Abstract
Data on the age and size dynamics, linear and weight growth, and feeding of zander Stizostedion lucioperca collected in the Rybinsk Reservoir in 1954–2010 were generalized. The main factors determining the numbers of zander population and causing changes in its structural indices are the intensity of fishery and feeding conditions. Beginning from the mid-1990s, commercial load considerably exceeds the adaptation possibilities of the zander population; under the impact of this factor, its numbers declined, and the age structure changed towards the domination of individuals of junior ages. Introduction of the Black-Sea sprat Clupeonella cultriventris along with of climate warming led to negative changes in the populations of prey fish, as a result of which the proportion of their own juveniles increased in the feeding of adult zander. During recent years, zander fingerlings throughout summer cannot pass to predatory feeding, which leads to a decrease in the rate of linear and weight growth of mature individuals.
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Original Russian Text © Yu.V. Gerasimov, A S. Strel’nikov, M.N. Ivanova, 2013, published in Voprosy Ikhtiologii, 2013, Vol. 53, No. 1, pp. 57–68.
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Gerasimov, Y.V., Strel’nikov, A.S. & Ivanova, M.N. Dynamics of structural indices of populations of zander Stizostedion lucioperca (Percidae) of the Rybinsk Reservoir for 1954–2010. J. Ichthyol. 53, 41–51 (2013). https://doi.org/10.1134/S0032945213010050
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DOI: https://doi.org/10.1134/S0032945213010050