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  • 1
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    Diet composition of the Persian sturgeon Acipenser persicus at the coast of the Guilan Province, Caspian Sea (2009)
    Springer
    Details
    Publication Date: 2009-07-01
    Print ISSN: 1063-0740
    Electronic ISSN: 1608-3377
    Topics: Biology
    Published by Springer
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  • 2
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    Releasing of Sturgeon Fingerlings from Shahid Beheshti rearing and propagation center and Yousefpour Hatchery in 1999 (2018)
    Details
    Publication Date: 2021-05-19
    Description: During 1999, Shahid Beheshti & Yousefpour hatcheries were released 6499769 fingerlings produced by 225 female spawners from 1999.5.28 to 1999.7.26. Totally 2458667 fingerlings released from Shahid Beheshti hatchery which consisted of 2360490 specimen of Acipenser persicus (96% frequency) with mean weight of 1.8 g and 7.6 cm length, 86177 specimen of Acipenser stellatus (3.5% frequency) with mean weight of 3.9 g and 11.2 cm length, 1200 specimen of Acipenser nudiventris (0.5% frequency) with mean weight of 3.6 g and 8.7cm length. Out of the total numbers of fingerlings released 82.4% of A. persicus, 45% of A. stellatus & 25% of A. nudiventris fingerlings were below 3g. The survival rate of A. persicus & A. stellatus were 33.7% and 32.0%, respectively. The result of study on growth coefficient and condition factor showed these fingerlings had low growth coefficient (4.89) and mean condition factor (04). In Yousefpour hatchery 4020002 sturgeon fingerlings were released consist of 3968262 specimen of A. persicus (99.4% frequency) with mean weight of 3.1 g and 8.9cm length, 51740 specimen of A. stellatus (0.6% frequency) with mean weight of 0.9g & 6.3cm length. Out of total number of released 61.7% of A. persicus and 100% Of A. stellatus were below 3g. The total Survival rate of A. persicus & A. Stellatus fingerlings were 46.3 and 28.4%, respectively. The experiments Showed that the growth coefficient and condition factor were low, 3.64 and 0.37, respectively. The results of comparing the mean quality of A. persicus between Shahid beheshti & Yousefpour (P0.05) showed that there is a significant difference among length, weight, condition factor & growth coefficient of these 2 hatcheries in a way that the fingerlings released from Yousefpour rearing and propagation center had better condition in terms of length and weight but, their growth coefficient and Condition factor were lower than A. persicus fingerlings in Shahid Beheshti hatchery.
    Description: Published
    Keywords: Sturgeon ; Fingerlings ; Rearing ; Hatchery ; Spawner ; Acipenser persicus ; A. stellatus ; A. nudiventris ; Specimen ; Acipenser stellatus ; Acipenser nudiventris ; A. persicus ; Weight ; Length ; Survival rate
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.149-158
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  • 3
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    Study on feeding habits of Sturgeon in the Caspian Sea up to 10m depth (Guilan Province) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: An understanding of the various conditions and characteristics in sturgeon nutrition can be useful in biological studies as well as in rearing them in inland waters. This project was conducted in order to study the feeding habits and various indices of nutrition in sturgeons in the southern shores of the Caspian Sea up the depth of 10 m. The study area was located in the Gilan Province between the city of Chaboksar (East Gilan) and Astara (West Gilan). Premature and mature sturgeon specimens were collected from 7 fishing cooperative societies located 30 to 35 Km away from each other. The weight and length of mature sturgeon specimens caught at depths less than 10 m were recorded at the catch stations adjacent to the cooperative societies. Following this the alimentary canal of these specimens was removed and fixed in 4 % formalin and then transferred to the biology department of the International Sturgeon Research Institute. Trawl nets with a 9 m wide opening were drawn using motor boats at each stations with replication. Totally 339 premature sturgeons (below 1 year, 1 year and 2 year old) and 52 sturgeon brood fishes with an average age of 11 years were examined. Among the premature sturgeons studied, 121 Acipenser persicus specimens showed full stomachs (57.17 % fullness) and lay within the length range of 10 to 49.9 cm whereas among the mature specimens studied, 3 A. persicus specimens showed full stomachs (11.54 % fullness) and lay within the length range of 48.1 to 194 cm and thus showed the highest Jyecles. The highest gut index in this study belonged tc premature A. persicus.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Main prey ; Secondary prey ; Condition factor ; Gastro somatic index ; Feeding intensity
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 79pp.
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  • 4
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    Feeding habits of sturgeon fishes in shallow coastal waters of Guilan Province, southern Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: We collected sturgeon specimens from seven fishing stations operating 30 to 35 Km away from each other in Guilan province over the years 1999 MD 2000. Trawl nets six meters long were drawn using motorboats at each station, repeated three times for each season. Among the studied premature sturgeons, 121 Acipenser persicus specimens with an average age of less than two years and a length of 10 to 49.9 ± 0.77 cm showed full stomachs (57.17 % fullness). Among the mature specimens with an average age of 11 years and a length range of 90 to 194 cm, only three showed full stomachs (11.54 % fullness). The highest gut index in this study belonged to premature A. persicus. A one-way analysis of variance showed no significant difference in condition factor and gastro-somatic index among the different length groups (P〈0.05). We found that the food consumed by premature A. persicus was comprised of eight genera of benthic invertebrates Hypania sp., Hypaniola sp., Pterocuma sp., Stenocuma sp., Abra ovata, Paramysis sp., Gammarus sp. and Nereis sp. Adult sturgeons were found feeding mainly on fish species belonging to Gobidae, Atherinidae and Clupeidae families. The main preys of premature A. persicus were polychaet worms Hypania sp. and Hypaniola sp. belonging to the class Sedantaria. Crustaceans Stenocuma sp. and Pterocuma sp. of the class Cumacea were also seen in the diet of the premature sturgeons. The main preys of adult A. persicus were fishes belonging to the family Gobiidae and secondary prey were fishes of the family Atherinidae.
    Description: Published
    Keywords: Acipenseridae ; Acipenser persicus ; Hypania sp. ; Hypaniola sp. ; Pterocuma sp. ; Stenocuma sp. ; Paramysis sp. ; Gammarus sp. ; Nereis sp. ; Atherinidae ; Feeding ; Benthic
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.37-48
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  • 5
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    The effects of temperature, salinity and photoperiod on sexual maturity and concomitant reproduction behavior in Nereis diversicolor (2018)
    Details
    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
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  • 6
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    Stock assessment of Sturgeon fishes in the southern part of Caspian Sea (Iranian water) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    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.
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  • 7
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    Summer and winter feeding behavior in Acipenser persicus and Acipenser stellatus in the south Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: Feeding behavior in Acipenser persicus and Acipenser stellatus in summer and winter was studied from 2004 to 2006 simultaneously with the marine survey for sturgeon stock assessment. Bottom trawls (9m) on board the research vessel Sisara 2 (50 hsp) were used to collect specimens at depth below 10m, while specimens at depths more than 10m were collected using bottom trawls (24.7m) on board the Guilan Research Vessel (1000 hsp). Examination of stomach contents of 135 A. persicus and 80 A. stellatus specimens revealed that the food spectrum was composed of bony fishes (Neogobius sp., Atherina sp., Clupeonella cultriventris), invertebrates belonging to the family Ampharitidae (polychaeta worms including Hypanai sp. and Nereis diversicolor), various crustaceans (Gammarus sp. and Paramysis sp.) and the bivalved mollusc, (Abra ovate). Significant differences were detected in the frequency of prey items in the different seasons studied. Also significant differences (P0.05).
    Description: Published
    Keywords: Food organisms ; Stomach content ; Anadromous species ; Bottom trawls ; Stock assessment ; Trawl nets ; Neogobius ; Polychaeta ; Nereis diversicolor ; Acipenser stellatus ; Paramysis ; Acipenser ; Acipenser persicus ; Abra ; Atherina ; Brackish ; Feeding behaviour ; Marine molluscs ; Taxonomy ; Marine crustaceans ; Winter ; New species
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.13-26
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  • 8
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    Study of Possibility of Reproduction and Mass Culture of Nereis diversicolor (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The present study was firstly conducted to study the rate of sexual maturity in Nereis diversicolor under suitable conditions of temperature and photoperiod. The second objective was to determine the potential of artificial breeding in these worms for mass culture. Nereis diversicolor worms were collected from the Anzali lagoon in 4000 sampling operations during the years 2004 to 2006 using Ekman grab with a surface area of 400 cm2. The water salinity, temperature and total organic matter (TOM) of sediments in the sampling region was recorded. The worms were maintained in 0.5 tons (1 x 1 m2) tanks containing clayey-muddy sediment to a height of 20 cm covered with 10 cm water (5 ‰) until they reached a weight of 200-300 mg. Sexual maturity in this species was attained at 4-6 ºC and spawning occurred at approximately 16 ºC. The first gametes were observed five weeks after the temperature increased from 6 to 16 ºC. Sexual maturity was studied at various salinities (0.5, 5, 12, and 15 ‰). Results indicate that these worms attained earlier sexual maturity at salinity of 15 ‰, compared to other salinities studied. No significant differences (P〉0.05) were observed between sexual maturity attained at 12 ‰ and 15 ‰. Stocking density (20, 50, 100, 150 worms) was studied in terms of sex and showed that number of females were higher than males and the ratio was 11:1 (female:male). No significant differences (P〉0.05) were observed between the various stocking densities and their replicates. The effect of light and photoperiod in synchronizing reproduction in male and female N. diversicolor was studied. It was evident that reproduction behavior in adult worms increased for a period of one week at the end of each month after they are exposed to a prolonged photoperiod (L:D=16:8) followed by a period of dim light (simulated using 1 W lamps). Feeding trials were carried out with Saccharomyces cerevisiae, formulated fish diets and humus. Results showed that this diet was effective in speeding up sexual maturity in worms and significant effect of treatment was observed (P〈0.05) in worms fed a diet of humus alone. Eggs and sperms were fertilized and worms developed from the young monotrochophore with jelly layer to the trochophore larvae.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Reproduction ; Sexual Maturity ; Fertilization ; Nereis Diversicolor ; Culture ; Salinity ; Temperature ; Spawning ; Female ; Male ; Larvae ; Sacchromyces cerevisiae ; Density
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 68pp.
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  • 9
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    Study on probable natural reproduction in Sturgeon of the south Caspian Sea in the Sefidrud River (2018)
    Details
    Publication Date: 2021-05-19
    Description: Sturgeon are considered one of the most valuable fishes of the world that migrate to the rivers leading to the Caspian Sea, including the Sefirud River, to spawn. In the post this river was known as the reservoir for millions of sturgeon larvae, but at present due to illegal fishing in the river and the construction of the Tarik Dam, Manjil Dam and the Sangar Dam in the migratory route of these fishes and so also the decrease in the water flow of this river, it is losing its popularity. In order to study the natural reproduction of sturgeon in the river, an attempt to find larvae of different species of sturgeon was made from 19 May, 1996 to 13 June 1996. Six sampling stations were located from the beginning of the Sangar Dam as far as the sea shore (about 40 Km) for this purpose. Different methods of catch were employed including beach seine nets (mesh size 1, 4 and 8mm). “CALO” a local fishing effort (mesh size 4mm) and conical nets (mesh size 1 and 4 mm). On the whole out of 268 times that nets were cast, 1853200 Km of the study area was survey and totally 514500 fishes belonging to the fallowing species were caught. Liza auratus, Chalcalburnus chalcoides, Varicorhinus capoeta, Cobitis sp., Esox lucius, Silurus glanis, Abramis baranta, Carassius auratus, Cyprinus carpio, Tinca tinca, Stizostedion lucioperca , Alosa caspia , Syngnathus nigrolineatus, Barbus sp. , Anthemia boyeri, Pungitius platygaster and Gobius sp. No larvae of sturgeons were observed during this study. Although 218 brood fishes were caught in the Sefirud River in 1996, due to fishing pressure, illegal fishing, deterioration of spawning grounds and restrictions in the migratory route resulting from the construction of dams, no signs of natural reproduction were observed in the Sefirud River. Therefore it can be concluded that even if natural reproduction did take place in the Sefidrud River, the incidences were very low.
    Description: Published
    Keywords: Sturgeon ; Larvae ; Species ; Conical nets ; Survey ; Liza auratus ; Chalcalburnus chalcoides ; Varicorhinus capoeta ; Cobitis sp . ; Esox lucius ; Silurus glanis ; Abramis baranta ; Carassius auratus ; Cyprinus carpio ; Tinca tinca ; Stizostedion lucioperca ; Alosa caspia ; Syngnathus nigrolineatus ; Barbus sp. ; Anthemia boyeri ; Pungitius platygaster ; Gobius sp. ; Spawning ; Migratory
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.69-82
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  • 10
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    Feeding habits of sturgeon fishes in shallow coastal waters of Guilan Province, southern Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: We collected sturgeon specimens from seven fishing stations operating 30 to 35 Km away from each other in Guilan province over the years 1999- 2000. Trawl nets six meters long were drawn using motorboats at each station, repeated three times for each season. Among the studied premature sturgeons, 121 Acipenser persicus specimens with an average age of less than two years and a length of 10 to 49.90.77 cm showed full stomachs (57.17 % fullness). Among the mature specimens with an average age of 11 years and a length range of 90 to 194 cm, only three showed full stomachs (11.54 % fullness). The highest gut index in this study belonged to premature A. persicus. A one-way analysis of variance showed no significant difference in condition factor and gastro-somatic index among the different length groups (P〈0.05). We found that the food consumed by premature A. persicus was comprised of eight genera of benthic invertebrates Hypania sp., Hypaniola sp., Pterocuma sp., Stenocuma sp., Abra ovata, Paramysis sp., Gammarus sp. and Nereis sp. Adult sturgeons were found feeding mainly on fish species belonging to Gobidae, Atherinidae and Clupeidae families. The main preys of premature A. persicus were polychaet worms Hypania sp. and Hypaniola sp. belonging to the class Sedantaria. Crustaceans Stenocuma sp. and Pterocuma sp. of the class Cumacea were also seen in the diet of the premature sturgeons. The main preys of adult A. persicus were fishes belonging to the family Gobiidae and secondary prey were fishes of the family Atherinidae
    Description: Published
    Keywords: Feeding ; Sturgeon ; Acipenseridae ; Specimens ; Acipenser persicus ; Mature ; A. persicus ; Hypania sp. ; Hypaniola sp. ; Pterocuma sp. ; Stenocuma sp. ; Abra ovata ; Paramysis sp. ; Gammarus sp. ; Nereis sp. ; polychaet ; Gobiidae ; Atherinidae
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.37-48
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