南海区单船有袖单囊拖网网囊网目对金线鱼的选择性研究
S971.4; 金线鱼(Nemipterus virgatus)是南海区拖网渔业的重要经济种类.为提高拖网对金线鱼的选择性,在南海区使用套网法对网目尺寸分别为30、35、40和45 mm的4组网囊开展了试验.使用双重拔靴法拟合网囊对金线鱼的选择性参数和选择性曲线,比较网囊间的选择性差异,并估算网囊的捕捞方式指数.结果显示,随着网目尺寸的增大,50％选择体长(L50)增大,选择性曲线的置信区间变窄,网囊对金线鱼幼鱼的渔获比例减小.试验网囊的L50均小于金线鱼的开捕规格(15.0cm),网囊对金线鱼的抛弃率大于67％.研究表明,增大网目尺寸能够优化网囊的选择性,但选择性仍需进一步提升,才能更好地促...
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| Published in | 南方水产科学 Vol. 20; no. 3; pp. 1 - 7 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国水产科学研究院南海水产研究所/农业农村部外海渔业可持续利用重点实验室,广东广州 510300
01.06.2024
上海海洋大学海洋生物资源与管理学院,上海 201306%中国水产科学研究院南海水产研究所/农业农村部外海渔业可持续利用重点实验室,广东广州 510300 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 2095-0780 |
| DOI | 10.12131/20230227 |
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| Abstract | S971.4; 金线鱼(Nemipterus virgatus)是南海区拖网渔业的重要经济种类.为提高拖网对金线鱼的选择性,在南海区使用套网法对网目尺寸分别为30、35、40和45 mm的4组网囊开展了试验.使用双重拔靴法拟合网囊对金线鱼的选择性参数和选择性曲线,比较网囊间的选择性差异,并估算网囊的捕捞方式指数.结果显示,随着网目尺寸的增大,50％选择体长(L50)增大,选择性曲线的置信区间变窄,网囊对金线鱼幼鱼的渔获比例减小.试验网囊的L50均小于金线鱼的开捕规格(15.0cm),网囊对金线鱼的抛弃率大于67％.研究表明,增大网目尺寸能够优化网囊的选择性,但选择性仍需进一步提升,才能更好地促进金线鱼拖网渔业的可持续发展. |
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| AbstractList | S971.4; 金线鱼(Nemipterus virgatus)是南海区拖网渔业的重要经济种类.为提高拖网对金线鱼的选择性,在南海区使用套网法对网目尺寸分别为30、35、40和45 mm的4组网囊开展了试验.使用双重拔靴法拟合网囊对金线鱼的选择性参数和选择性曲线,比较网囊间的选择性差异,并估算网囊的捕捞方式指数.结果显示,随着网目尺寸的增大,50％选择体长(L50)增大,选择性曲线的置信区间变窄,网囊对金线鱼幼鱼的渔获比例减小.试验网囊的L50均小于金线鱼的开捕规格(15.0cm),网囊对金线鱼的抛弃率大于67％.研究表明,增大网目尺寸能够优化网囊的选择性,但选择性仍需进一步提升,才能更好地促进金线鱼拖网渔业的可持续发展. |
| Abstract_FL | Threadfin bream(Nemipterus virgatus)is an important species in the trawl fishery of the South China Sea.In order to improve the size selectivity and exploitation pattern of single boat bottom otter trawls for N.virgatus,we tested four experi-mental codends with mesh sizes of 30,35,40 and 45 mm by applying the covered codend method in the South China Sea.We analyzed the catch data with double-bootstrapping technique to estimate the selectivity parameters,selectivity curves,delta se-lectivity curves and exploitation pattern indicators.The results demonstrate that with increasing mesh sizes in codends,50％re-tention length(L50)increased,confidence intervals of the selectivity curves became sharper,and retention fraction of under-sized individuals decreased.However,when considering the minimum conservation reference size of the target species(15.0 cm),the L50 values of codends tested were less than 15.0 cm,and their discarded percentages were all over 67％.Though the study shows that increasing mesh sizes will improve size selectivity,it should be further improved to achieve a sustainable trawl fishery for threadfin bream. |
| Author | 张鹏 王腾 李杰 杨炳忠 晏磊 |
| AuthorAffiliation | 中国水产科学研究院南海水产研究所/农业农村部外海渔业可持续利用重点实验室,广东广州 510300;上海海洋大学海洋生物资源与管理学院,上海 201306%中国水产科学研究院南海水产研究所/农业农村部外海渔业可持续利用重点实验室,广东广州 510300 |
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| Author_FL | WANG Teng YAN Lei ZHANG Peng LI Jie YANG Bingzhong |
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| DocumentTitle_FL | Size selectivity of codend-mesh size in single boat bottom otter trawls for Nemipterus virgatus in South China Sea |
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| Keywords | Size selectivity Nemipterus virgatus 网囊网目 Codend mesh 拖网 金线鱼 Trawl 选择性 |
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| Snippet | S971.4; 金线鱼(Nemipterus virgatus)是南海区拖网渔业的重要经济种类.为提高拖网对金线鱼的选择性,在南海区使用套网法对网目尺寸分别为30、35、40和45 mm的4组网囊开展了试... |
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| Title | 南海区单船有袖单囊拖网网囊网目对金线鱼的选择性研究 |
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