养殖密度和水温对锦鲤幼鱼存活与生长的影响

    The effects of stocking density and water temperature on survival and growth of juvenile Brocarded carp

    • 摘要: 为探讨养殖密度和水温对锦鲤幼鱼存活与生长的影响,研究设置了5个养殖密度(10、30、50、70、90尾/m3)和5个水温(10、15、20、25、30℃)分别组成试验组,试验周期为30 d。结果表明:10尾/m3和30尾/m3两个养殖密度组除平均末总重外,其它各项指标均无显著差异(P>0.05);当养殖密度大于30尾/m3,随养殖密度的增大,锦鲤幼鱼的平均存活率、末体重、日增重、特定生长率均显著降低(P<0.05),而平均末总重、饵料系数显著升高(P<0.05)。随着水温的升高,锦鲤幼鱼的平均末体重、日增重、特定生长率均呈先升高后下降的趋势,25℃时最高且显著高于其他水温组(P<0.05);饵料系数呈先下降后升高的趋势,25℃时最低。综合考虑饵料系数及单位水体锦鲤产量,锦鲤适宜的养殖水温在25℃左右,静水池塘的放养密度建议在30尾/m3左右。

       

      Abstract: A 30 days breeding test was performed to investigate the effects of stocking density and water temperature on survival and growth of juvenile Brocarded carp.Five stocking density treatments(10,30,50,70,90 fish/m3)and five water temperature treatments(10,15,20,25,30℃)were setted,respectively.The results showed that there were no significant difference in other indexes(P>0.05) except the average final total weight between 10 fish/m3 and 30 fish/m3.When the stocking density was greater than 30 fish/m3 and with the increase of stocking density,the average survival rate,final weight,daily gain and specific growth rate of juvenile Brocarded carp were significantly decreased(P<0.05),but the average final total weight and feed coefficient were significantly increased(P<0.05).With the increase of water temperature,the average final weight,daily gain and specific growth rate of juvenile Brocarded carp showed a trend of increasing first and then decreasing,with the maximum value at 25℃ group and significantly higher than other water temperature groups(P<0.05).But the feed coefficient first decreased and then increased,with the minimum value at 25℃ group.Considering comprehensively feed coefficient and yield per unit water,we suggested that the suitable water temperature and stocking density for Brocarded carp cultured in still water pond were 25℃ and 30 fish/m3.

       

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