1. Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, College of Animal Science, Yangtze University, Jingzhou 434025, China; 2. Jiangxi Academy of Agricultural Sciences, Nanchang 330008, China; 3. Hubei Fisheries Industrial Technology Research Institute, Jingzhou 434026, China
Abstract：Juvenile red swamp crayfish Procambarus clarkii with body weight of (3.11±0.10) g was reared in a 120 cm×60 cm×20 cm aquarium at stocking density of 14 individuals/m2 (group L), 28 individuals/m2 (group M), and 42 individuals/m2 (group H) at water temperature of (25±1) ℃ for 8 weeks in order to investigate the effects of different stocking densities on the growth, feeding, digestive enzyme activity and non-specific immunity of juvenile red swamp crayfish. The survival rate of the crayfish was found to be decreased with the increase in stocking density. There were significantly higher specific growth rate (1.82±0.12)%/d and body weight gain rate (196.73±0.76)% in group M than those in the other two groups (P＜0.05). The positive correlation between feeding rate and stocking density was observed in each group, higher feeding intake rate in group H than that in group L and group M. There were significantly higher activities of digestive enzymes in group M than those in group L (P＜0.05), without significantly different from those in group H (P＞0.05). The non-specific immunity of the crayfish was significantly affected by stoking density (P＜0.05), significantly better in group M than that in the other two groups. The findings indicate that the optimal stocking density is 28 individuals/m2 in juvenile red swamp crayfish culture under the experimental conditions.
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2021, Vol. 40 
