THE ANALYSIS OF EFFICIENCY OF REPRODUCTION OF FISHES IN THE MESHINSKY GULF OF THE KUIBYSHEV RESERVOIR

Abstract

Fluctuation of number of larvae of fishes in coastal zone is considered and pelagial the Meshinsky gulf of the Kuibyshev reservoir in 2012-2017 with different hydrological conditions, and also change of indicators of their specific variety in both biotopes. It is established that average sizes of total number of larvae of fishes fluctuated these years in a in coastal zone in terms of one effort from 53,7 to 401,8 copies (respectively on m³ water 1 volume from 812,7 to 5659,0 copies) and in pelagial - on 1 m³ from 0,36 do 2,21 piece. Fluctuation of level and water temperature in the spring these years significantly did not influence efficiency of reproduction of fishes. The number of species of larvae of fishes to littorals and pelagial in 2012-2017 equaled 13-17. In coastal zone only small fry larvae, and in pelagial of a larva the perches of fishes dominated (Volga zander and a perch). The index of a specific variety of Shannon at larvae of fishes in pelagial was higher, than in coastal zone. It is connected with that in pelagial value of an indicator of abundant is lower and smaller distinctions in the number of separate types were observed.