Abstract
Trawl surveys made in the Lower Volga and the Caspian Sea revealed that the full life cycle of the Lower Volga sterlet is confined to fresh water and only single specimens living in the Volga-Caspian canal can live in the canal and swim to weakly saline and stagnant waters. Therefore, the sterlet living in the Volga-Caspian canal with its expressed current should be attributed to potamodromous forms. In consideration of the data on distribution, the variation of the complex of plastic characteristics, growth rate, and infestation with the parasite Amphilina foliacea it is concluded that within the Lower Volga population of sterlet three populations of the lower rank may be discerned: the Volgograd population living from the Volgograd Hydroelectric Complex dam to the Kamennyi Yar settlement; the eastern population living in the top of the Volga Delta and Buzan channel; and the western population in the Volga-Caspian canal. These populations differ in some plastic characteristics, linear growth rate, the part of fish infested with the parasite A. foliacea, and in the occurrence of anomalies in the structure of mature ovicells.
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Original Russian Text © V.A. Kalmykov, G.I. Ruban, D.S. Pavlov, 2009, published in Voprosy Ikhtiologii, 2009, Vol. 49, No. 3, pp. 380–388.
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Kalmykov, V.A., Ruban, G.I. & Pavlov, D.S. On the populational structure of sterlet Acipenser ruthenus (Acipenseridae) from the Volga Lower reaches. J. Ichthyol. 49, 339–347 (2009). https://doi.org/10.1134/S0032945209040067
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DOI: https://doi.org/10.1134/S0032945209040067