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  • 1
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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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  • 2
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    Estimation fisheries Return of Sturgeon fishes with use of tagging method (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: To understand fisheries return of sturgeon fishes a project with use of tagging method was approved in 1997 and its first phase started in 1999. Total of 266796 juveniles of Persian sturgeon, stellate sturgeon, Russian sturgeon, ship and Huso huso in 3 weight categories of under 3 gr., 3-5 gr. and over 5 gr. were tagged in the Shaheed Dr. Beheshti, Shaheed Marjani and Shaheed Rajayee sturgeon hatcheries were tagged using CWT tags and released into the rivers entering the Caspian Sea. Other than CWT tags some 192000 juvenile of Persian sturgeon, Russian sturgeon and ship sturgeons between 2-10gr. weight were tagged by barbel dissection. Trawl, gill net and beach seines were used to catch tagged sturgeons at the depths below 10 meters in the Caspian Sea. Trawling was carried out in 2000- 2001 and 35 juvenile of Persian sturgeon and 8 juvenile of stellate sturgeon were caught however none of them carried CWT tags. Gill net was sued in 2002 in Gilan and 2003 in Mazandaran and Golestan provinces and total of 1690 fish were caught including 1562 persian sturgeon, 99 stellate sturgeon, 17 ship sturgeon, 8 Russian sturgeon and 4 Husu huso. Nine specimens of Persian sturgeon over 5 gr. 11 specimens between 3- 5 gr. and 6 specimens below 3 gr. and 2 specimens of stellate sturgeon over 5 gr. were found to carry CWT tags. Based on formulas used for estimation of fish population, number of juvenile Persian sturgeon and stellate sturgeon in coastal areas of the Caspian Sea were estimated to be 1317750 and 470000 in 2002 and 5452772 and 91000 in 2003 respectively (calculations were based on CTW tags). Number of Persian sturgeon caught in beach seine in Gilan province in 2003 (1 st October- -21st December) was 2978 of which 37 specimens had their barbel dissected. Based on the formulas number of sturgeon juveniles in Gilan below 10 m in the year 2003 (with dissected barbel) estimated to be 4420000. Considering number of fish caught with dissected barbel this method along with CTW tagging method could be used as a tagging method to study fisheries return. As for suitable weight for release the obtained data (taking into account the limited duration of tagging and sampling) were not enough and the obtained results could be used as guideline for further work.
    Description: Published
    Keywords: Sturgeon fishes ; Tagging ; CTW ; Barbel dissection ; Huso huso ; Estimation ; Method
    Repository Name: AquaDocs
    Type: Report Section , Refereed
    Format: 78pp.
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  • 3
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    Study on genetic structure of Caspian Sea Sturgeons in the Stock assessment of Sturgeon in Iranian coastline of the south Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The population genetic structure of the Persian sturgeon (Acipenser persicus) in the 2, 3, 4 fisheries regions and Sefidrud River was investigated based on the DNA sequencing method during 2010 – 2013 sturgeon stock assessment in the south Caspian Sea . DNA samples were extracted using ammonium acetate, the quantity of DNA was measured at 260 and 280 nm using spectrophotometry by Nanodrop (ND 1000 model), and the quality was checked by 1% agarose gel electrophoresis. Two sets of mitochondrial gene (D-loop and cytochrom b) after synthesis were used for polymerase chain reaction (PCR). A Neighbor-Joining (NJ) tree was constructed for all haplotypes according to Kimura 2-parameter model using Mega Version 4.0.1, number of haplotypes, haplotype diversity (Hd) and nucleotide diversity and their corresponding variances, genetic divergence overall and between paired populations (Fst) by 10,000 permutations and exact test, the gamma distribution shape parameter for the rate heterogeneity among sites and nucleotide sequence, the historical demographic pattern of A.persicus using neutrality tests and mismatch distribution analysis (D test of Tajima and Fs test of Fu), also the concordance of the observed with the expected distribution under the sudden population model using the Harpending, s raggedness index (Hri) were analysed. All calculations were conducted using ARLEQUIN version 3.11 and DnaSP 4.0. The aligned mtDNA sequences of D-loop and cytochrom b genes were consisted of 500 and 700 base pairs (bp) respectively. 13 and 4 haplotypes were defined, the average haplotype diversity were 0.961 and 0.419, average nucleotide diversity were 0.038 and 0.002, The gamma distribution shape parameter were 0.19 and 0.20 indicating moderate mutation rate heterogeneity among sites in A.persicus. The lowest value of Fst for D-loop gene was calculated between Sefidrud and four fisheries region (-0.002) and the Fst values observed for cytochrom b gene was 0.04 with Nm=5.37 and not statistically significant. The exact test of population differentiation (non-differentiation exact P values) showed significant differences between Sefidrud and other areas (P ≤0.05) for D-loop gene and for cytochrom b gene was nonsignificant (P ≥0.05). The mismatch analysis produced a unimodal distribution of pairwise differences for both genes which was consistent with the sudden population expansion model. Tajima’s D and Fu’s Fs statistics were significantly negative (D= -0.84 and - 0.99, P〉0.01; Fs= -0.220 and -0.079, 〉0.01). ARLEQUIN calculated the value of t as 13.65 and the time since population expansion was estimated to be approximately 1501 years before present based on the mutation rates for the control region and this value for cytochrom b gene t= 0.98 which population expansion time was 7.84 years before present. The results of this study based on D-loop gene showed that population of A.persicus in the Sefidrud River is differ from other studied areas. Therefore fisheries managements of this unique and valuable stock for restocking and conservation of gene pools is strongly recommended.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Genetic ; Structure ; Sturgeons ; Stock assessment
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 69pp.
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  • 4
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    Unknown
    Stock assessment of sturgeon fishes in the southern part of Caspian Sea (Iranian water) (2021)
    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
    Details
    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
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  • 5
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    Study on genetic structure of Caspian Sea sturgeons in the stock assessment of sturgeon in Iranian coastline of the south Caspian Sea (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25465 | 18721 | 2018-09-26 09:39:43 | 25465 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: The population genetic structure of the Persian sturgeon (Acipenser persicus) in the 2, 3, 4 fisheries regions and Sefidrud River was investigated based on the DNA sequencing method during 2010–2013 sturgeon stock assessment in the south Caspian Sea . DNA samples were extracted using ammonium acetate, the quantity of DNA was measured at 260 and 280 nm using spectrophotometry by Nanodrop (ND 1000 model), and the quality was checked by 1% agarose gel electrophoresis. Two sets of mitochondrial gene (D-loop and cytochrom b) after synthesis were used for polymerase chain reaction (PCR). A Neighbor-Joining (NJ) tree was constructed for all haplotypes according to Kimura 2-parameter model using Mega Version 4.0.1, number of haplotypes, haplotype diversity (Hd) and nucleotide diversity and their corresponding variances, genetic divergence overall and between paired populations (Fst) by 10,000 permutations and exact test, the gamma distribution shape parameter for the rate heterogeneity among sites and nucleotide sequence, the historical demographic pattern of A.persicus using neutrality tests and mismatch distribution analysis (D test of Tajima and Fs test of Fu), also the concordance of the observed with the expected distribution under the sudden population model using the Harpending, s raggedness index (Hri) were analysed. All calculations were conducted using ARLEQUIN version 3.11 and DnaSP 4.0. The aligned mtDNA sequences of D-loop and cytochrom b genes were consisted of 500 and 700 base pairs (bp) respectively. 13 and 4 haplotypes were defined, the average haplotype diversity were 0.961 and 0.419, average nucleotide diversity were 0.038 and 0.002, The gamma distribution shape parameter were 0.19 and 0.20 indicating moderate mutation rate heterogeneity among sites in A.persicus. The lowest value of Fst for D-loop gene was calculated between Sefidrud and four fisheries region (-0.002) and the Fst values observed for cytochrom b gene was 0.04 with Nm=5.37 and not statistically significant. The exact test of population differentiation (non-differentiation exact P values) showed significant differences between Sefidrud and other areas (P ≤0.05) for D-loop gene and for cytochrom b gene was nonsignificant (P ≥0.05). The mismatch analysis produced a unimodal distribution of pairwise differences for both genes which was consistent with the sudden population expansion model. Tajima’s D and Fu’s Fs statistics were significantly negative (D= -0.84 and - 0.99, P〉0.01; Fs=-0.220 and -0.079, 〉0.01). ARLEQUIN calculated the value of t as 13.65 and the time since population expansion was estimated to be approximately 1501 years before present based on the mutation rates for the control region and this value for cytochrom b gene t= 0.98 which population expansion time was 7.84 years before present. The results of this study based on D-loop gene showed that population of A.persicus in the Sefidrud River is differ from other studied areas. Therefore fisheries managements of this unique and valuable stock for restocking and conservation of gene pools is strongly recommended.
    Keywords: Biology ; Iran ; Caspian Sea ; Genetic ; Structure ; Sturgeons ; Stock assessment
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 69
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