Comparison of Growth Performance and Activities of Digestive and Immune Enzyme in Swimming Crab Portunus trituberculatus under Group Rearing and Single Rearing Conditions
The comparison of growth performance and activities of digestive and immune enzymes was conducted in swimming crab Portunus trituberculatus reared under group rearing(GR,10 inds/tank)and single rearing(SR,1 ind/tank)conditions at water temperature of(27±3)℃.The results showed that the cannibalism was serious in GR during the period of molting,with significantly higher total mortality rate and disability rate than in SR(P<0.05).There was significantly higher proportion of molting at night than that in daytim...