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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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投喂不同密度卤虫无节幼体对灰海马幼体生长和存活的影响
DOI: 10.3724/SP.J.1145.2012.00617, PP. 617-622
Keywords: 灰海马,卤虫,幼体,饵料密度,生长,存活
Abstract:
为比较投喂不同密度卤虫对灰海马幼体生长和存活的影响，共设3个卤虫无节幼体密度组［5（a）、10（b）和20（c）个/ml］，用初始密度为2尾/l的灰海马幼体进行为期50d的养殖研究.结果显示，总体而言，3个饵料密度对灰海马幼体的存活、生长有显著影响（p<0.05）.在前10d，3组海马间的成活率和生长速度差异均不显著（p>0.05）；d20~50，b、c两组海马的成活率均显著高于a组（p<0.05），而b、c两组之间无显著差异（p>0.05）.d20时，b、c两组的生长速度显著快于a组（p<0.05）；d30往后，a、c两组的生长速度开始加快，随后3组海马生长速度间的差距进一步缩小，直至a组的体质量和体高超过b组和c组（p<0.05），而b、c两组间的差异显著性消失（p>0.05）.随着投放卤虫密度的增加，各时间点水体的ph和溶氧含量呈显著下降的趋势（p<0.05）；c组氨态氮含量显著高于a组和b组（p<0.05）；除第24h外，3组间亚硝态氮的含量差异不显著.综合结果表明，卤虫的最适投喂密度应随着灰海马的生长进行适时调整.从初孵至d10，饵料密度以10个/ml最佳；从d10起，将饵料密度上调至20个/ml；d30后当海马密度降至0.5~1尾/l时，卤虫密度可降至10个/ml左右.图2表1参21
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