摘要
在循环养殖系统中设置四种溶氧水平,分别为7.05、8.82、11.84和15.80 mg/L,其中8.82 mg/L为对照组,对虹鳟幼鱼（体长13.0-18.5 cm）的代谢水平及生长率进行了研究。结果表明,饲养30 d后7.05mg/L的低溶氧使虹鳟幼鱼耗氧率和排氨率下降,11.84和15.80 mg/L溶氧下饲养的鱼耗氧率明显增加,15.80 mg/L使鱼的排氨率显著高于对照组。并且11.84和15.80 mg/L组虹鳟幼鱼在24 h内都具有高的代谢水平。随着溶氧量提高,虹鳟幼鱼的增重率、特定生长率和饲料转化率均随之升高,表现出生长指标的明显变化。
The metabolic level and growth rate of juvenile rainbow trout （Oncorhynchus mykiss ） under four dissolved oxygen concentration （7.05 mg/L,8.82 mg/L of 100% saturation, 11.84 mg/L and 15.80 mg/L, respectively ）were investigated . The fish （ mean initial body lenth 13.0 - 18.5 cm ） was reared in closed recirculated water for 30 days . The results showed the rates of oxygen consumption and ammonia excretion reduced obviously in fish experiening hypoxia condition （7.05 mg/L）. At hyperoxic conditions （ 11.84 and 15.80 mg/L） , the rates of oxygen consumption increased significantly, and the rates of ammonia excretion were much higher at hyperoxic （ 15.80 mg/L） conditions compared to 8.82 mg/L normoxic saturations. In addition, there were actual changes in growth indexes that the growth gain rate, special growth rate and food conversion efficiency showed a clear enhancing tendency, with the increase of dissolved oxygen.
出处
《上海水产大学学报》
CSCD
北大核心
2007年第5期437-442,共6页
Journal of Shanghai Fisheries University
基金
辽宁省科技厅攻关项目(990368)
农业部"948"资助项目(203112)
关键词
虹鳟
封闭式循环养殖系统
溶氧
代谢
rainbow trout （Oncorhynchus mykiss ）
closed recirculating system
dissolved oxygen concentration
metabolic level
