滇池产太湖新银鱼食性与摄食行为的初步研究

太湖新银鱼Ｎｅｏｓａｌａｎｘ ｔａｉｈｕｅｎｓｉｓ Ｃｈｅｎ于１９７９年移植滇池，现已成为滇池鱼类的优势种和渔业主体，据１９９０年１０月至１９９１年８月的标本（全长２４－８５ｍｍ）分析结果表明，该银鱼为典型的浮游动物食性鱼类，食物组成不随个体大小而变化。同时表明，太湖新银鱼的摄食有明显的选择性，主要依浮注入动物的个体大小选食，而浮游动物的逃跑能力，运动方式和可见度等则对太湖新银鱼的摄食行为影响不大

FOOD AND FEEDING BEHAVIOR OF ICE-FISB(NEOSALANX TAIHUENSIS CHEN) IN DIANCHI LAKE

Ice-fish, Neosalanx taihuansis Chen, became a dominant species and main commercial goal fish after being introduced into Dianchi Lake in 1979. Food and feeding behavior of the fish(total length 24-85mm)had been studied during the pariod of Oct. 1990-Aug. 1991. The results showed that the ice-fish was kind of obligatory zooplanktivorous fish and selective feeders. Prey size was a key factor determining the prey selection by fish and the pigmentation, motion and evasive ability of prey had almost no effect on fish feeding. The fish diet composition Varied as season changing, but no difference was found between different fish body sizes classes.