在自动溶氧控制系统中设置5～6 mg/L、7～8 mg/L、9～10 mg/L、11～12 mg/L4种溶解氧水平，其中5～6 m g/L为对照组，对大菱鲆（90～110 g ）的生长及生化组分进行了研究。试验结果表明，饲养50 d后，随着溶解氧水平的提高，大菱鲆质量增加率、特定生长率和食物转化率均随之升高，相邻组别差异不显著，但相隔组别差异显著（P＜0．05）。对大菱鲆全鱼体组分分析发现，大菱鲆全鱼体组分中灰分和粗蛋白呈先升高后降低趋势，粗脂肪呈先降后升的趋势，9～10 mg/L组试验鱼粗蛋白含量最高、粗脂肪含量最低，且与5～6 mg/L、11～12 mg/L组差异均显著（P＜0．05）。%The effects of dissolved oxygen levels (DO) (5-6 mg/L as control group ,7-8 mg/L ,9-10 mg/L and 11-12 mg/L) on growth rate and biochemical composition were investigated in turbot (Scoph-thalmus maximus) with initial body weight of 90-110 g reared in an automatically aerating system for 50 days .The results showed that the weight gain rate ,specific growth rate and food conversion efficiency were found increase with the elevated dissolved oxygen levels ,with significant differences in apart groups (P<0 .05) .The whole body analysis revealed that the ash and crude protein contents were first increased and then decreased while the crude lipid content was first decreased and then increased ,the maximal crude protein content level and minimal crude lipid level in the fish between 9-10 mg/L DO group .Significant difference was observed among 9-10 mg/L DO group ,5-6 mg/L group ,and 11-12 mg/L DO group (P<0 .05 ) .
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