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  • Articles  (21)
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  • 1
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    The survey statistical and biological of sturgeon in the southern Caspian Sea (Mazandaran waters) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This study have been conducted entitle biological and statistical sturgeon in the southern Caspian Sea (Mazandaran waters)” from 2009 to 2013. Sampling was manthly. Overal, 1859 specimens of different species of sturgeon was caught including Acipenserpersicus (69%), A. stellatus (19%), Husohuso (6%), A. nudiventris (4%) and A. guldenstaedtii (2%). Totally, the meat and caviar of five species were found 53263.6 kg and 5633 kg respectively and caviar to meat ratio was 10.6%. The results show that ration of meat and caviar whole species reduced from 2009 to 2012 in which the meat and caviar of A. persicus was declined from 12146 to 4465 kg in meat and caviar from 1358 to 487 kg were extremely reduced respectively. The CPUE (catch per unit effort) of sturgeon has fluctuated from 2009 to 2012. Totally, the CPUE of A. persicus was decreased from 0.150 (2009) to 0.130 (2012) kg boat per day, A. stellatue from 0.009 (2009) to 0.021 (2012) kg boat/day, A. guldenstaedtii from 0.002 (2009) to 0.003 (2012) kg boat/day, A. nudiventris from 0.027 (2009) to 0.001 (2012) kg boat/day and H. huso from 0.123 (2009) to 0.018 (2012) kg boat /day. 1061 specimens of fish has been caviar including A. persicus with 69%, A. stellatus (18.1%), H. huso (5.5%), A. guldenstaedtii (2.7%). The frequency of caviar categorize was included 1 , 2, 3 and massive with 49.6%, 38%), 10.6% and 1.9% , respectively. The highest of meat and caviar belong to A. persicus with 31414 kg and 3515.7 kg, respectively were found and the lowest was 841kg and 105.9 kg pertain to A. guldenstaedtii. The results show that 65.9% of sturgeon was caught by legal catch (landing) and 34.1% by beach seine remained. 391 individuals was age determined that the minimum and maximum age was 9 and 41 year comprised to H.huso and A. stellatus, respectively. A. persicus and A. stellatus were majority caught compare to other species. A. persicus has the highest frequency in 14-15 year age groups with 50% and 57% in 2009 and 2011, respectively and 15-16 year age group with 41% and 56% in 2010 and 2012, respectively. The results show that mean of fork length, body weight, caviar weight of A. persicus was declined because the FL and weight average (±SD) obtained from 152.4±16.7cm and 25.8±9.2 kg in 2009 to 146.5± 18.7cm and 22.1±9.2kg in 2012, respectively. In contrast, the average (±SD) FL and weight of H. huso was increased from 218.8±41.1cm and 137.3±96.6kg in 2009 to 231.3±45.2cm in FL and 146.2±78.5kg body weight in 2012, respectively. Consequently, the results show that stocks of sturgeon in the Caspian Sea has a trend declined because of some species in IUCN categorize list was Endangered in 2006 but at this moment lie in Critically Endangered list of IUCN categorize were down which could be a serious alarm for the valuable sturgeon fish in the Caspian Sea. Therefore, recommendation that trade catch of sturgeon in the Caspian Sea must be forbidden and continue legal catch for spawner fish that needede to artificial propagation only.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biological ; Biology ; Sturgeons ; A. persicus ; A. stellatus ; A. guldenstaedtii ; A. nudiventris ; H. huso ; CPUE ; Survey ; Sampling ; Species ; Caviar
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 136pp.
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  • 2
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    The survey statistical and biological of sturgeon in the southern Caspian Sea (Mazandaran waters) (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25582 | 18721 | 2018-10-07 10:46:51 | 25582 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: This study have been conducted entitle biological and statistical sturgeon in the southern Caspian Sea (Mazandaran waters)” from 2009 to 2013. Sampling was manthly. Overal, 1859 specimens of different species of sturgeon was caught including Acipenserpersicus (69%), A. stellatus (19%), Husohuso (6%), A. nudiventris (4%) and A. guldenstaedtii (2%). Totally, the meat and caviar of five species were found 53263.6 kg and 5633 kg respectively and caviar to meat ratio was 10.6%. The results show that ration of meat and caviar whole species reduced from 2009 to 2012 in which the meat and caviar of A. persicus was declined from 12146 to 4465 kg in meat and caviar from 1358 to 487 kg were extremely reduced respectively. The CPUE (catch per unit effort) of sturgeon has fluctuated from 2009 to 2012. Totally, the CPUE of A. persicus was decreased from 0.150 (2009) to 0.130 (2012) kg boat per day, A. stellatue from 0.009 (2009) to 0.021 (2012) kg boat/day, A. guldenstaedtii from 0.002 (2009) to 0.003 (2012) kg boat/day, A. nudiventris from 0.027 (2009) to 0.001 (2012) kg boat/day and H. huso from 0.123 (2009) to 0.018 (2012) kg boat /day. 1061 specimens of fish has been caviar including A. persicus with 69%, A. stellatus (18.1%), H. huso (5.5%), A. guldenstaedtii (2.7%). The frequency of caviar categorize was included 1 , 2, 3 and massive with 49.6%, 38%), 10.6% and 1.9% , respectively. The highest of meat and caviar belong to A. persicus with 31414 kg and 3515.7 kg, respectively were found and the lowest was 841kg and 105.9 kg pertain to A. guldenstaedtii. The results show that 65.9% of sturgeon was caught by legal catch (landing) and 34.1% by beach seine remained. 391 individuals was age determined that the minimum and maximum age was 9 and 41 year comprised to H.huso and A. stellatus, respectively. A. persicus and A. stellatus were majority caught compare to other species. A. persicus has the highest frequency in 14-15 year age groups with 50% and 57% in 2009 and 2011, respectively and 15-16 year age group with 41% and 56% in 2010 and 2012, respectively. The results show that mean of fork length, body weight, caviar weight of A. persicus was declined because the FL and weight average (±SD) obtained from 152.4±16.7cm and 25.8±9.2 kg in 2009 to 146.5± 18.7cm and 22.1±9.2kg in 2012, respectively. In contrast, the average (±SD) FL and weight of H. huso was increased from 218.8±41.1cm and 137.3±96.6kg in 2009 to 231.3±45.2cm in FL and 146.2±78.5kg body weight in 2012, respectively. Consequently, the results show that stocks of sturgeon in the Caspian Sea has a trend declined because of some species in IUCN categorize list was Endangered in 2006 but at this moment lie in Critically Endangered list of IUCN categorize were down which could be a serious alarm for the valuable sturgeon fish in the Caspian Sea. Therefore, recommendation that trade catch of sturgeon in the Caspian Sea must be forbidden and continue legal catch for spawner fish that needede to artificial propagation only.
    Keywords: Biology ; Ecology ; Iran ; Caspian Sea ; Mazandaran waters ; Biology ; Sturgeons ; A. persicus ; A. stellatus ; A. guldenstaedtii ; A. nudiventris ; H. huso ; CPUE ; Survey ; Sampling ; Species ; Caviar
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
    Format: 136
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  • 3
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    Population dynamic of bony fishes in the southern part of the Caspian Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to determine growth parameters, catch and fishing effort trends, stock assessment and Acceptable Biological Catch (ABC) of bony fishes in the Iranian coastal waters of Caspian Sea in the years 2010-2011 and 2011-2012. According to the result, the numbers of beach seines were 131 and 128 and their fishing efforts were observed 50184 and 42255 beach seining during 2010-11 and 2011-12, respectively. The catch per unit of effort CPUE) was calculated 182.9 and 205.6 kg/haul during two sampling periods, respectively. The total catches (including illegal fishing) were also obtained 16601.5 mt and 17034.1 mt during 2010-11 and 2011-12, respectively. The highest proportion of catch was belonged to kutum and golden grey mullet (86% and 88%, respectively) in two fishing seasons aforementioned above. Growth parameters of kutum were estimated as K=0.21/yr, L∞ = 60.0 cm, t0 = 0/yr. The Growth parameters were K=0.18/yr, L∞ = 61.1 cm, t0 = -0.14/yr for golden gray mullet and were K=0.12/yr, L∞ = 73.6 cm, t0 = 0.92/yr for common carp. Based on catch-at-age data, in the years 2010-2011 and 2011-2012, the total biomass, from the biomass-based cohort analysis were estimated 41700mt and 34400 mt for kutum and 14600 mt and 14400 mt for golden grey mullet, respectively. The reference points of F0.1 and F35% were 0.41/yr and 0.34/yr for kutum and 0.36/yr and 0.33/yr for golden grey mullet, respectively. Stock enhancement plays an important role in recovery of kutum stocks in the Iranian coastal waters of Caspian Sea. There is a significantly negative correlation between fingerlings released and condition factor (CF) and recruitment and CF. The different trends for fingerlings, recruitments and CF suggest that CF may be partly density-dependent, declining at high population sizes due to intra-specific competition. Therefore, more research should be conducted to determine the desirable level of artificial propagation. Food consumed by fish species, Rutilus frisii kutum, Rutilus rutilus caspicus, Cyprinus carpio, Liza auratus and Liza saliens were included Foraminifera, Porifera, Annelida, Mollusca, Arthropoda, filamentous algae, fish eggs and detritus.The results showed that Rutilusfrisii kutum generally feed on Balanus and Cerastorderma. The main food item for Cyprinuscarpio, Liza auratus and Liza salienswas detritus. Based on available models, the ABCs were estimated as 6600-7400 mt for kutum and 2200-2800 mt for golden grey mullet (with precautionary approach 6600 mt and 2200 mt for kutum and mullet, respectively) in 2011-12. Two species (kutum and golden grey mullet) are vulnerable to environmental factors, and these factors should be considered in the stock assessment and management of the fish. For two species, the ABC with a lower andmore accurate value based onmore information, should be selectedfor the implementation of a precautionary management approach.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Bony fishes ; Growth ; Mortality ; Biomass ; Acceptable biological catch ; Population ; Stock assessment ; Fishing ; Rutilus frisii kutum ; Rutilus rutilus caspicus ; Cyprinus carpio ; Liza auratus ; Algae ; Species
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 72pp.
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  • 4
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    Monitoring (biology and catch) of Kilka in Iranian commercial catch in 2001-2002 (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Kilka fish has been catch in Iranian coastal waters in Mazandaran and Giulan provinces. During in 1996 to 2000 Kilka fishing ships discharged theirs catch in three ports, Babolsar, Amirabad (in Mazandaran) and Anzali (in Giulan). In this investigation which had been done in commercial catch regions, in addition of biological characteristics survey such as species composition, length, weight, age, sexual and stages of sexual maturity, catch amount and catch per unit effort also were analyzed .The results shown that catch of kilka in Mazandaran and Gilan in 1999decreased from 28 and 57 thousand tons to 19.6 and 42.6 thousand tons, respectively. CPUE also decreased from 3900 kg in 1999 to 2500 kg in 2000.Between three species of kilka, anchovy dominated but the frequency of this fish decreased from 85-90% to 76% and the frequency of common kilka sharply increased. Common kilka had been caught in spring and summer but in 2000 this fish caught all months. Anchovy spawn in spring and autumn but mass spawning anchovy occurred in autumn. Spawning of common kilka occurred in spring and early summer. The length frequency of anchovy is close and the bigger fish did not see in catch. The average length of anchovy decreased from 96.3 mm in 1997 to 87.3 mm in 2000.Theage frequency had the same situation, as fish with 5+ and 6+ were not or had very low frequency. According to the reports mass group of Mnemiopsis leydei saw in 2000 in south of the Caspian. The animal damaged the pelagic stocks in Black Sea. Probably Mnemiopsis caused this mentioned characteristics in the Caspian Sea.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biology ; Catch ; Kilka ; CPUE ; Spawning ; Anchovy ; Common Kilka ; Mnemiopsis leidyi
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 53pp.
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  • 5
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    Monitoring (biology and catch) of kilka in Iranian commercial catch regions (2002-2005) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Through most of the last century, three endemic kilka species supported major commercial species in the Caspian Sea. It is clear that catches and abundance of all species have changed. Recent changes in the Caspian Sea ecosystem have occurred as a consequence of ecological change caused by the invasive ctenophore (Mnemiopsis leidyi). In this investigation which had been done in commercial catch regions during 2002-2004, in addition of biological characteristics survey such as species composition, length, weight, age, sex ratios and maturity stages; catch and catch per unit effort also were analyzed. During the years 2002-2004 the annual catches of kilka varied between 15000-25000 mt and CPUE varied between 1.077-1.474 mt (vessel×night). The frequency of anchovy kilka declined from 69.5% in 2002 to 26.9% in 2004. During the years 2002, 2003 and 2004 the frequency of common kilka were 30.4%, 48.9% and 71.9%, respectively. During this period the frequency of bigeye kilka was negligible. The average fork length of anchovy kilka increased from 100.4 mm in 2002 to 105.0 mm in 2004 and the average weight were 6.4 g and 8.4 g, respectively. The average fork length of common kilka increased from 87.0 mm in 2002 to 93.8 mm in 2004 and the average weight were 5.2 g and 7.4 g, respectively. Anchovy kilka spawn in spring and autumn but mass spawning anchovy occurred in autumn. Spawning of common kilka occurred in spring and early summer. In the age compositions of anchovy kilka, age 3 was the largest age group during 2002 and 2003 (55.3% and 52.1%, respectively). In 2004, age 4 predominated (42.5%). For common kilka, ages 3 and 4 predominated (representing 67.2, 62.0 and 69.1% of catches, respectively). According to CPUE and biological characteristics, after the appearance of ctenophore in the Caspian Sea, the abundance and biomass of bigeye and anchovy kilka collapsed.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Commercial ; Ecological ; Biological ; kilka ; Species ; Ecosystem ; Mnemiopsis leidyi ; Survey ; Length ; Age ; Sex ratios ; Weight ; Maturity ; CPUE ; Anchovy Kilka ; Spawning ; Bigeye kilka
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 49pp.
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  • 6
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    Stock assessment of the bonyfishes in Mazandaran (2003-2004) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Mullet and other bony fishes are caught by beach seine in Iranian waters in Golestan, Mazandaran and Guilan provinces. In this investigation which had conducted in commercial regions during 2003-2004, we estimated catch and CPUE, species composition, length, weight, age of two species of mullet and Salmo trutta caspius; von Bertalanffy growth parameters, mortality, biomass and MSY of Liza aurata. The total recorded catch of mullet was 3870 mt and L. auratapre dominated (98.5% of total catch of mullet). CPUE of two species of mullet; L. aurata and L. salienswere 69.6 and 1.1 mt purse seine, respectively. The catch of Salmo trutta caspius was negligible (about 3.6 mt). Biomass and MSY (maximum sustainable yield) of L. aurata were estimated to be 11019.8 and 3322.6 mt, respectively.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Commercial ; Mullet ; Bony Fish ; CPUE ; Species ; Length ; Weight ; Age ; Salmo trutta caspius ; Von Bertalanffy ; Mortality ; Biomass ; Liza aurata ; L. aurata
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 38pp.
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  • 7
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    Stock assessment of the bonyfishes in Mazandaran (2003-2004) (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25083 | 18721 | 2018-08-22 07:15:57 | 25083 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Mullet and other bony fishes are caught by beach seine in Iranian waters in Golestan, Mazandaran and Guilan provinces. In this investigation which had conducted in commercial regions during 2003-2004, we estimated catch and CPUE, species composition, length, weight, age of two species of mullet and Salmo trutta caspius; von Bertalanffy growth parameters, mortality, biomass and MSY of Liza aurata. The total recorded catch of mullet was 3870 mt and L. auratapre dominated (98.5% of total catch of mullet). CPUE of two species of mullet; L. aurata and L. salienswere 69.6 and 1.1 mt purse seine, respectively. The catch of Salmo trutta caspius was negligible (about 3.6 mt). Biomass and MSY (maximum sustainable yield) of L. aurata were estimated to be 11019.8 and 3322.6 mt, respectively.
    Keywords: Fisheries ; Iran ; Golestan Province ; Mazandaran Province ; Guilan Province ; Mullet ; Bony Fish ; CPUE ; Species ; Length ; Weight ; Age ; Salmo trutta caspius ; Von Bertalanffy ; Mortality ; Biomass ; Liza aurata ; L.aurata
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 38
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  • 8
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    Ecological study on fisheries important rivers and bays in the south part of the Caspian Sea 2nd phase: Gorgan Bay (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25385 | 18721 | 2018-09-18 05:58:09 | 25385 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: In this study ichthyoplankton, phytoplankton, zooplankton, benthic and hydrochemistry parameters were studied. 9 out of 11 sampling stations were in the Gorgan Bay area and 2 of them were in the mouth of the Bay. Ichthyoplankton survey were carried out in 6 stations and the other surveys such as phytoplankton, etc were done in 11 stations in 2009. Gorgan Bay map and position of sampling sites are given at the end of material and methods section. Biomass and frequency of phytoplankton at different stations, months and seasons were calculated that are presented in Tables 1 to 3. Hydro-chemical parameters such as water temperature, air temperature, visibility, DO, BOD5, pH, Alkalinity (bicarbonate, carbonate and total), Hardness (calcium, magnesium), CL,EC, Salinity, N (nitrate, nitrite, NH_3), Phosphate were measured and results are shown Table 11. Biomass (mgr/m^3) and numbers (ind./m^3) of 47 genus of different phylum of phytoplanktons such as Cyanophyta, Chlorophyta, Pyrophyta, Chrysophyta and Euglenaphyta as well as different phylum of zooplanktons consist of Protozoa, Arthropoda, Rotifera and Cyliophora were estimated. Frequency of phytoplanktons (ind/m^3) was 131.2, 1.6, 65.3, 18.9 and 23.8 million respectively. Furthermore, their biomass was 308.4, 1.9, 1358.9, 295.1 and 124.7 mg/m^3, respectively. The maximum and minimum numbers were observed in Leptolingbaya belonged to Cyanophyta and Diatoms of Chrysophyta 84.3 and 0.025 million (ind/ m^3) respectively. The maximum and minimum biomass was observed in Gyrosigma (Chrysophyta) and Tetradron (Chloropyta), 12317.3 and 0.014 mg/m3 respectively. The average biomass of zooplankton was measured 531.74, 30.77, 225.07, and 96.26 mg/m^3 respectively and the total was attained 883.83 mg/m3 Table 5. The maximum and minimum biomass of all zooplanktons was estimated in November and July, 3446.23 and 6 mg/m^3 respectively. Furthermore, the maximum and minimum numbers of zooplanktons were found in September and July which were 48.4 and 0.002 millions respectively and the average number was 8.4 ind/m^3 Table 4. Also numbers and biomass (gr/m^2) of 11 families of benthos which inhabit Gorgan Bay such as Annelida, Mollusca and Arthropoda were investigated in separated stations and distinctive months. The maximum and minimum biomass of benthos was observed in January (42.91 gr/m^2) and March (0.6428 gr/m^2). The biomass was considerable in April, February, August and December (Tables: 4, 5 and 6).
    Keywords: Ecology ; Iran ; Caspian Sea ; Gorgan Bay ; Ecological study ; Fisheries ; Ichthyoplanktons ; Phytoplankton ; Zooplankton ; Benthic ; Sampling ; Biomass ; Temperature ; Visibility ; pH ; Alkalinity ; Salinity ; Phosphate ; Cyanophyta ; Annelida ; Mollusca
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 97
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  • 9
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    Population dynamic of bony fishes in the southern part of the Caspian Sea (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25514 | 18721 | 2018-10-05 15:36:40 | 25514 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: This study was conducted to determine growth parameters, catch and fishing effort trends, stock assessment and Acceptable Biological Catch (ABC) of bony fishes in the Iranian coastal waters of Caspian Sea in the years 2010-2011 and 2011-2012. According to the result, the numbers of beach seines were 131 and 128 and their fishing efforts were observed 50184 and 42255 beach seining during 2010-11 and 2011-12, respectively. The catch per unit of effort CPUE) was calculated 182.9 and 205.6 kg/haul during two sampling periods, respectively. The total catches (including illegal fishing) were also obtained 16601.5 mt and 17034.1 mt during 2010-11 and 2011-12, respectively. The highest proportion of catch was belonged to kutum and golden grey mullet (86% and 88%, respectively) in two fishing seasons aforementioned above. Growth parameters of kutum were estimated as K=0.21/yr, L_∞ = 60.0 cm, t-0 = 0/yr. The Growth parameters were K=0.18/yr, L_∞ = 61.1 cm, t-0 = -0.14/yr for golden gray mullet and were K=0.12/yr, L_∞ = 73.6 cm, t-0 = 0.92/yr for common carp. Based on catch-at-age data, in the years 2010-2011 and 2011-2012, the total biomass, from the biomass-based cohort analysis were estimated 41700mt and 34400 mt for kutum and 14600 mt and 14400 mt for golden grey mullet, respectively. The reference points of F0.1 and F35% were 0.41/yr and 0.34/yr for kutum and 0.36/yr and 0.33/yr for golden grey mullet, respectively. Stock enhancement plays an important role in recovery of kutum stocks in the Iranian coastal waters of Caspian Sea. There is a significantly negative correlation between fingerlings released and condition factor (CF) and recruitment and CF. The different trends for fingerlings, recruitments and CF suggest that CF may be partly density-dependent, declining at high population sizes due to intra-specific competition. Therefore, more research should be conducted to determine the desirable level of artificial propagation. Food consumed by fish species, Rutilus frisii kutum, Rutilus rutilus caspicus, Cyprinus carpio, Liza auratus and Liza saliens were included Foraminifera, Porifera, Annelida, Mollusca, Arthropoda, filamentous algae, fish eggs and detritus.The results showed that Rutilusfrisii kutum generally feed on Balanus and Cerastorderma. The main food item for Cyprinuscarpio, Liza auratus and Liza salienswas detritus. Based on available models, the ABCs were estimated as 6600-7400 mt for kutum and 2200-2800 mt for golden grey mullet (with precautionary approach 6600 mt and 2200 mt for kutum and mullet, respectively) in 2011-12. Two species (kutum and golden grey mullet) are vulnerable to environmental factors, and these factors should be considered in the stock assessment and management of the fish. For two species, the ABC with a lower andmore accurate value based onmore information, should be selectedfor the implementation of a precautionary management approach.
    Keywords: Fisheries ; Iran ; Caspian Sea ; Bony fishes ; Growth ; Mortality ; Biomass ; Acceptable biological catch ; Population ; Stock assessment ; Fishing ; Rutilus frisii kutum ; Rutilus rutilus caspicus ; Cyprinus carpio ; Liza auratus ; Algae ; Species
    Repository Name: AquaDocs
    Type: monograph
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  • 10
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    Study of possibilities of aquaculture activities in the Gorgan Bay (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25644 | 18721 | 2018-10-08 08:25:33 | 25644 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: The Gorgan Bay has situated in the South east of the Caspian Sea and water entersthe Bay from the Sea .it covers an area about 450 squar kilometers that is connected to the sea only by the passage of Ashouradeh in the north east of the bay . The water balance is almost constant and is not tidal. In this study, a model made for the bay on the basis of its water quality and quantity. Its reactions evaluated under different qualified scenarios and its surrounding water quality survey during next 29 years. Mike 21 software was used for 2 dimensional modeling . At first hydrodynamic modeling of the bay was done .one of the important factor was water depth which calculated by hydrography method of the bay. Then, a model made for the salinity of the bay. Since, salinity is a stable parameter, a sub-program TM (Mike 21) which has the ability to make a model from the process of advection – dispersion was used. The amount of Manning (0.025) and Dispersion (50) coefficient calculated simultaneously with calibration of salinity model (D:square meter / second). Results from data verification of salinity model indicated about 3 percent mean error. The pollution dispersion type in the bay evaluated at six points of the bay using the method of dot constant source of pollution. Results showed that around 99.9 percent of pollution decreases under the effect of dilution process till the 100 m distance. Then modeling of dissolved oxygen, Ammonia, nitrite and nitrate was done by using of subprogram ECOLAB at the Mike software To make these models, first the sensitivity analysis of these parameters was done. Important parameters chose for model calibration and then data verified and also the model calibrated. The result of data verification test showed the mean error of oxygen, ammonia, nitrite and nitrate were respectively about 3, 4, 6.3 and 37 percent. Then modeling made according to four different scenarios which defined on the basis of pollutions originated from aquaculture in the bay (scenario 1: aquaculture at the first half year. Scenario 2: aquaculture at the 2nd half year. Scenario 3: aquaculture at the whole of year. Scenario 4: cultivation of bluga for 3 years). Water quality of the bay and also different amount of aquaculture production surveyed during next 29 years under different scenarios of aquacultures. The places under pollution were included the appropriate places for aquacultures in each scenario that was already determined at the bay .Then the reaction of the Gorgan bay was determined under each scenario. The curves of pollution fluctuations were drawn along with amount of cultivation at the each scenario. At last, appropriate amount of cultivation was calculated at each scenario with considering of self-purification of the bay that does not tend to pollution of the bay. On the other hand, the farms arrange, distances between farms and the number of cultivation ponds at the each farm was calculated. Finally, results showed that the aquaculture capacity of the bay is less than 300 tons per year.
    Keywords: Aquaculture ; Ecology ; Iran ; Caspian Sea ; Gorgan Bay ; Aquaculture ; Salinity ; Pollution ; Dissolved oxygen ; Ammonia ; Nitrite ; Cultivation ; Beluga ; Self purification
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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