Abstract
Based on the size composition of freshwater bream Abramis brama in commercial catches from the Ural River, we have assessed the stock status of the Ural stock of the North Caspian population using the LB-SPR method. Values of the parameters of the Bertalanffy equation have been calculated for the bream from the Ural stock for the first time: the asymptotic length of an individual is 47.0 cm, the growth constant is 0.13, the hypothetical age at which the fish length would be 0 is 2.17; 50% of individuals mature at a length of 23.2 cm and 95% at a length of 28.7 cm. The estimated spawning potential ratio (0.26) is lower than the biological target (0.40) and formally indicates the state of stock overfishing.
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ACKNOWLEDGMENTS
The authors are grateful to the developer of the LB-SPR method and LB-SPR software package A. Hordyk (Centre for Fish, Fisheries and Aquatic Ecosystems Research), as well as to N.G. Petukhova (Russian Federal Research Institute of Fishery and Oceanography) for advice on the application of the method and interpretation of the results.
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Safaraliev, I.A., Popov, N.N. Qualitative Assessment of the Stock Status of Freshwater Bream Abramis brama (Cyprinidae) from the Ural Stock Based on the LB-SPR Method. J. Ichthyol. 62, 476–486 (2022). https://doi.org/10.1134/S0032945222030134
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DOI: https://doi.org/10.1134/S0032945222030134