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1 | The article addresses changes in the fauna of the river Tom basin in the last 90 years, starting from the last century’s second decade in this work data on areas of distribution, certain size, weight and reproductive characteristics are shown. The authors discuss disappearance of pydschjan and tugun from the area. As a result of planned acclimatization efforts in the river Ob, at least 5 species were introduced to river Tom’s ichthyofauna. While in the dawn of research, salmonidae fishes were dominant species, in the present time, the basin is heavily populated by cyprinidae and percidae. Keywords: river Tom, ichthyofauna, introduced species, changes in fish population, distribution of species | 1201 | ||||
2 | The article provides data on distribution of the bleak in the lower Tom, its portion on number in catches on various sites of this ecosystem. Morphological features of this species (the sizes and structure of scales, meristic and morphometric signs), spawning terms, indicators of reproductive ability, structure of population of the bleak for a row of years (2003–2013) are considered. Keywords: structure, population, morphology, bleak | 965 |