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Effects of dietary levels of phosphorus on growth and biochemical composition of Hemibarbus maculates Bleeker

ZHAO Chao-yang1,ZHOU Hong-qi2,CHEN Jian-ming3,XU Pao1,LI Hong-xia1 (1.Freshwater Fisheries Research Center,Chinese Academy of Fishery Science,Wuxi 214081,China;2.College of Aqua-life Science and Technology,Shanghai Fisheries University,Shanghai 200090,China;3.Zhejiang Institute of Freshwater Fisheries,Huzhou 313001,China)  
A study was conducted to investigate the effects of dietary phosphorus levels on growth and biochemical composition of Hemibarbus maculatus Bleeker.Six experimental isonitrogenous and isoenergetic purified diets(casein-gelatin based) were formulated to contain 0.32%,0.58%,0.83%,1.09%,1.35%,1.59% phosphorus with monopotassium phosphate(KH2PO4) as source of phosphorus.Six treatments and triplicate groups of Hemibarbus maculatus Bleeker(initial weight 7.97±0.07 g) were fed to satiation for 8 weeks.The results showed that:(1)Weight gains feed efficiency and hepatosornatic index of Hemibarbus maculatus Bleeker were affected significantly by dietary phosphorus levels(P0.05).Weight gains were improved with increase of dietary phosphorus from 0.32% to 0.83%,But when the level reached 0.83%,the data of higher level group showed no significant difference.A similar trend was observed in the specific growth rate feed efficiency and phosphorus retention coefficient.(2)Whole body muscle and liver composition were significantly affected by the dietary phosphorus levels(P0.05).Whole body lipid contents were decreased with increasing level of dietary phosphorus,however the ash phosphorus and calcium were gradually elevated.The moisture and crude protein content were not remarkably different among treatments.The muscle and liver lipid showed similar patterns as whole body.Experiments indicated abnormal nutritional composition of body and lower growth speed feeding with insufficient phosphorus content feed.It was suggested that total phosphorus content in feed of Hemibarbus maculatus Bleeker was suitable about 0.83%.
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