| 瓯江口海域夏秋季蟹类数量分布与环境的关系 |
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| 引用本文： | 徐兆礼.瓯江口海域夏秋季蟹类数量分布与环境的关系[J].水产学报,2009,33(2):237-244. |
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| 作者姓名： | 徐兆礼 |
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| 作者单位： | 中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室,上海,200090 |
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| 基金项目： | 上海市908专项（PJ1-1）、中国近海海洋综合调查与评价专项（908-02-01-03）和国家自然科学基金重大研究计划（No.90511005） |
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| 摘 要： | 本文利用2007年6月和9月瓯江口海域渔业资源调查资料，分析瓯江口蟹类资源密度的分布，及蟹类优势种、水团、水深和水文因子对蟹类数量分布的影响。结果表明，6月和9月蟹类重量密度分别为112.99 kg/km2和73.48kg/km2，尾数密度为16.84×103ind/ km2和3.80×103ind/ km2，资源总量为50845.5 kg和33066.0 kg。蟹类密度分布，在6月调查海域东部高于西部，南部高于北部，高密度区出现在瓯江口洞头群岛外侧，尤其是受台湾暖流影响明显的海域；在9月仅是南部明显高于北部，其他海域分布比较均匀。瓯江径流从瓯江北口下泄，在口外形成冲淡水水团，使瓯江口北侧蟹类密度较低。瓯江口温、盐度环境因子与蟹类重量密度负相关关系显著，与尾数密度不显著。水深与蟹类密度呈错综复杂的关系，并非线性相关关系。日本蟳（Charybdis japonica）是瓯江口蟹类最重要的优势种，三疣梭子蟹（Portunus trituberculatus）是最重要的经济品种。
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| 关 键 词： | 瓯江口 蟹类 优势种 数量 |
| 收稿时间： | 2008/2/21 0:00:00 |
| 修稿时间： | 2008/5/26 0:00:00 |
Relationship of crab density distribution with environment in the Oujiang estuary during summer and autunm |
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| XU Zhao-li.Relationship of crab density distribution with environment in the Oujiang estuary during summer and autunm[J].Journal of Fisheries of China,2009,33(2):237-244. |
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| Authors: | XU Zhao-li |
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| Affiliation: | East China Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences |
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| Abstract: | A study was conducted to define summer and autumn distribution patterns of crabs in the Oujiang Estuary and to relate these patterns to environmental variation. The result indicated that the weight density in June and September were 112.99 and 73.48kg/km2, respectively. Yet, the number densities were 16.84×103ind/ km2and 3.80×103ind/ km2 , respectively. In June, both of weight and number densities in the south-east studied area were higher than those in the west, and that of the south area was higher than that of the north area, in September, however, those in the east area was lower than the west. The crabs continually stayed at outer waters of investigated areas in June, especially in south-east where the water affected by the Taiwan Warm Current, but higher density in south coastal water in September. The low crab density in north waters of the Oujiang estuary was ascribed to the existence of the Oujiang dilute water. Numerically Charybdis japonica was the most important crab species, but Portunus trituberculatus was a critical economical species. The hydrological factors were significantly related with weight density but not significantly with individual density. The total standing stock of crabs decreased from 50845.5 kg in June to 33066.0 kg in September in whole fishing ground. |
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| Keywords: | Oujiang estuary crab dominant species density |
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