常见鱼病的肉眼诊断养鱼者应学会诊断鱼病，在没有显微镜的情况下，可根据鱼体外表的病状和鱼在水体中的活动情况进行肉眼诊断。１．出血病：病毒性疾病。病鱼的鳃盖、鳍基部、头顶等部位出血。剥开备皮可见骨肉发红充血。２．肠炎病：细菌性疾病。病鱼腹部膨大，肛门红肿... Macroscopic diagnosis of common fish diseases Fish farmers should learn to diagnose fish diseases and, in the absence of a microscope, may make a visual diagnosis based on the appearance of the fish and the activity of the fish in the water. 1. Hemorrhagic disease: a viral disease. Diseased fish gill cover, fin base, head and other parts of the bleeding. Peeling the skin visible red flesh congestion. 2. Enteritis disease: bacterial disease. Diseased fish abdominal swelling, anal swelling ...