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一材料和方法本实验于1977年5月至1978年4月进行。实验用鱼取自武昌东湖水果湖区。用不同网目的刺网每月采样1～2次。全年共收集334尾标本(鲢、鳙各167尾)。用于食性分析的标本鲢68尾,体长18.0～42.0厘米,重118～1550克;鳙42尾,体长18.0～40.0厘米,重155～1,400克。经鉴定标本均属1～1~+龄鲢、鳙鱼,即1977年4月放湖。然后取出整条肠管。按鲤科鱼类肠管分段法,目测前、中、后肠的饱满度,并选取
A material and method of the experiment in May 1977 to April 1978. Experimental fish from Wuchang East Lake Fruit Lake. Gill nets with different networks monthly sampling 1 or 2 times. A total of 334 specimens (silver carp, 鳙 each 167) were collected. 68 specimens of silver carp for food analysis, body length 18.0 ~ 42.0 cm, weighing 118 to 1550 grams; 42 tail, length 18.0 ~ 40.0 cm, weight 155 ~ 1,400 grams. Identified specimens are 1 ~ 1 ~ + silver carp, bighead carp, that is, in April 1977 to release the lake. Then remove the entire bowel. According to the cyprinid carp subsection method, visual inspection before, after, hindgut fullness, and selected