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饵料密度对南方鲶仔稚鱼生长、成活、残食的影响

DOI: 10.3724/SP.J.1145.2010.00235, PP. 235-239

Keywords: 南方鲶,仔稚鱼,饵料密度,生长,成活,残食

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Abstract:

以枝角类为饵料,分两阶段研究了饵料密度对2~30日龄(daysafter-hatching,dah)南方鲶仔稚鱼生长、成活、残食的影响.前期阶段:2~6dah仔鱼,分为未投饵组和投饵组,投饵组的饵料密度设为250、500、1000、2000个/l;后期阶段:7~30dah稚鱼,饵料密度设为250、500、1000、2000、4000个/l.结果表明:前期阶段,250个/l饵料密度组仔鱼生长最快,终体重为0.055g;未投饵组的仔鱼残食十分严重,残食率高达60%;500个/l饵料密度组的仔鱼成活率最高,达95.56%.后期阶段,2000个/l饵料密度组稚鱼生长最快,终体重为1.57g;250、500个/l饵料密度组稚鱼的残食较为严重,当饵料密度增加至2000个/l时,残食率下降至10.00%,成活率达到83.33%.随饵料密度的增加,两试验阶段仔稚鱼的特定生长率(specialgrowthrate,sgr)均呈先增加后降低的趋势,全长变异系数呈下降趋势.综合生长和成活两项指标,2~6dah仔鱼的适宜饵料密度为500个/l,7~30dah稚鱼的适宜饵料密度为2000个/l.饵料不足引发的严重残食,是南方鲶苗种成活率低的重要原因.适宜的饵料密度能够有效地控制残食.图2表2参27

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