大多数疾病的发生都有 一定的季节性,多数疾病在 4—10月流行。因此,掌握发 病规律,及时有计划地在疾 病流行前进行药物预防,是 防止疾病的有效措施。 体外疾病的药物预防 1、用中草药捆成小捆, 放在池水中沤,可杀灭水产 养殖动物体外病原体。如乌 桕叶沤水可预防细菌性烂鳃 Most diseases have a certain seasonal occurrence, most of the epidemic in April-October epidemic. Therefore, grasping the law of onset and timely and planned prevention of the drug before the epidemic is an effective measure to prevent the disease. Drug prevention of diseases in vitro 1, bundled with Chinese herbal medicine into small bundles, on the water 沤, can kill aquatic animals in vitro pathogens. Such as black mulberry leaf water can prevent bacterial gills