近年来,四川省许多基层鱼场淡水鲳小瓜虫病十分流行,特别是苗种的发病率和死亡率都很高,发病率可高达80％,个别的甚至于100％,死亡率也在30％左右,经一定的防治后死亡率和发病率都大大的下降。 病鱼体色发黑,消瘦,食欲下降、游泳异常;肉眼可见病鱼鳃和鳍条上出现白色小点状囊泡,故又称“白点病”;严重时可见躯干,头部和口腔等处都有小白点分布,有时眼角膜上也有小白点出现;同时还伴有粘液增多,表皮腐烂,脱落等。 淡水鲳小瓜虫病多发生于春、秋季节,如4—6月和9—10月;主要危害淡水鲳的苗种,尤其是越冬后“寸片”多见,成鱼和亲鱼少见。在水温15—20℃时,且池水水质恶劣、放养密度又大的情况下常大批发病,发病率 In recent years, many primary fish farms in Sichuan Province are very popular in recent years. In particular, the incidence and mortality rate of seedlings are very high, with the incidence rate as high as 80%. Some even even have 100% mortality rates About 30%, after a certain degree of prevention and treatment of mortality and morbidity are greatly reduced. Disease fish body color black, weight loss, loss of appetite, abnormal swimming; macroscopically visible disease gills and rays appear white dot vesicles, it is also known as “white spot disease”; severe visible torso, head and mouth There are white spots and other distribution, and sometimes there are white spots on the cornea appear; also accompanied by increased mucus, epidermal decay, shedding and so on. Freshwater tapir cucurbit disease occurred in the spring and autumn seasons, such as April-June and September-October; the main harm to the freshwater tapir seed, especially after winter, “inch” more common, adult fish and broodstock rare. In the water temperature of 15-20 ℃, and poor water quality, stocking density and large cases often large number of incidence, the incidence