Abstract:

The techniques of security overwintering and early-reproduction of Red Tilapia was studied in this paper .The results showed that the plastic shed was able to keep a higher temperature, which the average temperature was maintained at 28.3℃,and there was 8.1℃ higher than that of the outdoor temperature during the experiment .Meanwhile , the average water temperature was maintained at 25.2℃,and there was 6.1℃ higher than that of the outdoor temperature during the period of early-reproduction. The was 93.7% of survival rate of parent fish during the period of overwintering in plastic shed, which was more 13.0% than that of outdoor ponds. The gonad growed at the stage Ⅳ, 3.432% of maturity in mid-February from the stage Ⅲ,0.98% in early January,by 40-50 days of strengthen the nurturing.The spawning accumulated temperature was about 1280.5℃.d. which was less 13.0% than that of outdoor ponds. In addition the gonad of parent fish in plastic shed was mature again by about 40 days of postnatal strengthen the nurturing. 2 months was advanced than that in conventional method, which prolonged the growing period of Red Tilapia and increased output by using the method above. There were more one milion junenile of Red Tilapia in the plastic shed 1# and plastic shed 3# ,which was more 60.6% than that of outdoor ponds from. February to April.