Abstract
The data on age, size, and sex structure of the population, on the linear and weight growth of bream Abramis brama are generalized for the period of 1954–2007 in Rybinsk Reservoir. Analysis of dynamics of these parameters demonstrated that recently a high fishing intensity is both reflected on the size of the stock but also determines the changes in structural parameters of the bream population. At present, in the exploited stock of bream, the specimens of junior ages dominate. The part of specimens older than ten years, which previously made the bulk of catches, now compose not more than 10–15%. This resulted in a rather noticeable decrease of mean age and size in catches. The previously observed sex ratio, near 1: 1, shifted towards a significant prevalence of males. The age of the first spawning and of the fish spawning for the first time decreased. These changes indicate that the fishing load surpasses adaptational potential of bream.
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Original Russian Text © Yu.V. Gerasimov, S.Yu. Brazhnik, A.S. Strelnikov, 2010, published in Voprosy Ikhtiologii, 2010, Vol. 50, No. 4, pp. 515–525.
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Gerasimov, Y.V., Brazhnik, S.Y. & Strelnikov, A.S. Dynamics of structural parameters of populations of the bream Abramis brama (Cyprinidae) in Rybinsk Reservoir in 1954–2007. J. Ichthyol. 50, 465–474 (2010). https://doi.org/10.1134/S0032945210060056
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DOI: https://doi.org/10.1134/S0032945210060056