长江河口区仔稚鱼资源现状的调查  

Investigation on the Resources Status of Fish Larvae and Juveniles in Yangtze Estuary Area

作　　者：韩璐[1] 戴小杰[1] 杨红[1] 焦俊鹏[1] 

机构地区：[1]上海海洋大学海洋科学学院,上海201306

出　　处：《安徽农业科学》2009年第13期6023-6026,共4页Journal of Anhui Agricultural Sciences

基　　金：上海近海海洋综合调查与评价(上海市"908"专项);(PJ-2HD3)项目资助

摘　　要：2006年7月至2007年11月,对长江河口水域4个航次仔稚鱼的种类组成和数量分布、表层水温、盐度的分布特征以及它们之间的关系进行了调查。结果表明,该海区共出现仔稚鱼22种,隶属6目7科18属;其中,1种仅鉴定到属,还有2种未能鉴定。春季主要的优势种为鱼,占春季仔稚鱼总数的77.64%;夏季主要优势种为凤鲚,占夏季仔稚鱼总数的88.13%。水温是影响仔稚鱼分布的主要原因之一,而采获的大部分仔稚鱼都属于广盐性鱼类。与历史同期资料相比,经济性鱼类在种类上和数量上都有所减少,低价值鱼类比例的增加成为调查区仔稚鱼资源结构的变动趋势,表明长江河口水域经济种类仔稚鱼资源已受到严重的威胁。The species composititon, quantitative distribution, the distribution characteristics of surface water temperature and salinity and their correlation of four cruises of fish larvae and juveniles in Yangtze River estuary water areas from July of 2006 to November of 2007 were investigated. The results showed that there were 22 species of fish larvae and juveniles in this sea area, belonging to 6 orders, 7 fatuities and 18 genera. One species was identified to genus level and 2 species were unidentified. Liza haematocheilus was the dominant species in spring, accounting for 77.64% of the total number of fish larvae and juveniles in spring. Coilia mystus was the dominant specie in the summer, accounting for 88.13 % of the total number of fish larvae and juveniles in the summer. Water temperature was one of main causes that affected the distribution of fish larvae and juveniles. Most species of fish larvae and juveniles belonged to euryhaline fish. Compared with the historical data, the species and quautity of economic fish larvae and juveniles dropped. However, the increased percentage of low - value fish larvae and juveniles became the change trend of fish larvae and juveniles resources structure in the survey areas, which showed that economic fish larvae resources of Yangtze River estuary waters were under serious threat.

关 键 词：长江河口 仔稚鱼 数量分布 表层水温 表层盐度 

分 类 号：S931[农业科学—渔业资源]