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一、晕头病:发病初期病鱼停食、体色发黑、群集池角。严重时在水中窜游,急剧挣扎或旋转狂游后下沉池底死亡。该病易见于体长4厘米之前的当年鱼苗,流行季节为3—7月份,4—5月大流行。防治方法:①对设施和工具进行严格消毒。少投喂鲜活饵料,如须投喂要先消毒。②换水时,注水速度不可太急,水温差不得大于±2℃,每次换水后要及时泼洒0.4—1克/立方米呋喃唑酮,或者用生石灰上清液泼洒,使池水 pH 值在7—8。二、肠炎病:腹部膨大,有红斑、肛门外突
First, dizziness: the disease early disease fish stop eating, body color black, cluster pool corner. Seriously channeling in the water, a sharp struggle or rotation after the sinking sunk death. The disease is easily seen in the body length of 4 cm before the fry, the popular season for March-July, April-May pandemic. Prevention methods: ① strict disinfection of facilities and tools. Less fed fresh feed, such as must first fed to disinfect. ② water change, the water injection speed can not be too hasty, the water temperature difference of not more than ± 2 ℃, after each change of water should be promptly spilled 0.4-1 g / m3 furazolidone, or with quicklime supernatant spill, so that the water pH value of 7 -8. Second, enteritis disease: abdominal swelling, erythema, anus outside the sudden