目前在鱼种生产上,最感“头痛”的是一龄草鱼病害多,成活率低,其成活率一般只有百分之几。究其原因,主要有三个方面:一是草鱼贪食,在食性转换过程中缺乏适口饲料,容易得病;二是与要求肥水的鲢、鳙鱼混养,受水域环境的影响;三是受到水体中病害的侵袭。有关防治草鱼病害的研究在国内已有许多报道,例如用中草药防病,进行免疫注射与浸泡免疫等措施,对提高草鱼的成活率都有很好的效果。但是要把这些方法广泛用于大面积生产上,尚有一定的困难,笔者认为,要提高一龄草鱼的成活率,必 Currently in the production of fish species, the most “headache” is the first-age grass carp more diseases, low survival rate, the survival rate is generally only a few percent. There are three main reasons for this: First, grass carp bulimia, lack of palatability feed in the process of food conversion, easy to get sick; Second, with the requirements of fertilizer, silver carp, bighead carp polyculture, affected by the water environment; Third, by the water In the invasion of disease. The prevention and treatment of grass carp diseases have been reported in many places in our country. For example, the prevention and cure of grass carp, immune injections and soaking immunization are all effective measures to improve the survival rate of grass carp. However, these methods should be widely used in large-scale production, there are still some difficulties, I believe that to improve the survival rate of the first age grass carp will