【摘要】 据1998年5、8、11月和1999年2月4个月在26°～33°N,127°E以西,水深20～120m的东海中北部大陆架海域,使用桁杆拖虾网进行虾蟹类资源调查所获资料,应用资源密度法首次估算了调查海域主要经济蟹类和总体的现存资源量和MSY,结果是:东海调查海域蟹类总资源量约为18.2×10⁴t,MSY约为21.9×10⁴t。估算出的蟹类现存资源量比当年渔获量略高,表明该海域蟹类资源总体利用不足,尚有一定潜力。文中还讨论了不同蟹类种类资源的不同利用程度,具体是三疣梭子蟹资源已达过度利用,而细点圆趾蟹、锈斑（虫寻）、日本（虫寻）、武士（虫寻）、光掌（虫寻）等蟹类资源则还利用不足,其中细点圆趾蟹是群体数量最大,最具有开发潜力的一种蟹类资源,MSY约为10.1×10⁴t,最高资源密度达3375.0kg·km^-2,为合理开发利用蟹类资源提供了基础资料。更多还原

【Abstract】 Based on the data from the shrimp and crab survey carried out in May, August, November 1998 and February 1999, with beam shrimp trawl net at the water areas located west of 127°E, 26°-33°N, and at the depth between 20 and 120 m in the middle and northern East China Sea continental shelf, the existing crab stock in the surveyed East China Sea continental areas and MSY were assessed by using stock density method for the first time. The results showed that the current crab stock is ca. 18.2×10⁴t and MSY is ca.21.9×10⁴t. The number were a little bit higher than the landings that year, which demonstrated that the crab resources were not fully exploited and was worthy to be further exploited. The density reached its crest in May and the second peak appeared in August and decreased to its valley in February. Geographically, the highest density appeared at water layers between 20-40 m. However, even in the same layer at different areas there was a big discrepancy. That might have been caused by the shift in the abundance of dominant species in different areas at different seasons. In addition, the current stock and MSY of the main economic species were analyzed, and results showed that the species, which had a stock of over 1×10⁴t, were Ovalipes punctatus, Charybdis bimaculata and Portunus trituberculatus; over 0.5×10⁴t was C. japonica ; over 0.3×10⁴t were C. riversandersoni, C.feriatus and C. miles. As far as the exploitation is concerned, Portunus trituberculatus was overfished, while Ovalipes punctatus, C. feriatus, C. japonica, C. miles, C. riversandersoni could be further fished; among which Ovalipes punctatus was of great population and of the greatest exploiting potentiality, with its MSY being 10.1×10⁴t. It mainly inhabited the Yangtze River estuary fishing area, the water layer of 20-40m of Dasha fishing area, Zhouwai fishing area, and the 80-120m waters of the outside of Mingdong fishing area. The highest density would be 3325.0 kg·km^-2, which provided data for the proper exploitation of crab resource.更多还原