Crayfish in the reservoirs of the Republic of Tatarstan

International Scientific and Practical Conference: Water Power Energy Forum 2018

Kalayda, M.L.^1 ; Bogatyrev, I.A.^1

Water Bioresources and Aquaculture Department, Kazan State Power Engineering University, Krasnoselskaya, 51, Kazan

420066, Russia^1

关键词: 20th century;    Body weight;    Freshwater ecosystem;    Hydrochemicals;    Inland waters;    Integral part;    Natural population;    Trophic chains;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/288/1/012045/pdf
DOI  :  10.1088/1755-1315/288/1/012045

来源: IOP

【 摘 要 】

Among the few commercial invertebrates in Europe, the most valuable resource species of crustaceans are representatives of the genus Astacus, primarily broad-fingered crayfish (Astacus astacus L.), which lives in inland waters - lakes, rivers, reservoirs. Crayfish are an integral part of the trophic chain of freshwater ecosystems, performing sanitary functions, utilizing animal and plant remains, thereby improving the epizootic situation and hydrochemical regime of water bodies. In the Republic of Tatarstan, before the regulation of the Volga River, there were 2 species of the genus Astacus - narrow-fingered crayfish (A. leptodactylus Esch.) and broad-fingered crayfish (A. astacus L.), and in the 30s of the 20th century, only the narrow-fingered crayfish in consequence of epizootics plague of crayfish. Presently, both species of crayfish are represented in crayfish populations, and in the Kuibyshev reservoir zone the ratio of narrow-fingered to broad-fingered crayfish is 3: 2, in the zone of the Nizhnekamsk reservoir - 1: 1. In the catches there are individuals from 8 cm to 17 cm with a body weight of 20 to 100 g. The females of narrow-fingered crayfish were 27.8%, and females of broad-fingered crayfish - 20% of the total number. In connection with the worldwide trend in the growth of the popularity of crayfish in food use, the importance of research of natural populations as a potential breeding stock for the tasks of industrial crayfish farming grows.