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Effect of Dietary Phosphorus on the Growth and Body Components of Juvenile Synechogobius hasta |
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| Authors: | LUO Zhi LI Xiaodong GONG Shiyuan XI Wenqiu LI Yali |
| Institution: | 1. Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Chinese Ministry of Education, Fishery College, Huazhong Agricultural University, Wuhan 430070, P. R China;Postdoctoral Research Base, Panjin Guanghe Fishery Co. Ltd., Panjin 124200, P. 2. Postdoctoral Research Base, Panjin Guanghe Fishery Co. Ltd., Panjin 124200, P. R. China 3. Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Chinese Ministry of Education, Fishery College, Huazhong Agricultural University, Wuhan 430070, P. R China |
| Abstract: | The effect of dietary, phosphorus on the growth and body, components of juvenile Synechogobius hasta was determined. Different percentages of dietary phosphorus (0.63, 0.77, 0.93, 1.06, 1.22 and 1.36) were tested by feeding the fish (body weight, 15.81 g±0.32 g、20 individuals each group、3 groups each percentage) at a surplus of 5%-10% above sattation for 35d. Dietary phosphorus did not significantly affect the specific growth rate, feed intake, feed conversion ratio and protein efficiency rate. Nitro-gen retention was found to be the highest in fish ted the diet containing 1.06% of phosphorus; however, this was not significantly different from other diets. Fish fed the diet containing 0.93% of phosphorus showed the highest phosphorus retention; similar phos-phorus retention rates were found in fish fed the diets containing 0.77% and 1.06% of phosphorus. Fish fed the diet containing the highest percentage of dietary, phosphorus were found to contain the least whole body lipid, lower than fish ted other diets (P<0.05). The protein content increased from 18.59% to 19.55% (although not significant) with the decrease of body lipid content (P<0.05). The contents of the whole body ash, whole body phosphorus and vertebrae phosphorus increased with dietary, phosphorus percentage up to 1.06 (P<0.05), reaching a plateau after that. Dietary, phosphorus did not significantly influence the muscle components (protein, lipid and moisture). Condition factor and hepatosomatic index were the highest in fish fed the diet containing 0.63% of dietary phos-phorus; however, this was not significantly different from those of other diets. The second-order polynomial regression of phospho-rus retention against dietary phosphorus identified a breakpoint at 0.88% of dietary phosphorus. However, the dietary requirement of phosphorus for maintaining maximum phosphorus storage determined by broken-line analysis of the contents of whole body phos-phorus, and ash and vertebrae phosphorus was 1.06% of the diet. |
| Keywords: | Synechogobius hasta juvenile phosphorus body component growth |
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