| 基于张网渔获的蟹笼渔具对三疣梭子蟹的相对选择性 |
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| 引用本文： | 白伦,张新峰,HE Pingguo,张健.基于张网渔获的蟹笼渔具对三疣梭子蟹的相对选择性[J].中国水产科学,2015,22(2):340-340. |
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| 作者姓名： | 白伦 张新峰 HE Pingguo 张健 |
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| 作者单位： | 1. 大洋渔业资源可持续开发省部共建教育部重点实验室, 上海海洋大学, 上海 201306; 2. 国家远洋渔业工程技术研究中心, 上海海洋大学, 上海 201306; 3. School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, Massachusetts 02744 |
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| 基金项目： | 国家自然科学基金资助项目(31001138); 公益性行业(农业)科研专项(201203018); 上海市教委创新项目(11YZ156) |
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| 摘 要： | 蟹笼渔具是东海近海重要的作业方式,安装释放装置是改善蟹笼渔具选择性的重要技术手段。作者通过海上试验,对比释放口宽度分别为25 mm和30 mm的试验蟹笼、对照蟹笼和张网的三疣梭子蟹(Portunus trituberculatus)渔获,结合渔获方程和SELECT模型分析蟹笼的接触选择性和对张网的相对选择性。试验结果显示,张网渔具所捕获的群体较对照蟹笼更小;对比对照蟹笼渔获分布,分析试验蟹笼的接触选择性,结果显示,50%选择甲宽(l50)和蟹笼的捕捞能力随着释放口宽度的增大而增大,但选择范围(SR)基本不变。对比张网的渔获分布,获得蟹笼对三疣梭子蟹的相对选择性,结合张网和蟹笼的作业特点,将对照蟹笼的相对选择性视为蟹笼渔具的可捕率,结果显示,较大的个体更容易接触并进入蟹笼,50%概率接触并进入蟹笼的个体甲宽为98.7 mm;释放口宽度30 mm的试验蟹笼的相对选择性的l50(118.4 mm)和SR(10.5 mm)与接触选择性的l50(117.4 mm)和SR(9.5 mm)几无差异;对于释放口宽度25 mm的试验蟹笼,接触和相对选择性l50没有差异,但相对选择范围SR(5.6 mm)明显小于接触选择范围(11.3 mm),因此只考虑蟹笼的接触选择性而忽略其可捕率所得的结果可能会产生偏差。根据试验结果,本文对蟹笼渔具的可捕率的描述方式以及与蟹笼作业能力的区别进行了探讨。
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| 关 键 词： | 蟹笼 张网 三疣梭子蟹 矩形释放装置 相对选择性 接触选择性 可捕率 |
| 修稿时间： | 2015/6/29 0:00:00 |
Relative selectivity of crab pots for Portunus trituberculatus based on stownet catch in the East China Sea |
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| BAI Lun,ZHANG Xinfeng,HE Pingguo,ZHANG Jian.Relative selectivity of crab pots for Portunus trituberculatus based on stownet catch in the East China Sea[J].Journal of Fishery Sciences of China,2015,22(2):340-340. |
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| Authors: | BAI Lun ZHANG Xinfeng HE Pingguo ZHANG Jian |
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| Institution: | 1. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China; 2. National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 2013 |
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| Abstract: | The crab pot fishery is one of the most important fisheries in the East China Sea Utilization of escape devices has resulted in improved the size selectivity of pots.We compared the catch frequencies of swimming crab Portunus trituberculatus among experimental crab pots rigged with rectangular escape gaps of 25 mm or 30 mm widths,,control pots,,and control stownets.We then estimated encounter selectivity and relative selectivity based on a catch equation and the selectanalysis model.The size of individuals captured in the stownet was smaller than in the control crab pots. The encounter selectivity of the experimental crab pots was analyzed using the catch frequency of the control pot. The 50% retention carapace width (l50) and fishing power increased whereas the selection range (SR) remained unchanged with an increase in the width of the escape gap. The relative selectivity (catchability) of the crab pots was estimated by comparison with the catch frequency of the stownet.Large crabs were more likely to contact and then enter the crab pots than small crabs and the 50% probability contact carapace width was 98.7 mm. There was little difference in l50 and SR between the relative and encounter selectivity measures for the 30 mm escape gap. The l50 and SR for relative selectivity were 118.4 mm and 10.5 mm, and for encounter selectivity they were 117.4 mm and 9.5 mm, , respectively. There was no difference in l50 between the relative and encounter selectivity measures for the 25 mm escape gap. However, , the SR for relative selectivity (5.6 mm) was significantly less than for encounter selectivity (11.3 mm). Thus, , there would be some bias in population assessment if only the encounter selectivity information was taken into account and information about catchability was omitted.
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| Keywords: | crab pots stownet Portunus trituberculatus rectangle escape gap relative selectivity encounter selectivity catcha-bility |
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