Fish in the reservoirs of northern Transbaikalia

Although the northern part of the Transbaikal Territory is situated in the taiga zone, a combination of the taiga with the landscapes of the subarctic zone is a characteristic of the region. This fact had a substantial effect on the formation of ichtyofauna in water reservoirs of the northern regions of the taiga in Transbaikalia, where Kodar national park was established in 2018. A description of the structure of ichtyocenoses of various aquatic ecosystems is presented in the work. A unique combination of fish of the Arctic, boreal-foothill, boreal-plain complexes is shown. Characterization of fish from the Chara river is presented. The representatives of the Boreal-foothill complex and the arctic complex were dominating in the ichtyofauna of the river. Grayling occurred most frequently. Round whitefish and tugun were rare. The data on the growth and nutrition of grayling, round whitefish, tugun in the Chara are reported. A description of fish in deep lakes is presented. The lakes relate to Salvelinus (Charr) and whitefish types according to the composition of the ichtyofauna. Representatives of the boreal foothill complex dominate in deep-water lakes. Species domination is lakes varies noticeably in spite of the close location of these lakes. The growth and nutrition of Brachymystax lenok, Salvelinus (Charr), humpback whitefish are characterized. The data on the species diversity for the Chkalovo group of lakes are presented. Reasons affecting the changes in the species diversity of fish at the territory under study are analyzed, first of all those connected with the construction of the BAM, pollution of water ecosystems, increased fish poaching.

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