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  • 1
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    Determination of heavy metal (Cr, Zn, Cd and Pb) concentrations in water, sediment and benthos of the Gorgan Bay (Golestan province, Iran) (2018)
    Details
    Publication Date: 2021-05-19
    Description: The coastal area of the Caspian Sea and Gorgan Bay are important ecosystems receiving discharge from their tributaries. In this study, concentration of lead (Pb), cadmium (Cd), zinc (Zn) and chromium (Cr) was seasonally determined at 8 sampling points during 2009-2010. Water samples were collected from the sampling stations and transferred to laboratory in polyethylene containers, whereas, sediment and benthic fauna samples were collected using a Van Veen grab. The levels of heavy metals were determined by atomic absorption spectroscopy method. Results showed that range of Pb, Cd, Cr and Zn in the water samples were 80-123, 61-97, 63-87 and 82-120 ppb, respectively and their ranges in the sediment samples were 479-1072, 98-293, 102-622 and 937-1577 ppb, respectively. The range of Pb, Cd, Cr and Zn in the benthos samples were 95-132, 59-110, 26-58 and 103-155 ppb, respectively. Zn and Pb were the most concentrate metals in all samples. Likewise, sediment had the highest heavy metal content amongst the samples. This study demonstrated that the level of metals in the environment is increasing, bringing a serious warning to industries and threat of man-made contamination, which can be restricted and a necessity to control ecosystem and food-chain pollution
    Description: Published
    Keywords: Ecology ; Water ; Heavy metals ; Sediment ; Benthos
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.449-455
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  • 2
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    Some biological parameters of Silver Crucian carp, Carassius auratus, in the international wetlands of Alma-Gol and Ala-Gol (Golestan Province, Iran) (2018)
    Details
    Publication Date: 2021-05-19
    Description: In the present study, age, growth and reproduction of Carassius auratus were investigated in the Alma-Gol and Ala-Gol (northern Iran) from September 2000 to August 2002. Among the total of 1450 specimens, the estimated ages ranged from 0+ to 8+ years. C. auratus showed an allometric growth, negatively in Alma-Gol and positively in Ala-Gol. The von Bertalanffy growth curves were fitted to mean total lengths at age, resulted as Ltmales=183.33(1-e-0.31(t+1.05)) and Ltfemale=245.66(1-e-0.19(t+1.21)) for Alma-Gol population and Ltmale=224.79(1-e-0.24(t+0.83)) and Ltfemale=242.80(1-e-0.23(t+0.80)) for Ala-Gol population. The value of f’ index varied from 9.25 to 9.51. The unbalanced sex ratio of males to females was 1:10 and 1:12.7 in Alma-Gol and Ala-Gol, respectively. The reproductive period for this species in these particular areas was February, March and April and the maximum recorded GSI was 2.19 and 2.17 for males and 10.37 and 10.49 for females in Alma-Gol and Ala-Gol, respectively. The linear relationship between absolute fecundity and total weight was more suitable for expressing the fecundity-weight relationship for both populations as estimated: Fec.Alma-Gol= 4120.56+ 62.62W and Fec.Ala-Gol= 3832.83+ 68.67W.
    Description: Published
    Keywords: Silver carp ; Carassius auratus ; Biology ; Wetland ; Growth ; Sex
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.163-174
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  • 3
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    Study on ecological capacity of the release sites of the fingerlings of sturgeon and bony fishes in order to regulate the restocking program at the Gorganrud River (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This review is started from April 2002 in Gorgan River and continued for one year. Three sampling stations along the river to the mouth of the estuary were 4000 meters away from the bridge to the village Charqly all samples were collected in this area. Four million sturgeon larvae with average weight of 3/2 grams were obtained from martyr Marjani and Vushmgir Dam farms. Over 40 days released at release stations, and 316 million bony fish fingerlings are being release that 282 million were whitefish, 25 million carp and 9 million bream from Vushmgir Dam and Syjval Bream Center within two months at the release stations in Gorgan River. At sampling stations, especially estuaries to determine the shelf life of fry in the river and to determining migration into the river as well as physical - chemical and assess the frequency and biomass of feeding materials (phytoplankton, zooplankton, and benthos) at the sampling stations in Gorgan River were studied. The entire estuary to the sea makes itself. Maximum migration happened at sunset. Average Debbi for 20-year was at the rate of 14.95 cubic meters per second. In 2002, the annual average was 20.8 cubic meters per second, respectively. Evaluation of abundance and biomass of feeding materials (phytoplankton, zooplankton, and benthos) indicates the status of the average biomass of phytoplankton in the river at the release station was 23/75 mg per liter that was highest in September and was lowest in December. Mean primary production based on a 145 mg chlorophyll cubic meters. 6 orders of benthic invertebrates were observed. Benthic including 9 families and 11 genera have been identified including groups of insects, worms, low-tar and Polychaetes, crustaceans, bivalve and gastropod. But at the release station (S2) the highest levels of benthic biomass (18/18 grams per square meter) degree of diversity of benthic organisms (12) species have largely been seen as a maximum in April and minimum in December. Also zooplankton condition, zooplankton total of 27 genera belonging to five categories, Rotatoria, Kladvsra, Coupe Pvda, Balanvs, and protozoa were identified. In general, in September zooplankton has the greatest diversity and abundance and in September and March, the lowest number is observed.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Ecological ; Capacity ; Fingerlings ; Sturgeon ; Bony fish
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 110pp.
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  • 4
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    Investigating the density and frequency of zooplankton in the Southeastern Basin of the Caspian Sea (Gorgan Bay) (2020)
    Details
    Publication Date: 2021-05-19
    Description: Zooplanktons have an important role in food chain of the aquatic ecosystems, which acts as a food chain link between producers (phytoplankton) and higher nutritional levels. The purpose of this research was to identify and study the zooplankton density in the southeastern basin of the Caspian Sea (Gorgan Bay). Sampling was performed seasonally and samples were collected by zooplankton net (36 cm and mesh size of 100µm) with three replications from three areas including: pan-cultures, Ashooradeh pier and entrance of sea water to the Bay. In this study, zooplankton groups belong to 16 species of 6 phylum were identified containing: Copepoda, Rotatoria, Protozoa, intermediate zooplankton (zoobenthose) and a group including other zooplankton groups. The mean Shannon diversity index during sampling time was 1.57±0.26, Margalef species richness index was 1.83±0.43, and for the uniformity index was 0.69±0.12. The lowest Shannon Diversity Index was 1.12 in the autumn station 6 was considered due to human activity, commuting boats (tourists and fish hunting), and the oil pollutants in this region, and the highest Margalef index was 2.76 in the spring station 2 and the Pielou's evenness index was highest for the winter at station 5 (0.92). Cluster analysis and non-metric multidimensional scaling showed the similarity of stations with each other based on abundance distribution of species in two distinct groups. Finding of research could play an important role in environmental protection in the Gorgan Bay.
    Description: Published
    Keywords: Zooplanktons ; Ecosystem ; Protozoa ; Food chain ; Phytoplankton
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.59-70
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  • 5
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    Age structure and growth rate of (Squalius cephalus Linnaeus, 1758) in Tuji tributary from Talar River, Mazandaran Province (2017)
    Details
    Publication Date: 2021-05-19
    Description: A structure and growth pattern of Squalius cephalus (Linnaeus, 1758) in Tuji tributary of Talar River, Mazandaran Province, was studied during the period from August 2008 till August 2009. In total, 298 fish were caught by electrofishing and fixed in 10% formalin. The weight and length of fish were measured and the age was determinated by scallometric method. The age data showed that fishes were between 0+ to 4+ age groups. Pauli`s applied growth pattern showed a positive alometric for male and female and total fish and a negative isometric for unmature fishes. The average instantaneous growth rate of European Chub showed that the age groups 2+ and 3+ with 1.1 had the fastest growth compare to 3+ and 4+ age groups with 0.89. Condition factor of specimens showed that the highest one with 1.58 (r2 = 0.983) belong to females and the lowest with 1.17 (r2 = 0.901) belong to unmature fishes. The total sex ratio (123 males to 115 females) showed no significant differences between them.
    Description: Published
    Keywords: Squalius cephalus Linnaeus ; Tuji tributary ; Age ; Structure ; Growth ; Biology ; Fish ; Freshwater
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.107-118
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  • 6
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    Age structure and growth rate of (Squalius cephalus Linnaeus, 1758) in Tuji tributary from Talar River, Mazandaran Province (2021)
    In:  http://aquaticcommons.org/id/eprint/21914 | 18721 | 2018-01-16 10:59:26 | 21914 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-04
    Description: A structure and growth pattern of Squalius cephalus (Linnaeus, 1758) in Tuji tributary of Talar River, Mazandaran Province, was studied during the period from August 2008 till August 2009. In total, 298 fish were caught by electrofishing and fixed in 10% formalin. The weight and length of fish were measured and the age was determinated by scallometric method. The age data showed that fishes were between 0+ to 4+ age groups. Pauli`s applied growth pattern showed a positive alometric for male and female and total fish and a negative isometric for unmature fishes. The average instantaneous growth rate of European Chub showed that the age groups 2+ and 3+ with 1.1 had the fastest growth compare to 3+ and 4+ age groups with 0.89. Condition factor of specimens showed that the highest one with 1.58 (r2 = 0.983) belong to females and the lowest with 1.17 (r2 = 0.901) belong to unmature fishes. The total sex ratio (123 males to 115 females) showed no significant differences between them.
    Keywords: Biology ; Fisheries ; Fish biology ; Freshwater fish ; Tuji tributary ; Talar River ; Squalius cephalus ; Mazandaran Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 107-118
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  • 7
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    Study on some biological parameters of the Bitterling (Rhodeus amarus) in Sefidrood River (Guilan Province) and Siyahrood River (Mazandaran Province) (2021)
    In:  http://aquaticcommons.org/id/eprint/22135 | 18721 | 2018-02-12 11:36:54 | 22135 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-27
    Description: This study aimed to determine and comparison of age composition, sex ratio, growth model, and fecundity of the populations of Rhodeus amarus in Sefidrood River and Siyahrood River. In total 423 fish were caught monthly from February to June 2013. In Sefidrood River, were abundant males (58.2%) than females (41.8%) and in Siyahrood River, females (59.4%) than males (40.6%) and it was different from standard ratio (1male:1female). The fishes in Siyahrood River have had 1+ till 8+ years old and in Sefidrood River 1+ till 9. The average of total length and body weight was 47.9±10.4 mm and 1.98±1.4g in Siyahrood River and 56.3±7.3 mm and 2.88±1.0 g in Sefidrood River, respectively and there were significant statistical differences between these parameters in both rivers(p〈0.001). Growth model in two rivers was positive allometric. The condition coefficient of males was higher than of females in both rivers(p〈0.05). The absolute fecundity was evaluated 67.9±35.2 in Siyahrood River females and 78.8±33.1 in Sefidrood River females and significant statistical difference was observed in studied rivers. Absolute fecundity had significant correlation with fish total length and body weight. The results of this study will help to increase the information available about this species.
    Keywords: Biology ; Fisheries ; Bitterling ; Rhodeus amarus ; Age ; Growth ; Fecundity ; Sefidrood River ; Siyahrood River ; biological ; parameters ; Mazandaran Province ; Guilan Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 81-90
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  • 8
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    Determination of heavy metal (Cr, Zn, Cd and Pb) concentrations in water, sediment and benthos of the Gorgan Bay (Golestan province, Iran) (2021)
    In:  http://aquaticcommons.org/id/eprint/22699 | 18721 | 2018-05-16 20:30:38 | 22699 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-09
    Description: The coastal area of the Caspian Sea and Gorgan Bay are important ecosystems receiving discharge from their tributaries. In this study, concentration of lead (Pb), cadmium (Cd), zinc (Zn) and chromium (Cr) was seasonally determined at 8 sampling points during 2009-2010. Water samples were collected from the sampling stations and transferred to laboratory in polyethylene containers, whereas, sediment and benthic fauna samples were collected using a Van Veen grab. The levels of heavy metals were determined by atomic absorption spectroscopy method. Results showed that range of Pb, Cd, Cr and Zn in the water samples were 80-123, 61-97, 63-87 and 82-120 ppb, respectively and their ranges in the sediment samples were 479-1072, 98-293, 102-622 and 937-1577 ppb, respectively. The range of Pb, Cd, Cr and Zn in the benthos samples were 95-132, 59-110, 26-58 and 103-155 ppb, respectively. Zn and Pb were the most concentrate metals in all samples. Likewise, sediment had the highest heavy metal content amongst the samples. This study demonstrated that the level of metals in the environment is increasing, bringing a serious warning to industries and threat of man-made contamination, which can be restricted and a necessity to control ecosystem and food-chain pollution.
    Keywords: Biology ; Fisheries ; Water ; Heavy metals ; Sediment ; Benthos ; Gorgan Bay ; Golestan province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 449-455
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  • 9
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    Some biological parameters of Silver Crucian carp, Carassius auratus, in the international wetlands of Alma-Gol and Ala-Gol (Golestan Province, Iran) (2021)
    In:  http://aquaticcommons.org/id/eprint/22344 | 18721 | 2018-03-26 16:52:00 | 22344 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-03
    Description: In the present study, age, growth and reproduction of Carassius auratus were investigated in the Alma-Gol and Ala-Gol (northern Iran) from September 2000 to August 2002. Among the total of 1450 specimens, the estimated ages ranged from 0+ to 8+ years. C. auratus showed an allometric growth, negatively in Alma-Gol and positively in Ala-Gol. The von Bertalanffy growth curves were fitted to mean total lengths at age, resulted as Ltmales=183.33(1-e^-0.31(t+1.05)) and Ltfemale=245.66(1-e^-0.19(t+1.21)) for Alma-Gol population and Ltmale=224.79(1-e^-0.24(t+0.83)) and Ltfemale=242.80(1-e^-0.23(t+0.80)) for Ala-Gol population. The value of φ' index varied from 9.25 to 9.51. The unbalanced sex ratio of males to females was 1:10 and 1:12.7 in Alma-Gol and Ala-Gol, respectively. The reproductive period for this species in these particular areas was February, March and April and the maximum recorded GSI was 2.19 and 2.17 for males and 10.37 and 10.49 for females in Alma-Gol and Ala-Gol, respectively. The linear relationship between absolute fecundity and total weight was more suitable for expressing the fecundity-weight relationship for both populations as estimated: Fec.Alma-Gol= 4120.56+ 62.62W and Fec.Ala-Gol= 3832.83+ 68.67W.
    Keywords: Biology ; Fisheries ; Carassius auratus ; Biology ; Wetland ; Golestan Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 163-174
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  • 10
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    Study on ecological capacity of the release sites of the fingerlings of sturgeon and bony fishes in order to regulate the restocking program at the Gorganrud River (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25677 | 18721 | 2018-10-12 17:45:07 | 25677 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: This review is started from April 2002 in Gorgan River and continued for one year. Three sampling stations along the river to the mouth of the estuary were 4000 meters away from the bridge to the village Charqly all samples were collected in this area. Four million sturgeon larvae with average weight of 3/2 grams were obtained from martyr Marjani and Vushmgir Dam farms. Over 40 days released at release stations, and 316 million bony fish fingerlings are being release that 282 million were whitefish, 25 million carp and 9 million bream from Vushmgir Dam and Syjval Bream Center within two months at the release stations in Gorgan River. At sampling stations, especially estuaries to determine the shelf life of fry in the river and to determining migration into the river as well as physical - chemical and assess the frequency and biomass of feeding materials (phytoplankton, zooplankton, and benthos) at the sampling stations in Gorgan River were studied. The entire estuary to the sea makes itself. Maximum migration happened at sunset. Average Debbi for 20-year was at the rate of 14.95 cubic meters per second. In 2002, the annual average was 20.8 cubic meters per second, respectively. Evaluation of abundance and biomass of feeding materials (phytoplankton, zooplankton, and benthos) indicates the status of the average biomass of phytoplankton in the river at the release station was 23/75 mg per liter that was highest in September and was lowest in December. Mean primary production based on a 145 mg chlorophyll cubic meters. 6 orders of benthic invertebrates were observed. Benthic including 9 families and 11 genera have been identified including groups of insects, worms, low-tar and Polychaetes, crustaceans, bivalve and gastropod. But at the release station (S2) the highest levels of benthic biomass (18/18 grams per square meter) degree of diversity of benthic organisms (12) species have largely been seen as a maximum in April and minimum in December. Also zooplankton condition, zooplankton total of 27 genera belonging to five categories, Rotatoria, Kladvsra, Coupe Pvda, Balanvs, and protozoa were identified. In general, in September zooplankton has the greatest diversity and abundance and in September and March, the lowest number is observed.
    Keywords: Aquaculture ; Ecology ; Iran ; Gorganrud River ; Capacity ; Fingerlings ; Sturgeon ; Bony fish
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 110
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