摘要
根据2003-2006年每年秋季（9月下旬）在东海北部的渔业资源和温盐度同步调查资料,对小黄鱼（Larimichthys polyactis）和底层温盐度的分布特征进行了研究,并对它们的关系进行探讨。结果表明,东海北部秋季小黄鱼主要分布在大沙、长江口和江外水域。小黄鱼索饵群体主要出现在暖水控制区及其边缘水域：暖水区底层水温22-25℃,底层盐度31.5-33.0;暖水边缘区底层水温14-21℃,底层盐度33.0-34.0。长江口水域是当年生索饵群的主要出现水域,呈高温低盐特征;江外、舟外、沙外水域是隔年生索饵群体的主要出现水域,为低温高盐特征;混合索饵群主要出现在水温和盐度均偏低的南黄海和大沙水域。长江冲淡水和东海暖水势力较强的年份,小黄鱼的分布面较广且CPUE值较高;长江冲淡水中心水温高于25℃的年份,小黄鱼在其影响范围内出现率较高;在黄海冷水团控制的南黄海水域,水温和盐度偏低的年份,小黄鱼的CPUE值也较低。东海北部秋季小黄鱼当年生群体主要在长江冲淡水控制的高温低盐的近海海域索饵;隔年生群体由于对环境的适应性较强,主要在低温高盐的外海水域进行索饵。
Based on data collected from the bottom trawl surveys in autumn over the period 2003 to 2006, the paper analyzed distribution characteristics of small yellow croaker in the northern East China Sea and its relationship with temperature and salinity of bottom water. The results showed that small yellow croaker in the northern East China Sea distributed mainly in the waters of Dasha, Yangtze estuary and Jiangwai in autumn. The feeding stock of small yellow croaker appeared primarily in the area controlled by warm water and its marginal area. The ranges of temperature and salinity of bottom water in the warm waters were 22-25 ℃ and 31.5-33.0, respectively, while they were 14-21 ℃ and 33.0-34.0 in marginal area of warm water correspondingly. The feeding stock composed of YOY stock appeared primarily in the waters of Yangtze estuary, where the water was characterized by high temperature and low salinity. The feeding stock composed of age 1＋ individuals appeared mainly in the waters of Jiangwai, Zhouwai and Shawai, where the water was characterized by low temperature and high salinity. The mixed feeding stock appeared mainly in the southern Yellow Sea and the waters of Dasha, where the water was characterized by low temperature and low salinity. There were obvious effects of ocean current and water masses on distribution of small yellow croaker. When the strength of Yangtze River diluted water and East China Sea warm water got strong, the distribution scope of small yellow croaker was rather wide and biomass index of the stock was quite high; when the temperature of the center of Yangtze River diluted water was above 25 ℃, the appearance frequency of small yellow croaker was quite high in the distribution region affected by diluted water; when the water temperature and salinity were low in the southern Yellow Sea controlled by Yellow Sea cold water masses, the biomass index of small yellow croaker was quite low.The YOY stock individuals were mainly feeding in the offshore sea waters where the water was character
出处
《中国水产科学》
CAS
CSCD
北大核心
2009年第3期348-356,共9页
Journal of Fishery Sciences of China
基金
东海区渔业资源动态监测网资助项目(2006-2007)
国家973计划课题(2005CB422306).
关键词
东海北部
小黄鱼
索饵群
底层温盐度
Northern East China Sea
small yellow croaker
feeding stock
botttom layer temperature and salinity
