Affiliation:
1. Chinese Academy of Sciences
Abstract
Abstract
The effects of intermittent starvation on the growth, precocity, digestive enzyme activity, feeding and body chemical composition of juvenile Chinese mitten crab Eriocheir sinensis were investigated in two independent experiments. Crabs were reared individually during Experiment I and cultured in aggregate during Experiment Ⅱ. Five treatments were involved in both experiments: crabs in the control group (Group C) were fed continuously; crabs in Group S3, S6, S10 and S15 were starved for 3, 6, 10 and 15 days and then re-fed for 3, 6, 10 and 15 days, respectively. Procedures were then repeated. The precocity rate of Group C was significantly higher than that of the other groups. In Experiment I, the final mean body weight and the mean specific growth rate in dry matter (SGRdm) of groups C and S3 was significantly higher than that of the other groups. In Experiment Ⅱ, the mean specific growth rate in body weight (SGRw) in Group C was similar to that of groups S3, S6 and S10, but significantly higher than S15. Crabs in groups S3, S6 and S10 compensated for starving-induced growth depression after being re-fed, and compensatory growth was realized by both higher feeding rate and improved feed efficiency. There was no significant difference in trypsin and alkaline phosphatase activity among treatment groups and the control. However, steapsin and amylase activity were significantly affected by starvation period. There was no significant difference in dry matter, ash and protein content among groups C, S3, S6 and S10 in Experiment I. Collectively, results demonstrated that proper intermittent starvation was sufficient for reducing the precocity rate of cultured juvenile E. sinensis, and we recommend subjecting juvenile crabs to intermittent fasting for 6 to 10 days to maintain precocity rates at acceptable levels without inhibiting growth and yield.
Publisher
Research Square Platform LLC
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