METHOD FOR MARKET-GRADE GROWING OF TROPICAL CRAYFISH

摘要

FIELD: agriculture.;SUBSTANCE: method presupposes getting maggots out of roes of females, their growing for a while and further growth pending receipt of marketable product. Total technological cycle is conducted in two stages. During the first stage in autumn period, in industrial conditions maggots of crayfish are received from matured during summer period females which have reached marketable weight. Process of hard roe carrying and maggots hatching is controlled as well as their development with further growth of young crayfish in pools during December - April at high density of placement ranging from 3000 units/m² in the beginning to 300 units/m² in the end of growing in closed system of water supply. Water temperature is maintained at 25-28°C, hydrochemical regimen is preserved within fish rearing norms, intensive alimentation with vegetative and animal feeds is conducted until reaching weight of 15-20 g. During the second stage within spring - summer period, when outside water temperature in open pools is higher than 18°C a bit grown young crayfish are transferred to the pools for marketable growth in intensive or extensive regimens until reaching weight not less than 50-70 g within three - four months from May to September.;EFFECT: ensures getting live crayfish within one year technological cycle.;4 cl, 1 tbl, 1 dwg