Chromosome Behavior of Heat Shock Induced Triploid in Fenneropenaeus Chinensis

Triploidy was induced in Chinese shrimp Fenneropenaeus chinensis by 30 ± 0.5℃ heat shock treatment (initiated at 20 min after fertilization) for 10 rain to inhibit the release of PB2 at 18.0℃. The highest triploid rate obtained was 84.5% in nauplius stage. The effect of heat shock treatment on meiosis and cleavage of eggs was investigated in this work aimed to establish efficient procedures for triploid induction and to gain understanding of the mechanism of triploid production. Three pronuclei that could be observed in the treated eggs under fluorescence microscope developed into triploid embryos. Some abnormal chromosome behavior was observed in heat shockedeggs.