Fish fauna of the Biyuk-Karasu River (Central Crimea)
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Abstract
The Biyuk-Karasu River is the most full-flowing watercourse among all the rivers of the north-eastern macroslope of the Crimean Mountains. It differs from other rivers of this hydrological region in its characteristics and has a rich native fish fauna. The modern composition of the river ichthyofauna is analyzed: in the upper reaches, the native fish community is almost completely displaced by the limnophilic complex of fish acclimatized in the reservoirs located there. We registered 13 species: bream, grass carp, silver carp — white and motley, roach, silver carp, carp, pike, common perch, pike-perch and gobies — sandpiper and bighead. In the watercourses above the Belogorsk reservoir, brook trout was noted, including one similar in color to the Adler amber breed. This may indicate the penetration of individuals from the trout farm located on the river. In the middle reaches of the Biyuk-Karasu, the complex of native species has been preserved almost completely, with the exception of the small vimba that has disappeared. The main species in this area in the last decade are: chub, as well as gudgeon, barbel and shemaya. In the lower reaches, there is currently a large complex of alien Dnieper species: inhabitants of lentic reservoirs — bitterling, roach, bleak, rudd, as well as gobies — sandpiper, messenger, golovach. The abundance of such species as Amur chebachok, silver crucian carp, bream, pike and common perch was somewhat lower. The changes associated with the problems of supplying Dnieper river water to Crimea did not have a significant impact on the species composition of the ichthyofauna of this area. In general, in the direction from the upper reaches of the river to the lower reaches, the indicators of species richness and diversity increase in ichthyocenes with an almost unchanged alignment of communities and the level of dominance.
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References
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