Journal
AQUACULTURE INTERNATIONAL
Volume 19, Issue 2, Pages 301-311Publisher
SPRINGER
DOI: 10.1007/s10499-010-9414-8
Keywords
Chemical composition; Enzyme activity; Eriocheir sinensis; Growth; Light intensity; Precocity
Categories
Funding
- National Natural Science Foundation of China [30830025]
- National Scientific and Technological Supporting Program of China [2007BAD37B03, 2006BAD03B02]
- Chinese Academy of Sciences [KSCX2-YW-N-47-06]
- Ministry of Agriculture of China [200903048-04]
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A 74-day growth trial was carried out to investigate the effects of light intensity on the juvenile Chinese mitten crab, Eriocheir sinensis, under semi-natural conditions. The experiment had three light intensity treatment groups, natural light (NL), middle light (ML), and low light (LL), as light intensity became weaker. The results indicated that light intensity had no significant effect on molting interval and molting frequency but did have a significant effect on the molting weight gain of the crab. Molting weight gain in group NL was significantly higher than that in group LL (P < 0.05). Specific growth rate in weight (SGRw) and in carapace width (SGRcw), weight gain, and final body weight were significantly affected by light intensity (P < 0.05). No significant difference was detected in survival between groups (P > 0.05). The precocious rate in groups NL, ML, and LL was 26.14, 15.48, and 17.14%, respectively. The precocious rate in group NL was significantly higher than that in groups ML and LL (P < 0.05). Chemical composition of the crab body was significantly affected by light intensity, but the activity of alkaline phosphatase, trypsin, and pancreatic lipase was not significantly affected by light intensity. The results indicated that the submitted light intensity was useful in reducing the precocious rate without affecting the normal growth of juvenile E. sinensis.
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