FISH POPULATION SPREADING IN THE ATTSA RIVER
2013
The Attsa River is a valuable fi sh reserve of rheophilic complex and serves a major spawning place for marketable fi sh species. River ichthyofauna includes 28 species, the most numerous and relatively evenly distributed throughout the river are perch, gudgeon, bleak, mustachioed trout, chub and golden carp. Fish diversity is increased consistently from the source to the mouth, in hauls, percentage of fi sh rheophils is diminished but increased for the fi sh entering from the Kuibyshev reservoir. In the lower stream of the river many fi sh species typical of the reservoir but not found above on the stream are noted, such as bream, carp, blue bream, sabrefi sh, bersh, gobies and others. 4 fi sh species included in the Red Book of Ulyanovsk area are found in the Attsa River: brook trout, chub, common minnow and Volga undermouth. It is interesting that rainbow trout was repeatedly catch here; the species is seemingly enters periodically the river from the pond farms situated upstream.
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