在胃含物分析的基础上 ,1998年 9月～ 1999年 9月对人工养殖湖泊武湖日本沼虾的食性作了研究。结果表明 :日本沼虾是一种广食性、杂食性的动物 ,其主要食物是植物碎片和有机碎屑 ,其次为水生昆虫、水生寡毛类、鱼虾和浮游动物 ,浮游植物仅为日本沼虾摄食时所带入 ;日本沼虾的食物组成具有明显的季节性变化 ;大、中、小三种规格的日本沼虾之间存在明显的食性分化 ;摄食强度存在明显的周年变化 Based on the analysis of gastric contents, the feeding habits of Japanese marsh shrimp in Wuhu, a lake of artificial culture, was studied from September 1998 to September 1999. The results showed that: Macrobrachium nipponense is a kind of polyphagous and omnivorous animal whose main food is plant debris and organic debris, followed by aquatic insects, aquatic oligochaetes, fish and shrimp and zooplankton, and phytoplankton is only Japanese marsh The food composition of Macrobrachium nipponense had obvious seasonal changes. There were significant differences in diet between Macrobrachium nipponense, Macrobrachium nipponense and Macrobrachium nipponensis