中国海洋大学学报（自然科学版）2018，Vol.48Issue(1)：40-48,9.DOI:10.16441/j.cnki.hdxb.20170076
钓钩深度和浸泡时间对东太平洋公海长鳍金枪鱼延绳钓渔获性能的影响研究
Identifying the Catch Characteristics of Albacore Tuna (Thunnus alalunga)Longline Associated with the Depth and Soaking Time of Hooks in the High Seas of Eastern Pacific Ocean
摘要
Abstract
For the intention of further understanding the fishing capability and catch characteristics associated with gear and fishing operation,this study,on the basis of tuna longline fishery-dependent data from a survey in the high seas of eastern Pacific Ocean spanning from September 2015 to February 2016,performed the locally weighted regression and linear regression of hook depths to the fork length distribution,and statistics of at-vessel survival rate grouped by hooks number and fork length,as well as the dynamic response of catch rate over the period of soaking based on a logistic regression model.The results showed that,despite a less powerful relationship,the fish size remained to increase with the hooking depth.Hook No.8 located at a critical depth that the fork length of albacore tuna caught above this depth was significantly smaller than that bellow this depth.At-vessel survival rates showed evidently positive dependence with the hook depth and fork length.Catch rate responding to the soaking time based on eleven consecutive floats as unit to calculate exhibited a growth in fluctuation with bimodal characteristics at period of 11 and 16 h.Logistic regression model suggested a significant effect of hook depth on the catch efficiency.The water layer for the highest density of catch efficiency located at depth of 167.57 m.An alternative strategy with the hooks deploying at depth ranging from 124 to 211 m will result in a more considerable fishing efficiency.关键词
金枪鱼延绳钓/钓钩深度/浸泡时间/捕捞率/渔获特征Key words
tuna longline/hook depth/soaking time/catch rate/catch characteristics分类
农业科技引用本文复制引用
刘莉莉,周成,虞聪达,郑基,臧迎亮..钓钩深度和浸泡时间对东太平洋公海长鳍金枪鱼延绳钓渔获性能的影响研究[J].中国海洋大学学报（自然科学版）,2018,48(1):40-48,9.基金项目
浙江省公益技术研究社会发展项目(2016C33083) （2016C33083）
国家自然科学基金青年基金项目(41606110 （）
41506151) （）
浙江省自然科学基金青年基金项目(LQ14C190002) （LQ14C190002）
2015年东太平洋公海金枪鱼资源探捕项目资助 Supported by Social Development Project of Zhejiang Public Welfare Technology Research (2016C33083) （2016C33083）
National Natural Science Foundation (41606110 （）
41506151) （）
Natural Science Foundation of Zhejiang Province (LQ14C190002) （LQ14C190002）
Project for High Seas of East Pacific Ocean Resources Exploration in 2015 （）
