食蚊鱼白内障的研究初报

采用定期观察方法,了解食蚊鱼白内障的发生过程以及由此导致的外部形态和行为的变化情况。研究的食蚊鱼群体的白内障有较高的发生率,白内障鱼一般体色晦暗,经常浮于水面缓慢游动;其摄食和生长也受较大影响。食蚊鱼白内障大多是双眼同时发生的,眼球可见不同程度的浑浊。从外观形态区分,食蚊鱼白内障主要有两种类型,一种是绕核性白内障,另一种无法看到晶状体形状,表现为整个眼球的不透明。对病鱼的眼球等进行组织病理观察,发现病理变化部位主要在晶体,所有病例的晶状体纤维都出现病理变化,最普遍的是晶状体皮质区纤维不同程度变性或断裂;晶状体上皮细胞有脱落、增生等。食蚊鱼白内障为鱼类白内障研究提供良好材料。

Preliminary study on cataract in Mosquito fish

The cataract development and its influence on the living of mosquito fish Gambusia affinis were explored in this studies.The external shape and behavior changed of mosquito fish were noticed,and the opaque in the eyes were closely monitored.Preliminary investigation found that the incidence of cataract in some groups reached 70%.The cataractous fish would often be seen near the surface of the water,and later became dark and thin.Cataract in fish can cause vision impaired and even blindness,may reduce food intake and growth rate.The cataracts were bilateral,and various grade opaque were found in fish eyes.The mostly cataracts were pernuclear cataract and "swollen cloudy lens" cataract.The eyeballs were fixed in different stage and the hispathological changes were observed with light microscope.The pathological changed were found in the lens,the cortical fibres were denaturalizated,in seriously affected lens the fibre resulted in disruption.The epithelial cells were often disrupted,and in some cases the hyperplasia cells were observed.The mosquito fish were susceptible models for fish cataractous research.