Abstract
To evaluate the dietary copper (Cu) requirement of Cynoglossus semilaevis, inorganic Cu (0, 2, 6, 17, and 50 mg kg−1) was added to the basal diet, providing actual dietary Cu (5.91, 8.23, 11.78, 24.16, and 56.34 mg kg−1). Each diet was fed to C. semilaevis Günther (initial body weight, 68 g) in triplicate groups for 8 weeks in a flow-through system. The results showed that weight gain rate (WGR), specific growth rate (SGR), feed conversion rate (FCR), and protein efficiency ratio (PER) in fish supplemented with 11.78 mg kg−1 were significantly higher than those in fish fed with the basal diet (P < 0.05), and no significant difference was observed in fish fed dietary Cu ranging from 11.78 to 56.34 mg kg−1 (P > 0.05). The activities of protease, amylase, lipase, copper–zinc superoxide dismutase (Cu–Zn SOD), and lysozyme first increased and then decreased with the increasing dietary Cu concentrations, and 11.78 mg kg−1 diet provided maximum activities. The optimum requirement of C. semilaevis for dietary Cu was estimated to be about 11–12 mg kg−1 diet using broken-line regression analysis, based on the growth and enzyme activities.
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Acknowledgments
The financial support provided by National “Twelfth Five-year” Science and Technology Support Project (Grant No. 2011BAD13B07), National Spark Plan Project (2012GA610003), and Science and Technology Planning Project of Tianjin (12ZCDZNC05900, 11ZCKFNC00400, 20120625, TD12-5018) is gratefully acknowledged.
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Wang, Q., Zhang, Y., Bai, D., Chen, C., Guo, Y., Xing, K. (2015). Estimation of Dietary Copper (Cu) Requirement of Cynoglossus semilaevis Günther. In: Zhang, TC., Nakajima, M. (eds) Advances in Applied Biotechnology. Lecture Notes in Electrical Engineering, vol 332. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-45657-6_26
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DOI: https://doi.org/10.1007/978-3-662-45657-6_26
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