东太平洋公海长鳍金枪鱼延绳钓渔获特征的研究
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- 英文论文题名：Identifying the catch characteristics of albacore tuna(Thunnus alalunga) fishing by longline in the high seas of eastern Pacific Ocean
- 论文作者：周成 ; 虞聪达 ; 郑基 ; 臧迎亮
- 英文论文作者：ZHOU Cheng ; YU Congda ; ZHENG Ji ; ZANG Yingliang ; Zhejiang Ocean University ; Fisheries College ; Key Laboratory of Marine Fishery Equipment and Technology of Zhejiang
- 年：2016
- 作者机构：浙江海洋大学水产学院;浙江省海洋渔业装备技术研究重点实验室;
- 论文关键词：金枪鱼延绳钓 ; 钓钩深度 ; 叉长分布 ; 存活率 ; 渔获率
- 英文论文关键词：tuna longline ; hook depth ; fork length distribution ; survival rate ; catch rate
- 会议召开时间：2016-11-02
- 会议录名称：2016年中国水产学会学术年会论文摘要集
- 语种：中文
- 分类号：S973.31
- 学会代码：OGSB
- 会议名称：2016年中国水产学会学术年会
- 会议地点：中国四川成都
- 主办单位：中国水产学会、四川省水产学会
- 学会名称：中国水产学会
- 页数：1
- 文件大小：530k
- 原文格式：D
- 会议级别：全国
摘要
理解金枪鱼延绳钓的渔获钓捕特性对于提高渔获效率和渔具选择性具有重要意义。本研究利用2015年9月至2016年2月以及2016年4月至9月东太平洋公海长鳍金枪鱼探捕调查数据从钓捕渔获的叉长分布、死亡率以及不同起钩方式下各时段渔获数量等方面对延绳钓钓捕特性进行了分析。其中,不同钩号渔获的叉长频次分布显示随着钩深的增加,所钓获的鱼体大小有略微的增加;不同钩号鱼体存活比率显示钓捕活体率随着钓钩从浅至深而增加;无论从投绳位置出起钩还是从结束位置起钩,起钩的时间不会对渔获数量有显著的影响,即钓捕率在统计学意义上并不随着钓钩浸泡时间的增加而增加;不同钩号的鱼体钓捕数量近似正态分布,位于钓钩分布水层中间的钓钩钓捕率最高,建议通过增加浮子绳长度以及调整投绳速度使钓钩布置在合适的深度。
A realization of high-efficient and selective harvesting has necessity of proper understanding on the catch identities in tuna longline fishery. This study, on the basis of two cruises of longline development fishing in the high seas of eastern Pacific Ocean from September2015 to February 2016 and April 2016 to September 2016, identified the catch characteristics of albacore tuna in terms of fork length distribution, mortality by different hooks, and catch rate at each time of period in different patterns of hook retrieval. Fork length distribution at different hooks show that fish sizes increase slightly with the depth at which was caught. The survival rates of fish increase with its catch depth. The time period of hook retrieval has no noticeable effect on catch rate. Catch number at different hooks is subject to a normal distribution, where hook located at middle layer yield maximum catch rate. It is suggested that the hooks are deployed at proper depth by measures of adjusting the length of float line and line shooter speed.
A realization of high-efficient and selective harvesting has necessity of proper understanding on the catch identities in tuna longline fishery. This study, on the basis of two cruises of longline development fishing in the high seas of eastern Pacific Ocean from September2015 to February 2016 and April 2016 to September 2016, identified the catch characteristics of albacore tuna in terms of fork length distribution, mortality by different hooks, and catch rate at each time of period in different patterns of hook retrieval. Fork length distribution at different hooks show that fish sizes increase slightly with the depth at which was caught. The survival rates of fish increase with its catch depth. The time period of hook retrieval has no noticeable effect on catch rate. Catch number at different hooks is subject to a normal distribution, where hook located at middle layer yield maximum catch rate. It is suggested that the hooks are deployed at proper depth by measures of adjusting the length of float line and line shooter speed.
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