Authors: Tan, Qingsong¹; Wang, Fen¹; Xie, Shouqi²; Zhu, Xiaoming²; Lei, Wu²; Shen, Jianzhong¹

Source: Aquaculture Research, Volume 40, Number 9, June 2009 , pp. 1011-1018(8)

Publisher: Wiley-Blackwell

Abstract:

An 8-week growth trial was carried out in a semi-recirculation system to investigate the effect of high dietary starch levels on the growth performance, blood chemistry, starch utilization and body composition of gibel carp (Carassius auratus var. gibelio). Five isonitrogenous and isocarloric experimental diets were formulated to contain different starch levels (24%, 28%, 32%, 36% and 40% respectively). Triplicate groups of fish (24 fish per tank with an average body weight, of 8.5 g) were assigned to each diet. The results showed that dietary carbohydrate levels significantly affected the growth performance, hepatopancreatic lipid content, pyruvate kinase (PK) activity and whole-body lipid content. Growth performance, body crude lipid and plasma glucose concentrations showed a decreasing trend with an increase in dietary starch from 24% to 40%. Pyruvate kinase activities and hepatopancreatic lipid content showed an increasing trend with the dietary starch increasing from 24% to 32%, and then a decreasing trend with the dietary starch increasing from 32% to 40%. No significant difference in the hepatopancreatic hexokinase (HK) activity, plasma triglyceride contents, body crude protein, ash and calcium (Ca) and phosphorus (P) contents was observed between different treatments. In conclusion, higher dietary starch levels (32-40%) significantly (P<0.05) decreased the growth of gibel carp in the present study.

Keywords: corn starch; gibel carp; growth performance; blood biochemistry; hepatopancreatic lipid contents; body composition; pyruvate kinase; hexokinase

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1365-2109.2009.02184.x

Affiliations: 1: Fisheries College, Huazhong Agricultural University, Hubei, China 2: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, the Chinese Academy of Sciences, Hubei, China

Publication date: 2009-06-01

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