一龄草鱼种病害多,发病率高,不少地区一龄鱼种成活率仅为30—40%。草鱼在一龄阶段易死亡的主要原因有:1、夏花个体小,适口天然饵料少。在夏花阶段,草鱼仅能摄食水藻,芜萍等,全长长到10厘米左右时,可食苦草和幼嫩禾本科植物。但在人工喂养条件下,往往不能提供其喜食饵料,致使草 First-age grass carp species disease, the incidence rate is high, in many areas the survival rate of first-time species is only 30-40%. Grass carp in the first age stage are easy to death are the main reasons: 1, summer flowers individual small, palatable natural food less. In the summer flower stage, grass carp can only eat algae, Wu Ping, etc., the full length of about 10 cm, edible bitter grass and young grasses. However, under artificial feeding conditions, they often can not provide their favorite food, resulting in grass