Abstract—
The study presents data on the biology of the marginal population of burbot Lota lota from the lower reaches of the Volga. Individuals aged from 3 to 7 years were recorded in the catches; a relatively short age range is due to mass die-offs of burbot in hot years. Spawning continues from mid-January to mid-February; the migration of larvae takes place until April–early May. The diet is dominated by the Ponto-Caspian kilka Clupeonella cultriventris and gobies (Gobiidae); among the latter, the most important are the round goby Neogobius melanostomus, the Caspian bighead Ponticola gorlap, and the monkey goby N. fluviatilis. At present, the southern populations of burbot of the Saratov reservoir and the lower reaches of the Volga are characterized by the highest growth rates in water bodies of Northern and Eastern Europe. This is primarily due to the high abundance and availability of prey that mostly represent fish species, which have expanded their presence in the Volga basin under conditions of regulated runoff.
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Notes
Two more species of gobies—the racer and the tadpole goby, noted in the diet of burbot, were not found in the catches of the seine as their preferred biotopes are situated at greater depths.
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Boldyrev, V.S. Features of Burbor Lota lota (Gadidae) Biology in the Lower Volga. J. Ichthyol. 61, 576–584 (2021). https://doi.org/10.1134/S0032945221040019
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DOI: https://doi.org/10.1134/S0032945221040019