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本文比较了太湖梅梁湾敞水区2004年秋季渔汛期刀鲚(Coilia ectenes)和间下(鱼箴)(Hyporhamphus intermedius)的食性,同时对不同食物的重要性、选择性以及两种鱼类食物的重叠进行了分析．结果表明,秋季刀鲚、间下(鱼箴)的食物主要由浮游甲壳动物、鱼和昆虫等组成．镖水蚤中的指状许水蚤(Schmackeria inopinus)是刀鲚最重要的食物,而间下(鱼箴)最重要的食物是裸腹溞(Moina sp．),而且摄食鱼和昆虫的比例远高于刀鲚．刀鲚和间下(鱼箴)对个体较大的指状许水蚤的选择性都比较高,对个体较小、而在太湖密度很高的象鼻溞(Bosmina spp．)都表现出主动回避．刀鲚与间下(鱼箴)的食物重叠系数较高,表明对竞争比较激烈,但要完全了解这两种鱼类的竞争关系,还要对它们在太湖的分布,不同发育阶段和不同季节的摄食情况进行详细的调查研究．
In this paper, we compared the feeding habits of Coilia ectenes and Hyporhamphus intermedius in Meiliangwan open water area in autumn of 2004, while the importance and selectivity to different kinds of food, Overlaid food was analyzed. The results showed that in autumn, the food of knife-knives and inter-fin fish mainly consists of plankton crustaceans, fish and insects. Schmackeria inopinus is the most important food for Doraemon, and the most important food for Doraemon is Moina sp., And the ratio of feeding fish to insects Much higher than knife 鲚. Dorsal and interlobular (fish Pro) higher individual selectivity for the larger fingers Daphnia magna, smaller individuals, and Bosmina spp. In the Taihu Lake are more active avoid. The higher coefficient of overlap of food between Daojian and Jianxia (Yuzhen) indicates that the competition is fiercer. However, to fully understand the competition between these two species of fish, their distribution in the Taihu Lake, different developmental stages and different seasons The food intake conducted a detailed investigation.