南黄海族小黄鱼昼夜渔获率差异的统计学分析

Statistic analysis on circadian difference of catch rate of small yellow croaker of the southern Yellow Sea school

利用2004年度东海区重点渔场底曳拖网渔业资源监测资料,从中选用小黄鱼网次渔获率作为指标值,应用LSD方法对南黄海族小黄鱼昼夜渔获率差异进行了统计学分析,以揭示小黄鱼昼夜的活动规律。结果表明,小黄鱼在不同的洄游阶段昼夜网次间渔获率无显著性差异,昼夜无垂直移动现象,常年处于底层,为典型的底层鱼类;在利用底曳拖网船进行渔业资源调查时,无需修正昼夜网次间小黄鱼的渔获率,用获取的调查数据即可估算资源量。

Based on the data collected from bottom trawl surveys conducted in 2004, the paper dealed with the analysis on the circadian difference of the catch rate of small yellow croaker in the southern Yellow Sea shcool used LSD test. Through the analysis. It could be recognized the circadian moving regularity of small yellow croaker. The results showed that small yellow croaker is a demersal fish inhabited at the bottom of sea perennially and don＇ t migrate vertically. Statistically, there were no significant differences in the catch rate of small yellow croaker between day and night. So there are no need to transform the survey data when one evaluates the resources of small yellow croaker used the survey data from different colleting time on the same day.