中文摘要：

为了进一步探明长江口沿岸碎波带仔稚鱼的种类组成和多样性特征，2006年7月-2007年6月的每月大潮期间，在长江口沿岸碎波带13个站位点的水深0.5-1．5m处，两人沿海岸平行方向步行拖曳小型拖网（1m×4m，网目1mm）采集仔稚鱼样本。周年共拖网397网次，采集到仔稚鱼49045尾。仔稚鱼隶属于31科，共84种，其中海洋性鱼类16种，河口性鱼类30种，洄游性鱼类4种，淡水性鱼类34种。洄游性鱼类刀鲚占总个体数的82.63％，为最优势种。仔稚鱼的物种数、个体数和丰度在冬季较低，以3月份最低，夏季最高。Margalef丰富度指数2006年11月-2007年4月相对较低，2006年10月最高。Shannon-Wiener多样性指数在10月最高，7月最低。Pielou均匀度指数全年较恒定，2006年7月和2007年6月相对较低。

英文摘要：

This study investigated species composition and diversity of fish larvae and juveniles in the surf zone of the Yangtze River estuary to reveal the importance of this habitat as a fish nursery ground. Fish larvae and juveniles were collected monthly at 13 stations on the spring tide during July 2006 and June 2007. Samples were conducted along the surf zone （depth of 0.5-1.5 m） using a seine net （1 m×4m, 1 mm mesh-aperture）. Each haul was made parallel to the shore for a distance of about 50m. A total of 49045 fish larvae and juveniles were collected representing 84 species from 31 families. They included 16 marine species, 30 estuarine species, 4 diadromous species and 34 freshwater species. Coilia nasus was the most dominant species accounting for 82.63% of the total. The number of species, individual and abundance were lower in winter with the minimum number in March and maximum in summer. The Margalef index was relatively low between November 2006 and April 2007, the highest being in October 2006. The Shannon-Wiener diversity index was the highest in October 2006 and the lowest in March 2007. The Pielou evenness index was invariable throughout the whole year and relatively low in July 2006 and June 2007.