Effects of light intensity on molting, growth, precocity, digestive enzyme activity, and chemical composition of juvenile Chinese mitten crab Eriocheir sinensis
Li, X.; Li, Z.; Liu, J.; Zhang, T.; Zhang, C. (2011). Effects of light intensity on molting, growth, precocity, digestive enzyme activity, and chemical composition of juvenile Chinese mitten crab Eriocheir sinensis. Aquacult. Int. 19(2): 301-311. https://dx.doi.org/10.1007/s10499-010-9414-8
In: Aquaculture International. Springer: London. ISSN 0967-6120; e-ISSN 1573-143X, more
Also appears in:Le Vay, L.; Zeng, C.; Sorgeloos, P. (Ed.) (2011). International Symposium on aquaculture, biology and management of commercially important crabs. Aquaculture International, 19(2). Springer: Dordrecht. 215-394 pp., more
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| Keywords |
Composition > Chemical composition
Enzymatic activity
Light intensity
Population functions > Growth
Eriocheir sinensis H. Milne Edwards, 1853 [WoRMS]
Brackish water |
| Author keywords |
Chemical composition; Enzyme activity; Eriocheir sinensis; Growth; Lightintensity; Precocity |
| Abstract |
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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