Effects of Stocking Density on Growth Performance,Nutrient Composition,Gigestion and Antioxidant Activity of Yellow Catfish Pelteobagrus fulvidraco
Yellow catfish(Pelteobagrus fulvidraco)juveniles with initial body weight of(15.11±0.20)g were stocked into six rectangular culture ponds in an aquaculture company in Tanluo Town,Nanning City,Guangxi,at stocking densities of 5 000 ind./667 m2(group A),10 000 ind./667 m2(group B)and 15 000 ind./667 m2(group C),two replicates in each group,and intensively cultured for 180 d to evaluate effects of stocking density on muscle nutrients,and activities of digestive enzymes and antioxidant enzyme.The results showed that the weight gain rate was significantly higher in group A than those in other groups(P＜0.05),and that the specific growth rate was significantly higher in group A than that in group C(P＜0.05),without significant difference between group A and group B(P＞0.05).The feed conversion ratio was shown to be significantly lower in group B than that in group C(P＜0.05),without significant difference with that in group A(P＞0.05).The maximal yield per unit area was observed in group B,significantly higher than those in groups A and C(P＜0.05),and increased by 62.36％and 19.82％compared with groups A and C,respectively.The fish had gradual decrease in muscular crude protein content,and gradual increase in the ash and moisture contents with the increase in culture density,without significant difference among groups(P＞0.05).There was significantly higher crude lipid content in muscle in groups A and B than that in group C(P＜0.05).The maximal activities of lipase,trypsin and amylase were found in group A,significantly higher than those in other density groups(P＜0.05).SOD and CAT activities in liver of yellow catfish were shown to be first increased and then decreased,with the maximal value in group B and the minimal value in group C(P＞0.05),with the increase in stocking density,in conclusion,the stocking density of 10 000 ind./667 m2 is appropriate in the production and breeding with the comprehensive consideration of physiological health and yield benefit.
culture densityPelteobagrus fulvidracogrowth characteristicsphysical and chemical index
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