条石鲷耗氧率与窒息点研究

来源 :第一届全国鲆鲽类产业可持续发展研讨会 | 被引量 : 0次 | 上传用户:yuanxb2008
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  2008年4~8月,采用Winkler法研究了70日龄(平均全长37.68mm,平均体重1.07g)和105日龄(平均全长65.71mm,平均体重5.58g)的条石鲷在不同温度(15、20和25℃)、不同盐度(2O、25和30)下的耗氧率、窒息点及耗氧率昼夜变化.结果表明,105日龄组的相对耗氧率明显低于70日龄组,但个体耗氧量明显高于70日龄组;耗氧率随幼鱼体重的增加而相对减少.盐度一定时,温度升高,相对耗氧率和个体耗氧量都随之增大.盐度对70日龄幼鱼组的耗氧率影响显著((P<0.05),对105日龄幼鱼组影响不显著((P>0.05)。盐度25左右、温度20~25℃时是条石鲷苗种培育和生长的最适盐度和最适温度。条石鲷在温度15~25℃、盐度20~30下的窒息点为1.6021~2.9538mg02/L,窒息点随着个体的增大而降低;温度、盐度对条石鲷窒息点的影响均不显著((P>0.05)。条石鲷耗氧率的昼夜变化明显,白天的耗氧率平均为0.9459mg O2/g·h,夜间平均为0.2727mg O2/g·h,白天的耗氧率是夜间的3~5倍,条石鲷白天代谢旺盛并持续到夜间22:00左右。
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