感染小瓜虫草鱼幼鱼组织病理学变化

摘要

Histopathological changes were observed in brain ,heart ,gill ,fin ,head kidney ,midkidney , premaxilla ,skin and viscus in juvenile grass carp Ctenopharyngodon idellus infected with protozoon Ichthyophthirius sp .The protozoon was found in various organs included gill filaments ,premaxilla , pectoral fins and dorsal fins ,and there was congestion in the brain ,and the auricle ,ventricule and arterial balls of the heart .There was congestion in the gill filaments with inflammatory cells infiltration ,the disappeared partly gill lamella structure ,and respiratory epithelial cells .The congestion in the head kidney , the fatty degeneration and hyalinization of epithelial cells of renal tubuls and the connecting tubule ,and enlargement of glomerula led to the disappearance of renal follicle ,with congestion in renal interstitium . The collagen fiber of dense layer in abdominal subcutaneous tissue showed part hyaline degeneration ,the congestion vein ,the intestinal mucous epithelial cell shed partly ,and the almost dissolved epithelial cells . The serious congestion was observed in the hepatopancreas ,and venous congestion appeared in the liver sinusoids and spleen .%应用组织病理学方法，对感染小瓜虫草鱼幼鱼的脑、心脏、鳃、鳍、头肾、中肾、上颌、皮肤肌肉及内脏团等组织器官进行观察。观察结果表明，各组织器官均有明显的组织病理学变化，鳃丝、上颌、胸鳍及背鳍等组织器官可见小瓜虫寄生；脑组织淤血；心耳、心室及动脉球内发生淤血；鳃丝淤血并有炎细胞浸润，部分鳃小片结构消失，呼吸上皮细胞脱落；头肾淤血；中肾肾小管、连接小管的上皮细胞内出现脂肪样变及玻璃样变，肾小球肿大导致肾小囊囊腔消失，肾间质淤血；腹皮下致密层胶原纤维发生玻璃样变，静脉淤血；肠道黏膜层部分上皮细胞脱落，严重者上皮细胞溶解消失，黏膜下层可见炎细胞浸润；肝胰脏内肝血窦、静脉淤血，肝脏局灶性坏死；脾脏内静脉淤血。