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一、水霉病 水霉病在乌鳢生长发育的各个阶段都会发生。 1.病鱼症状 患病乌鳢鱼体消瘦，摄食能力降低，厌食，发病初期，症状不明显，仅体表局部有一些灰白色。以后，随着病原体的蔓延，体表出现点状血斑。病灶部位黑色素消褪，出现灰白色区域。鱼体失去光泽，离群?
First, the water mold mildew in all stages of development and development of black beans will happen. 1. Symptoms of sick fish Mackerel fish body weight loss, reduced feeding capacity, anorexia, early onset, the symptoms are not obvious, only the body surface some gray. Later, with the spread of pathogens, spot-like spot on the body surface. Melanoma lesions fade, gray areas appear. Fish loses its luster and lifts?