing environmental conditions such as increasing discharge of effluent, eutrophication of the wetland. This results accents to necessity of reconstruction of Anzali wetland with preference of eastern and central regions.
    Keywords: Health ; Iran ; Anzali Wetland ; Anzali Lagoon ; Parasites ; Fish ; Infection ; Intensity ; Survey ; Samples ; Species ; Rafidascarisacus ; Orientocreadium siluri ; Silurotaenia siluri ; Acanthocephalus lucii ; Argulus foliaceus ; Catfish ; Gibel carp
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 42
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    facet.materialart.
    Unknown
    In:  http://aquaticcommons.org/id/eprint/23796 | 18721 | 2018-07-27 14:30:15 | 23796 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-15
    Description: Nereis diversicolor worms were collected from the Anzali lagoon during the years 2004-2006 using Van Veen grab sampler with a surface area of 400cm ^(2). Water salinity, temperature and total organic matter (TOM) of sediments in the sampling region was determined. The worms were maintained in 0.5 tons (1x1m ^(2)) tanks until they reached a weight of 200-300mg. Sexual maturity in the samples was attained at 4-6C and spawning occurred at approximately 16°C. The first gametes were observed after the temperature increased from 6 to 16C. Sexual maturity was studied at various salinities (0.5, 5, 12, and 15 ppt). Results indicated that the worm attains sexual maturity at salinity 15ppt in a shorter period as compared to other salinities. No significant differences were observed between sexual maturity attained at salinities 12 and 15ppt (P〉0.05). The effect of light and photoperiod in synchronizing reproduction in male and female N. diversicolor was also studied. We observed that reproduction behavior in adult worms increased for a period of one week at the end of each month after they were exposed to a prolonged photoperiod (L:D 16:8) followed by a period of dim light. Mature males crawled around outside the tubes in search of a female. In the presence of a mature female, the males released sperm directly in front of the female tube. Soon after, there was an increase in the activity of the females which showed intense ventilation movements. The female worms with their eggs already released began to carry the sperm into their tube. The ripe females nearby which had not yet laid eggs in their tubes released their gametes a few minutes after the male and began to carry sperm into their tubes. The fertilized eggs remained inside the tube protected by the female. The benthic larvae developed fast, feeding on the mucus and microbial film on the tube wall. After 10 to 14 days, larvae began to leave the tube. A few days later the females died.
    Keywords: Biology ; Reproduction ; Fertilization ; Nereis diversicolor ; Gilan Province ; Anzali Lagoon ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 11-20
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    facet.materialart.
    Unknown
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25298 | 18721 | 2018-09-07 08:30:09 | 25298 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: The marine survey for sturgeon stock assessment was conducted in summer, winter and spring in the years 2006 and 2009 to estimate the relative and absolute abundance and percentage composition of each species in the Guilan, Mazandaran and Golestan Provinces. This survey was carried out in the Iranian waters of the Caspian Sea on board the Sisara2 and Guilan vessels using trawl nets at 2-100 m depths. Trawling was carried out in 85 stations that were selected using a stratified random design. The number of stations in each scope was based on the area of the scope in terms of the total area. Trawling and sampling in shallow water up to 10 m were carried out using 9 m trawl nets whereas 24.7 m trawl nets were used for depths more than 10 m. Trawl surveys were carried out in the daytime. Trawling velocity was kept at 2.5-3 kts and trawls lasted half an hour in order to calculate abundance, and biomass of sturgeons using the swept area method. Catch per unit area (CPUA) in the winter 2006 survey was 3853 specimens nm^2 , in the summer and winter 2007 survey was 1854 , 2912 specimens nm^2 at depths less than 10 m respectively . CPUA for sturgeons in spring 2008 survey was 2103 specimens nm2 at depths less than 10 m and 393 specimens nm2 at depths greater than 10 m (10-100 m depth). These values in the winter 2008 survey dropped to 44 specimens nm^2 at depths at depths above 10 m. CPUA for sturgeons in the spring 2009 survey was 300 specimens nm^2 at depths less than 10 m and 307 specimens nm^2 at depths greater than 10 m. In all the surveys conducted CPUA for A. persicus was higher than that for the other sturgeon species. Based on the calculations carried out in the marine survey in winter 2006 the estimated absolute abundance for sturgeons was about 2977.363 thousand. The total biomass of sturgeon was estimated as 131.713 tons. In the summer 2007 survey total abundance was estimated 1432.398 thousand, and total biomass of sturgeons was estimated at about 312.161 tons. In the winter 2007 survey total abundance for sturgeons was estimated at about 2250.105 thousand, and total biomass was estimated 578.08 tons. In the spring 2008 survey total abundance was estimated at about 3002.832 thousand. The total biomass was estimated at about 2533.318 tons .In the winter 2008 survey total abundance was estimated at about 152.722 thousand, and total biomass in winter 2008 was estimated 170.540 tons. Total abundance in spring 2009 survey was 1310.232 thousand and total biomass was estimated at 2019.tons. Investigation of stomach content of sturgeon Acipenser persicus caught under 10m depth in 2006 to 2007 surveys showed that there is significant difference in the consumed food. Polychaeta is the major food consumed and crustacean an the minor one(P〉0.05).Also no new types of food( such as bony fishes or benthic) have been observed in food chain of Acipenser persicus only the food consumption rate has been related to the season of year and increases or decreases in warm or cold seasons, respectively For physiological study and determination of sexual maturation stages in sturgeon,119 gonad sampling prepared. The results showed that 63 % of fishes were females and 37 % of them were males. Gill microscopic study shows complications such as hyperplasia, curvature, adhesion, embowed, shorting and lengthen of secondary filaments and fraught bloody. Microscopic study on liver indicates signs of cloudy inflammation, fatty degeneration, dispersion of billed secretions and cell atrophy. The population genetic structure of Persian sturgeon (Acipenser persicus) in Sefidrood and Gorganrood rivers watershed analyzed based on microsatellite markers during sturgeons assessment in 2006-2008. Results showed that Acipenser persicus in two region of south part of Caspian Sea are two independent populations.
    Keywords: Fisheries ; Iran ; Caspian Sea ; Mazandaran Province ; Golestan Province ; Guilan Province ; Sefidrood River ; Gorganrood River ; Stock assessment ; Sturgeon ; Acipenser persicus ; Diet ; Gills ; Sex ; Microsatellite ; Population ; Genetic ; Survey ; Species ; Sampling ; Trawling ; CPUA ; A. persicus ; Biomass ; Polychaeta ; Maturation
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 154
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    facet.materialart.
    Unknown
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25390 | 18721 | 2018-09-14 07:50:08 | 25390 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: The present research aimed to study effect of Nereis worm in feeding, growth, survival and carcass biochimical compositions of persian sturgeon larvae. Five diets including zooplankton (100%) as the control (Z), Nereis diversicolor worm (100%), a mix of Nereis and zooplankton (50% for each), a mix of Nereis, zooplankton and concentrate food (33% for each) with 3 replicates were established. At first, Nereis worms were cultured up to the weight of 200 mg according to the protocol done in the International Sturgeon Research Institute. Required zooplanktons were obtained for Dr. Beheshti Sturgeon Rearing and propagation center. Concentrate food was also made in the ISRI. Persian sturgeon larvae with the average weight of 95.66 mg were put in 60-Liter tank (60 larvae in each tank) under the same physical and chemical parameters of water. 8 days after the beginning of active feeding, they were fed five times a day with experimental dites based on 20-30% of their weight for 15 days. Water quality parameters, such as dissolved oxygen, temperature, pH values were recorded daily. The average of temperature, pH and dissolved oxygen during the test were 22.8±1.3ºc, 7.5±0.1 and 6.58±0.9 mg/l respectively. At the end of this period, condition factor (k), specific growth rate (SGR), food conversion rate (FCR), weight gain (WG) and Body weight index (BWI) were calculated. Total fat and fatty acids profile were analyzed. The results showed that there was a significant difference between growth indexes and food consumption (p〈0.05). BWI, GR and SGR indices showed no significant difference between N and NZ treatment, but the average of these indices were higher in NZ treatment. The most and the least average of SGR, BWI were observed in NZ and NZC treatments respectively. Condition factor showed no significant difference in all diets except NZ. FCR had no significant difference between N and NZ as well as after diets. The highest and the lowest survival rate was observed in N treatment (96.11±1.46%) and NZC (85.55±3.37%) respectively. The results of carcass analysis showed that there is a strong correlation between fatty acids of body and fat resources of diets. According to the significant difference in growth rate between treatments (p〈0.05), the larvae fed with N diet presented a better performance compared with others. These results indicate that cultured sturgeon larvae need n-3 and n-6 series of fatty acids in their diet.
    Keywords: Aquaculture ; Iran ; Acipenser persicus ; Nereis diversicolor ; Growth ; Survival ; Fatty acids ; Larvae ; Feeding ; Persian sturgeon ; Zooplankton ; Dissolved oxygen ; Temperature ; pH ; SGR
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 69
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...