| 广东大鹏湾虾拖网网囊网目选择性研究 |
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| 引用本文： | 张健,孙满昌,罗炎标.广东大鹏湾虾拖网网囊网目选择性研究[J].海洋渔业,2007,29(2):166-173. |
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| 作者姓名： | 张健 孙满昌 罗炎标 |
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| 作者单位： | 1. 上海水产大学海洋学院,上海,200090
2. 广东省水产学校,广州,510320 |
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| 基金项目： | 高等学校博士学科点专项科研项目
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上海市重点学科建设项目
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上海水产大学校科研和教改项目 |
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| 摘 要： | 虾拖网渔业是南海海域重要的作业方式之一,但尚未有关该渔业网目尺寸选择性的报道。为评价虾拖网渔具的渔获性能、合理利用虾类资源,在广东大鹏湾进行了网目选择性试验。试验采用双支架虾拖网作为试验网具,并使用套网法估算了网目内径为35、40和45 mm的网囊对主捕虾类的选择性。结果显示,虾类渔获中刀额新对虾、须赤虾、周氏新对虾和日本囊对虾渔获数量较多,比较以往资料,刀额新对虾和周氏新对虾优势体长、平均体长均有所下降,其它2种虾类平均体长未见明显变化;选择性分析结果显示,主捕虾类的L50随网目尺寸线性增大。根据试验结果并结合历史资料,笔者认为现阶段35 mm的网囊网目尺寸对于保护上述4种虾类资源是比较合适的。
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| 关 键 词： | 大鹏湾 虾拖网 网目选择性 刀额新对虾 须赤虾 周氏新对虾 日本囊对虾 |
| 文章编号： | 1004-2490（2007）01-0166-08 |
| 修稿时间： | 2006-07-05 |
Size selectivity of shrimp trawl in Gulf of Dapeng of Guangdong Province |
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| ZHANG Jian,SUN Man-chang,LUO Yan-biao.Size selectivity of shrimp trawl in Gulf of Dapeng of Guangdong Province[J].Marine Fisheries,2007,29(2):166-173. |
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| Authors: | ZHANG Jian SUN Man-chang LUO Yan-biao |
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| Abstract: | Although shrimp trawl fishery is one of important fisheries in the South China Sea,very little is known about the size selectivity of the fishing gear.In order to assess the catching efficiency of shrimp trawl,which is useful to reasonable utilization of the shrimp resources,selectivity experiments were conducted in the Gulf of Dapeng.The selectivity of codends with different mesh sizes,35mm,40mm and 45mm,of double rigged shrimp trawl,which is used in locally commercial fishery,were analyzed through cover-net method selective experiments.The result demonstrated that Metapenaeus ensis,Metapenaeopsis barbata,Metapenaeus joyneri and Marsupenaeus japonicus dominate the shrimp catch.Compared to the previous investigations,predominate BLs(body length) and average BLs of Metapenaeus ensis and Metapenaeus joyneri have declined tremendously and those of Metapenaeopsis barbata and Marsupenaeus japonicus were changed insignificantly.The selectivity analysis showed that the L50s increased with mesh size linearly.According to the results,the authors suggested that codend with 35mm mesh size is desirable for releasing juvenal shrimp. |
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| Keywords: | Gulf of Dapeng shrimp trawl size selectivity Metapenaeus ensis Metapenaeopsis barbata Metapenaeus joyneri Marsupenaeus japonicus |
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