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The objective was to determine the optimum effective phosphorus demand for juvenile snakeheads and to investigate the effects of different levels of NaH2PO4 on the growth, serum biochemical parameters and nutrient composition of juvenile snakeheads. Six diets with different levels of NaH2PO4 (0.41%, 0.64%, 0.86%, 1.09%, 1.31% and 1.57%, the 0.41% group being the control group) were prepared and fed to juvenile snakeheads for 8 weeks, with three replicates of 540 fish in each group, to determine their growth, serum biochemical parameters and nutrient composition. Specific growth rates, protein efficiency and whole fish phosphorus content were fitted separately using a regression linear model to determine their optimum effective phosphorus requirements. The results showed that specific growth rate and protein efficiency ratio were obvious higher than those of the control group when the available phosphorus content rise to 0.86% and 1.09%, respectively, and the feed efficiency showed the same trend (P<0.05); the viscerosomatic index showed general downward trend when upward trend occurs in available phosphorus concentration (P<0.05). The phosphorus content of whole fish rise evidently at 1.09% of the available phosphorus content, then start to ebb gradually. With the continuous addition of the available phosphorus in dietary, the ash and phosphorus were moved up slightly which deposit in vertebrae and scales (P<0.05). In contrast, the crude lipid content of the control group was evidently higher than added group (P<0.05). LDL-C, HDL-C, TC and TG decreased evidently with the increase of available phosphorus content in the dietary (P<0.05). Superoxide dismutase activity increased with increasing available phosphorus in the dietary(P<0.05). Based on the parabolic regression analysis of specific growth rate, protein efficiency, and total phosphorus content in snakehead, the optimal effective phosphorus contents were determined to be 0.98%, 1.06%, and 1.19% respectively. To reduce the risk of eutrophication in the aquaculture environment, the recommended available phosphorus content for snakehead dietary is 0.98%. [ABSTRACT FROM AUTHOR]

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