大地回春,草木复苏,水温回升,各种致病因子如细菌、寄生虫等开始活动,使鱼类染病。同时这些致病因子处于发育的初期阶段,对药物较为敏感,疗效好。另外,早春时鱼种、成鱼经过越冬期,体质瘦弱,容易引起鱼病发生。因此,积极做好早春的鱼病防治工作,可减少鱼病的发生,提高成活率和产量。早春主要的鱼病有:在捕捞、清塘等操作过程中,造成鱼种、成鱼鱼体受伤,为细菌的入侵打开了通道,这类鱼病有水霉病、竖鳞病、细菌性烂鳃、赤皮病、打印病等。早春鱼种经过几个月的越冬、体质较差,大量寄生虫容易主动或被动形式侵袭鱼体,侵入鱼鳃引起发炎、鳃丝腐烂的有隐鞭虫病、口丝虫病、单孢子虫病、小瓜虫病、车轮虫病和斜管虫病等;侵入鱼体表和体内寄生引起鱼体消瘦直至造成死亡的有锚头蚤病、鱼虱病等。为了提高养鱼经济效益,早春切莫忽视鱼病 Earth rejuvenation, vegetation recovery, water temperature rise, a variety of pathogenic factors such as bacteria, parasites and other activities began to make fish sick. At the same time these virulence factors in the early stages of development, the drug is more sensitive, good effect. In addition, early spring fish, adult fish through wintering, physical thin, easily lead to fish disease. Therefore, active prevention and treatment of fish diseases in early spring can reduce the occurrence of fish diseases and increase the survival rate and yield. The main fish diseases in early spring are as follows. During the operations such as fishing and clearing ponds, fish species and adult fish are injured and channels are opened for the invasion of bacteria. Such fish diseases include watery mildew, Rotten gills, red-skin disease, print disease and so on. Early spring species after several months of winter, poor health, a large number of parasites easily active or passive forms of invasion of fish, fish gills infiltration caused by inflammation, gill filarial rot have a whipwormosis, oral filariasis, monospora Disease, small melons and bug disease, carnivore disease and oblique pipe worm disease; invasion of fish body surface and body parasites cause weight loss until the death of anchovy fleas, fish lice disease. In order to improve the economic benefits of fish farming, fish diseases should not be overlooked in early spring