两种不同饵料饲喂乌鳢最佳养殖容量研究

摘要

为进一步探索乌鳢池塘养殖最佳容量,设置3个养殖密度(15 000 尾/hm2、30 000 尾/hm2和45 000 尾/hm2),采用冰鲜鱼和配合饲料2种饵料饲喂乌鳢,通过比较分析56 d养殖后的生物学指标、生态学指标、品质指标、鱼类福利指标和经济效益的差异,提出池塘养殖乌鳢的最佳养殖容量.结果表明:随着养殖密度的增加,养殖水体中TN和TP显著增加(P0.05);不同养殖密度和投喂不同饲料对乌鳢肌肉综合性营养无显著性作用(P>0.05);不同试验组乌鳢肝脏的3种免疫相关酶活性无显著性差异(P>0.05),但ACP和AKP呈现随着养殖密度的增加酶活下降的变化趋势;纯利润分析结果显示高密度冰鲜鱼组效益最高,且随着养殖密度增加利润出现显著性差异(P0.05);the activity of ACP and AKP decreased with the increase of culturing density;3) it was indicated that the profit of the group fed with iced fish and 45 000 ind./hm2 was best and there was significant difference between different culturing densities(P<0.05).The result of input-output ratio showed that the group fed with iced fish and 15 000 ind./hm2 was significantly better than other groups(P<0.05).It was concluded that the pond-carrying capability of Channa argus was with 650g/m3 fed with iced fish and 545g/m3 fed with formulated dietary.