Characteristics of reproductive activity of first time mature producers of Australian red-clawed crayfish (Cherax quadricarinatus) and their first generation offspring obtained under industrial conditions

Abstract

The cultivation of aquaculture facilities under controlled conditions consists of several stages — the formation of a breeding stock, the production of offspring and cultivation of marketable products. The duration of each stage depends on the biological characteristics of a particular aquaculture facility and environmental factors. In aquaculture of tropical species, as a rule, installations with a closed water supply cycle are used, which makes it possible to create conditions for their maintenance year-round, depending on the tasks set. At the same time, the organization of the necessary optimal temperature, hydrochemical regime, feeding regime at each technological stage allows you to control, influence and regulate the vital functions of hydrobionts, especially the duration of the reproductive cycle. Special attention is paid to the reproduction of objects. The study of biological and technological features and the creation of technology for reproduction and offspring of the Australian red-lobed cancer in industrial conditions is quite an urgent issue. The purpose of this work was to study the repair and uterine groups of cancers, their reproductive activity, as well as some features of obtaining and rearing young Australian red-lobed cancer in the conditions of ultrasound. The research work was carried out based on the scientific and experimental complex of aquaculture “BIOS” of the Volga-Caspian branch of the VNIRO Federal State Budgetary Institution ("KaspNIRKH"). The temperature conditions of keeping crayfish producers, obtaining, rearing and rearing young crayfish in the ultrasound were studied and their biological indicators were monitored. In the course of the study, the age of producers who showed reproductive activity for the first time and the output of larvae from the female, as well as the size and mass indicators of repair-uterine groups and undergrown juveniles (body weight, body length, absolute gain, etc.).