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Abstract To investigate the effects of different diets on nutritive components in the muscle of genetic improvement of farmed Tilapia(GIFT) in high-density fishery mode, the nutritional components in the muscle of the inflated floating feeds group and the common sinking feeds group of GIFT were tested and analyzed with routine methods. The results showed that the contents of crude protein、 crude fat and crude ash in the muscle of the inflated floating feeds group were significantly higher compared with the common sinking feeds group(P＜0.05), while the content of moisture appeared in contradiction(P＜0.05). Eighteen amino acids were found in the muscle of two groups, and significant differences(P＜0.05) in the content of many amino acids were also found between two groups. Contents of delicious amino acid(DAA)、essential amino acid(EAA) and total amino acid(TAA) of the inflated floating feeds group were significantly higher compared with the common sinking feeds group(P＜0.05) . The essential amino acid indexs (EAAI) of two groups were 65.64 and 62.62, respectively, but the inflated floating feeds group was conformed to FAO/WHO criterion only. According to amino acid score(AAS) and chemical score(CS), the first limited amino acid was Trp of two groups, but the second limited amino acids were different. Among the 11 fatty acids, the contents of most saturated fatty acid(SFA) in the inflated floating feeds group were significantly higher compared with the common sinking feeds group(P＜0.05) , while the content of most unsaturated fatty acid(UFA) appeared in contradiction. According to the composition of trace elements in the muscle of GIFT, Zn was the highest content in the inflated floating feeds group, while Fe was the highest content in the common sinking feeds group. In a word, the inflated floating feeds were better than the common sinking feeds. The results of this study provide the basis for the nutritional quality of GIFT of high-density fishery mode.
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Received: 12 April 2013
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