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Habitat suitability of Tajan river estuary for the released fingerling common carp (Cyprinus carpio) in order to restore stocks
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Nima Pourang *   , Mohammad Ali Afraei Bandpei , Hassan Nasrollahzadeh Saravi , Fatemeh Sadat Tahami , Mehdi Naderi Jolodar , Tahere Bagheri |
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Abstract: (732 Views) |
Introduction: Considering the unsuitability of natural reproduction and restoration conditions of fish in the important rivers of the southern Caspian Sea (including Tajan River) and the importance of investigating the habitat suitability of these rivers in terms of releasing juvenile fish with economic value, in this research, for the first time in the country, in order to investigate the suitability of Tajan River from the point of view of releasing common carp fingerlings, habitat suitability index (HSI) was used.
Materials & Methods: Since currently, due to the unsuitable habitat conditions of the Tajan River, the only available option of the Iran Fisheries Organization to release juvenile fishes in the Tajan River is in the estuary of this river, therefore, in the current research, this area was selected to sample the fingerlings and investigate various biotic parameters (phytoplankton and zooplankton) and abiotic (water temperature, pH, salinity, dissolved oxygen, turbidity, total suspended solids, total dissolved solids, electrical conductivity, total hardness, ammonium nitrogen, NH3, biochemical oxygen demand, chemical oxygen demand, nitrite nitrogen, nitrate nitrogen, total nitrogen and total phosphorus). The above-mentioned biotic and abiotic parameters were determined during the months of July, August and September 2022 and August and September 2023.
Result: There was a strong relationship between the abundance of pyrrophyta, Chironomidae and Cyanobacteria with the abundance of the common carp fingerlings, which was positive in all cases. The highest selectivity index values for the common carp fingerlings were related to EC, BOD5, pH, NO2-/N, NH3, and TN⁄N, which indicates the greatest impact of these parameters on the survival and distribution of juvenile fish in the Tajan River estuary during the time period of this research. HSI values of Tajan River estuary for the fingerlings in the studied time period was calculated as 0.927.
Conclusion: Despite the fact that the conditions of the release site of the fingerlings (the estuary) were inappropriate from the point of view of the range of changes of some parameters (including total suspended matter, total nitrogen, total phosphorus, ammonium nitrogen, electrical conductivity and turbidity), but in general, according to the calculated HSI, the study area can be classified as "highly suitable habitat" for the fingerlings, in the studied time period. The implementation method and results of this research can be used as a model for similar studies in other important rivers with fishery value. |
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| Keywords: Stock enhancement, Habitat suitability, Release of fingerlings, Tajan River, Cyprinus carpio |
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Full-Text [PDF 1072 kb]
(323 Downloads)
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Type of Study: Review |
Subject:
Special
Received: 2025/10/13 | Accepted: 2025/10/2 | Published: 2025/10/2
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Pourang N, Afraei Bandpei M A, Nasrollahzadeh Saravi H, Tahami F S, Naderi Jolodar M, Bagheri T. Habitat suitability of Tajan river estuary for the released fingerling common carp (Cyprinus carpio) in order to restore stocks. Journalaer 2025; 1 (4) :75-86 URL: http://journalaer.com/article-1-53-en.html
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