【摘要】 以“东海区虾蟹资源调查”课题在1998年8月和1999年2月获得的东海水文、虾类调查资料为基础,结合参考资料,对东海北部海区(30°N以北、128°E以西)的葛氏长臂虾密度分布规律进行了分析,对硝酸盐浓度分布进行了研究。虾类调查采用单船桁杆式拖网扫海,调查时间与硝酸盐采样同步。结果发现:(1)硝酸盐浓度分布受长江冲淡水影响很大,夏、冬有别;(2)夏、冬季葛氏长臂虾的密度分布均与硝酸盐浓度分布成反比关系,且吻合较好;(3)葛氏长臂虾的密度分布在很大程度上取决于长江冲淡水的走向。更多还原

【Abstract】 Based on the hydrological and shrimp survey data got in Aug.1998 and in Feb.1999 from the project Shrimp & Crab Resource Survey in the East China Sea and related materials,the density distribution pattern of shrimp Palaemon gravieri in the northern fishing areas of the East China Sea,south to 30°N and east to 128°E,was analyzed;and the nitrate concentration distribution was studied.During surveying the shrimp,a single-ship beam-type trawl net was used,mean while nitrate Concentration was determined.Results showed that(1)the nitrate concentration distribution was highly affected by the Yangtze River diluted water and there was significant difference in the concentration distribution in summer and winter;(2) the density distributions of Palaemon gravieri were an exact adverse relation to the nitrate not only in summer but also in winter;(3)Palaemon gravieri density distribution largely depended on the on-going direction of Yangtze river diluted water.更多还原