Biology of North Caspian Roach Rutilus Rutilus Caspicus (Jakowlew, 1870) of the Northern Daghestan Caspian Coast

Abstract

The article is devoted to the study of biological characteristics of the north Caspian roach of the Daghestan coast of the Caspian Sea. Discussed are size and weight, fatness, passing the stage of gonad maturity, the absolute individual fecundity and feeding habits. The degree of occurrence of organisms in the food lumps with identification of dominant groups is determined.

Current state of juvenile roach (Rutilus rutilus caspicus)

“…Changes in environmental conditions and human economic activity cause fluctuations in the reserves of Caspian hydrobionts; the species composition of the commercial ichthyofauna of the sea is represented by both commercial and low-value ichthyofauna. According to ichthyological studies, the dominant species among commercial fish is the roach, which is very widespread, forming several subspecies [1]. In the waters Caspian Sea, adult roach and its juveniles are found almost everywhere with the highest density in the zone influenced by the flow of the Kigach and Ural rivers [2].…”