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BIOLOGICAL CHARACTERISTICS AND COMMERCIAL STOCKS OF HUMPBACK WHITEFISH IN YAKUTIA WATERS

By Tyaptirgyanov M. M.

Abstract

Humpback whitefish - Coregonus lavaretus pidschian (Gmelin, 1788), is spread in Siberia, in the Kara, Laptev and East Siberian seas and in the lakes of the Arctic and Subarctic. Objective: To assess the status of fish in the waters of Yakutia, to make ecological forecasts and determine the possibility and prospect of economic use of whitefish, as a fish-breeding material in the present conditions. Methods: The analysis was carried out on the fresh material as described I.Pravdina (1966), taking into account the recommendations of Y. Reshetnikov (1980). Collection and processing of materials were carried out in 1969-2015 by standard methods. Results. Reaching sexual maturity at the sixth (in weight - the eighth and ninth) year of life, whitefish begin to move to the main breeding groundsin the early fall. Absolute fecundity of eggs 2500-140000. Spawning is common in late September-early October. The food spectrum usually consists of the following objects: chironomid larvae, plants, mollusks, fish eggs and copepods. By the nature of power - benthophage, but often becomes planktonic organisms. Conclusions. Important food fish, but its reserves significantly reducedunder the influence of anthropogenic factors in recent years. The catch of whitefish can be increased as a result of the development of aquacultur

Topics: AGE, SEXUAL MATURITY, ABSOLUTE FECUNDITY, SPAWN, FOOD SPECTRUM, BENTHOPHAGE, PLANKTON ORGANISMS, ANTHROPOGENIC FACTORS, General Works, A
Publisher: Kuban State Agrarian University
Year: 2016
OAI identifier: oai:doaj.org/article:6ce48220418c48a8b6360b6ec2b9b5db
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