象山港黑鲷的摄食习性

分析了６９１尼黑鲷（其中成体１５８尾，Ｉ＋龄和当龄鱼５３３尾）的胃含物，其食物种类分属１４大类７４种；成体以贝类、短尾类为主，Ｉ＋龄和当龄鱼以多毛类、０足类、长尾类为主；在港内不同区域黑鲷性有所不同，成体在港底部以贝类为主，中部南岸以贝类、小型短尾类为主，北岸以小型短尾类、口足类为主，港口部以小型短尾类、小型长足类为主；１“龄和当龄鱼在港底部以小型鱼类、多毛类、贝类、口足类为主，港中部南岸以小型短尾类、贝类、口足类为主，北岸以小型鱼类、贝类为主．这一结果与生物类群自然分布基本吻合，说明其摄食习性是对环境长期适应的结果．胃饱满度成鱼为７５．３２％、幼鱼为５７．９５％．摄食率全年平均为６６．００％，其中１１月到次年１月、４～６月在７０．００％以上．

Food Habit of Black Pargy (Sparus macrocephalus)in Xiangshan Port

The food habit of 691 Black Porgy (158 fully-grown and 533 young) fromXiangshan POrt was analyzed.Results show that their food was classified into 14 groups74 species. The main food of the fully-grown fish was shellfish and short tall, whilethat of the young fish was brishe worms, oval feet and long tailed. The food habit ofBlack Porgy was diverse in different areas of the pork For the fully-grown fish,themain food was shelltish in the POrt end; shellfish and small-sized short tail nearthe south coast of the port central;small-sized short tail and oral feet near the northcoast of the port center; small-sized short tail and long tail in the port mouth.However,the young fish fed mainly on small-sized fish, bristle worms, oral feet and shellfish inthe port end;small-sized short tail,shellfish and oralfeet near the south coast in the portcenter; small-sized fish and shellfish near north coast in the POrt center. These resultswere in accordance with the natUral distribution of these biological groups. The stomachfull rate was 75.32% and 57.95% for the full-grown fish and the young fish,respectively. The average food absorbing rate was 66.00% annually, but it was morethan 70.00% in November to January of next year and April-June.