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1.脂肪肝病症状及病理变化 患病鱼类无明显的体表症状,仅有食欲不振、生长缓慢、饲料报酬低等不易察觉的现象,死亡很少,但病程长,累积死亡率较高。病理解剖见肝脏表面有脂肪组织块积累,或肠管表面脂肪覆盖明显。肝组织脂肪变性明显,组织空泡化,细胞体积增大,肝组织淤血。 2.病因 (1)饲料中蛋白质、脂肪、糖类等主要成分的不足或过多;饲料的主料配方与养殖对象的营养标准匹配不合适。
1. Symptoms and pathological changes of fatty liver disease There is no obvious body surface symptoms of fish, only the phenomenon of poor appetite, slow growth, low feed remuneration and other imperceptible phenomena, with few deaths but long duration and high cumulative mortality. Pathological anatomy see the liver surface accumulation of fatty tissue mass, or intestinal fat surface covered significantly. Steatosis of liver tissue is obvious, tissue vacuolization, cell volume increase, liver tissue congestion. 2. Etiology (1) feed protein, fat, sugar and other major components of the deficiencies or too much; feed ingredients formula and breeding target nutrition standards match is not appropriate.