肝坏病是目前养殖鱼类中最常见的一种疾病,由于使用受细菌、病毒侵染或脂肪氧化较严重的饲料,具有很大毒性,从而损害鱼类肝组织。它可造成弥漫性脂肪变性影响肝功能。这类变性脂肪往往发生坏死,使肝脏呈黄色或黄褐色。还有投喂受霉菌感染的饲料,如玉米、米糠、花生饼、豆饼等一些容易受潮的物质,产生黄曲霉及亚硝酸基化合物等招致鱼类的肝病;另外,养鱼水体受铜、氨等物质污染引发肝病,或长期使用含呋喃西林、呋喃唑酮等刺激肝脏的饲料添加剂,也易使鱼肝脏发病。其症状主要表现为肝细胞大片坏死;肝静脉阻塞、门脉压增加,以及造成胶体渗透压降低和肝淋巴液等渗透压增加,而导致鱼体蓄积腹水等症状。 Hepatic necrosis is the most common disease in farmed fish and is very toxic to fish liver tissue due to the use of feed contaminated with bacteria, viruses or fat oxidation. It can cause diffuse steatosis affecting liver function. Such degeneration of fat often necrosis, so that the liver was yellow or brown. There are also feed mold infected with feed, such as corn, rice bran, peanut cake, bean cake and some easily damp substances, resulting in Aspergillus flavus and nitrite compounds such as fish caused by liver disease; In addition, the fish body of water by the copper, ammonia Other substances such as liver pollution caused by pollution, or long-term use of nitrofurazone, furazolidone and other feed additives to stimulate the liver, but also easy to fish liver disease. The symptoms mainly manifested as hepatocellular necrosis; hepatic vein occlusion, increased portal pressure, and resulting in decreased colloid osmotic pressure and increased hepatic lymph osmotic pressure, resulting in the accumulation of ascites and other symptoms of fish.