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A total of 21 invasive species are recorded in ichthyofauna of the Cheboksary reservoir and water bodies of its basin. Nine-spined stickleback Pungitius pungitius (L., 1758) is one of naturalized species which is spreading in the territory of the Middle and Upper Volga. In our opinion, nine-spined stickleback is an undesirable invader. That is why the morphological characteristics and intraspecific...
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