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  • A. nudiventris  (4)
  • CWT  (2)
  • 1
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    Unknown
    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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  • 2
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    Unknown
    Study on moving direction and survival index of Persian sturgeon (Acipenser persicus) fingerlings using mark-recapture method in Caspian Sea (Guilan province coasts) (2017)
    Details
    Publication Date: 2021-05-19
    Description: To study moving direction and survival index of Persian sturgeon fingerlings, a total of 390200 individuals of the fish in three weight classes: less than 3g, 3 to 5g and 6 to10g were marked by coded wire tags (CWT) during 2003 to 2008. In 2003, 101500 of these individuals were marked in Shahid Beheshti, Shahid Rajaee and Shahid Marjani Sturgeon Rearing Centers, in north of Iran and then released in Sephidrud, Tajan and Gorganrud rivers. During 2004 to 2008, 288700 pieces were marked by Shahid Beheshti Rearing Centers and released in Sephidrud River. Catch and detection of fingerlings carried out by gill net prepared from nylon with mesh sizes 22, 26, 33 (2 filaments for each mesh) and one 40mm mesh size. Totally, 175 meters of net was used to study fishes in waters under 10m depth in Guilan province. In all, 2827 pieces of this fish were caught of which 40 had CWT and these belonged to weight classes 6-10g (22 pieces), 3-5g (17 pieces) and under 3g (one piece). Results on release and catch of the fingerlings for Sephirud River showed that more than 70% of fingerlings moved to eastern parts of the estuary and eastern coasts of Guilan province (stations like 12 Bahman, Dastak and Chaboksar). Of the fingerlings released in Gorganrud and Tajan rivers, only one piece was caught in Chaboksar and another in Lisar after 15 months. Hence, we postulated that the fingerlings released in Mazandaran and Golestan provices migrated to Guilan province coasts. Statistical analysis of the survival index in different weight classes indicated that the class 6-10g had higher survival rate, twice than class 3-5g and 20 times more than that of the class under 3g. Considering these results, probably the higher weight at release time can be effective in increasing the survival rate of the Persian sturgeon fingerlings.
    Description: Published
    Keywords: Acipenser persicus ; Stock assessment ; CWT ; Persian sturgeon fingerlings ; Migration ; Survival index ; Survival ; Persian sturgeon ; Fingerlings ; Methodology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.75-86
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  • 3
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    Unknown
    Variations in sturgeon populations in the coastal waters of the Caspian Sea (Guilan province) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The present study was conducted from autumn 2003 to summer 2005 with the objective to estimate distribution and relative abundance in different species of sturgeons as a function of seasons, and regions in the west coast of the Caspian Sea (Guilan province).Gillnets with a different mesh sizes (26, 33, 40, 60, 100, and 150 mm) were set up at different depths(2, 5, and 10 m) for 24 h. Data on variations in catch, catch per unit effort(CPUE) and length and age composition of sturgeon species were analyzed statistically. Data on CPUE in each region and depth and mean estimates of length and age in fish were reported for each season and each year of the study period. CPUE during 2004-2005 was 1.32 fish which was 30.1% lower than CPUE (1.89 fish) recorded in 2003-2004.CPUE for all species except A. nudiventris decreased during 2004-2005 as compared to that in 2003-2004. Acipenser persicus caught during 2003-2004 and 2004-2005 ranged from 15 to 45 cm in length and comprised 91.1 and 97.1% respectively of the total sturgeon catch. These fish belonged to the one year age class. Mean length recorded in sturgeon fish caught in 2004-2005 decreased as compared to that recorded in 2003-2004. Significant differences were recorded in total length of fish caught in 2003-2004 and 2004-2005. Results obtained from the present study reveal that the abundance of fish increased from west to east indicating a direct relationship between the general currents found in the Caspian Sea and the higher density of nutrients in the eastern region.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Stock ; Sturgeons ; Gillnets ; CPUE ; Fish ; Species ; A. nudiventris ; Acipenser persicus ; Length ; Nutrients ; Costal waters
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 59pp.
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  • 4
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    Unknown
    Releasing of sturgeon fingerlings from Shahid Beheshti rearing and propagation center and Yousefpour hatchery in 1999 (2021)
    In:  http://aquaticcommons.org/id/eprint/24131 | 18721 | 2018-08-03 08:04:27 | 24131 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    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.
    Keywords: Aquaculture ; Acipenser persicus ; A. stellatus ; A. nudiventris ; Rearing ; Fingerlings ; Spawner ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 149-158
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  • 5
    facet.materialart.
    Unknown
    Study on moving direction and survival index of Persian sturgeon (Acipenser persicus) fingerlings using mark-recapture method in Caspian Sea (Guilan province coasts) (2021)
    In:  http://aquaticcommons.org/id/eprint/21852 | 18721 | 2018-01-14 19:36:11 | 21852 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-03
    Description: To study moving direction and survival index of Persian sturgeon fingerlings, a total of 390200 individuals of the fish in three weight classes: less than 3g, 3 to 5g and 6 to10g were marked by coded wire tags (CWT) during 2003 to 2008. In 2003, 101500 of these individuals were marked in Shahid Beheshti, Shahid Rajaee and Shahid Marjani Sturgeon Rearing Centers, in north of Iran and then released in Sephidrud, Tajan and Gorganrud rivers. During 2004 to 2008, 288700 pieces were marked by Shahid Beheshti Rearing Centers and released in Sephidrud River. Catch and detection of fingerlings carried out by gill net prepared from nylon with mesh sizes 22, 26, 33 (2 filaments for each mesh) and one 40mm mesh size. Totally, 175 meters of net was used to study fishes in waters under 10m depth in Guilan province. In all, 2827 pieces of this fish were caught of which 40 had CWT and these belonged to weight classes 6-10g (22 pieces), 3-5g (17 pieces) and under 3g (one piece). Results on release and catch of the fingerlings for Sephirud River showed that more than 70% of fingerlings moved to eastern parts of the estuary and eastern coasts of Guilan province (stations like 12 Bahman, Dastak and Chaboksar). Of the fingerlings released in Gorganrud and Tajan rivers, only one piece was caught in Chaboksar and another in Lisar after 15 months. Hence, we postulated that the fingerlings released in Mazandaran and Golestan provices migrated to Guilan province coasts. Statistical analysis of the survival index in different weight classes indicated that the class 6-10g had higher survival rate, twice than class 3-5g and 20 times more than that of the class under 3g. Considering these results, probably the higher weight at release time can be effective in increasing the survival rate of the Persian sturgeon fingerlings.
    Keywords: Biology ; Fisheries ; Stock assessment ; CWT ; Persian sturgeon fingerlings ; Survival index ; Migration ; Acipenser persicus ; Guilan province ; Caspian Sea ; iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 75-86
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  • 6
    facet.materialart.
    Unknown
    Variations in sturgeon populations in the coastal waters of the Caspian Sea (Guilan province) (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25106 | 18721 | 2018-08-23 05:36:01 | 25106 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: The present study was conducted from autumn 2003 to summer 2005 with the objective to estimate distribution and relative abundance in different species of sturgeons as a function of seasons, and regions in the west coast of the Caspian Sea (Guilan province).Gillnets with a different mesh sizes (26, 33, 40, 60, 100, and 150 mm) were set up at different depths(2, 5, and 10 m) for 24 h. Data on variations in catch, catch per unit effort(CPUE) and length and age composition of sturgeon species were analyzed statistically. Data on CPUE in each region and depth and mean estimates of length and age in fish were reported for each season and each year of the study period. CPUE during 2004-2005 was 1.32 fish which was 30.1% lower than CPUE (1.89 fish) recorded in 2003-2004.CPUE for all species except A. nudiventris decreased during 2004-2005 as compared to that in 2003-2004. Acipenser persicus caught during 2003-2004 and 2004-2005 ranged from 15 to 45 cm in length and comprised 91.1 and 97.1% respectively of the total sturgeon catch. These fish belonged to the one year age class. Mean length recorded in sturgeon fish caught in 2004-2005 decreased as compared to that recorded in 2003-2004. Significant differences were recorded in total length of fish caught in 2003-2004 and 2004-2005. Results obtained from the present study reveal that the abundance of fish increased from west to east indicating a direct relationship between the general currents found in the Caspian Sea and the higher density of nutrients in the eastern region.
    Keywords: Fisheries ; Iran ; Caspian Sea ; Guilan Province ; Stock ; Sturgeons ; Gillnets ; CPUE ; Fish ; Species ; A. nudiventris ; Acipenser persicus ; Length ; Nutrients ; Costal waters
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 59
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