首页 | 本学科首页   官方微博 | 高级检索  
     检索      

东海区带鱼底拖网昼夜渔获率差异的统计分析
引用本文:严利平,张寒野,程家骅,袁兴伟.东海区带鱼底拖网昼夜渔获率差异的统计分析[J].海洋渔业,2008,30(4).
作者姓名:严利平  张寒野  程家骅  袁兴伟
作者单位:中国水产科学研究院东海水产研究所,农业部海洋与河口渔业重点开放实验室,上海,200090
基金项目:农业部近海资源监测和调查专项基金 , 国家科技支撑计划  
摘    要:以2004年和2005年东海区重点渔场底拖网渔业资源监测资料,从中选取带鱼渔获率作为指标值,并将昼夜不同网次渔获率分成4组,应用最小显著性差异法(LSD)对东海区带鱼昼夜渔获率进行了统计学分析,以揭示带鱼昼夜的活动规律,并利用样本均值的95%置信区间法估算带鱼昼夜渔获率的差异程度,为东海区渔业资源大面定点调查带鱼昼夜网次间渔获率的差异修正提供量化指标。结果表明,东海区带鱼昼间与夜间的渔获率具有统计学上的显著性差异,昼间的渔获率显著地高于夜间的渔获率,带鱼昼间栖息于底层和近底层,夜间垂直移动到中上层;使用拖网规格为100◇×4 m/88 m、网囊网目为25 mm的调查网具,2004年昼间和夜间带鱼渔获率均值的95%置信区间分别为:220.89±12.94和128.23±10.75;2005年昼间和夜间带鱼渔获率均值的95%置信区间分别为:176.28±20.63和105.23±9.71;取2年带鱼昼夜差异程度的平均值,最保守的估计是昼间网次的渔获率均值是夜间的1.69倍。本研究从统计学分析角度证实了以往的无量化的带鱼昼夜渔获率存在差异的观察结果,推断了带鱼具有昼夜垂直移动的习性,其意义在于利用LSD法可以分析其它鱼种的昼夜栖息特征并提供昼夜渔获率均值差异程度的量化指标。

关 键 词:东海区  带鱼  昼夜差异  渔获率  底拖网  LSD检验

Statistic analysis on circadian difference of catch rate of hairtail in the East China Sea
YAN Li-ping,ZHANG Han-ye,CHENG Jiang-hua,YUAN Xin-wei.Statistic analysis on circadian difference of catch rate of hairtail in the East China Sea[J].Marine Fisheries,2008,30(4).
Authors:YAN Li-ping  ZHANG Han-ye  CHENG Jiang-hua  YUAN Xin-wei
Abstract:Based on the data collected from bottom trawl surveys conducted in the East China Sea during 2004-2005,this paper is discussed on the analysis of the circadian difference related with the catch rate of hairtail in the East China Sea.The catch rates obtained at the different time points of one day were divided into four groups.With a confidence level of 95%,the difference between the four groups was tested statistically by using LSD test.It could be recognize the circadian moving regularity of hairtail and grasp the method how to transform the survey data collected at different time of one day.The results showed that there was significant difference of diel catch rate variation.Hairtail inhabited at the bottom or near bottom,while it migrated vertically to surface of the water.The catch rate obtained in the daytime was significantly greater than that obtained at night.The 95% confidence interval for the mean catch rate of hairtail in the daytime and night were 220.89±12.94 and 128.23±10.75 respectively in 2004,176.28±20.63 and 105.23±9.71 respectively in 2005,the conservatively estimated average catch rate of hairtai conducted with the pair-trawlers in the day was 1.69 times greater than that conducted at night.It could be inferred there diel vertical migration patterns.The analysis was statistically confirmed that there may be deviation of former research results with lack of quantitative analysis of value differences of mean catch rate.The significance of this paper was that a quantitative index was proposed to evaluate differences degree of the mean values of catch rate between daytime and night,and it could be used to analyse the diel distribution patterns for other species by using LSD test.
Keywords:Hairtail  the East China Sea  bottom trawl  circadian moving regularity  catch rate  LSD test
本文献已被 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号