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首页> 外文期刊>Parasitology >Trichodina heterodentata (Ciliophora) infestation on Prochilodus lineatus larvae: a host-parasite relationship study
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Trichodina heterodentata (Ciliophora) infestation on Prochilodus lineatus larvae: a host-parasite relationship study

机译：线虫Prochilodus lineatus幼虫上的线虫Trichodina heterodentata（Ciliophora）感染：宿主-寄生虫关系研究

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摘要

Prochilodus lineatus is a freshwater fish species found in South America. It is common in aquaculture, but few studies regarding diseases of this fish have been performed. This study presents data of the occurrence of Trichodina heterodentata Duncan, 1977, as well as the pathological alterations detected by light and scanning electron microscopy (SEM). Twenty 20-day-old larvae were harvested from an earth pond and examined. Larvae showed erratic swimming on the pond edges and some had a whitish tegument. Larval smears were either impregnated with silver nitrate or stained with Giemsa stain to observe the taxonomic features of the ciliates. Five larvae were fixed in formalin solution for histopathological analysis, and another five specimens were fixed in glutaraldehyde for SEM. All larvae were diagnosed with a severe infestation by trichodinid T. heterodentata. Histological sections showed discrete hyperplasia of the gill filaments with subepithelial oedema of the secondary lamellae. In the SEM, suction areas were observed on the skin, gill and eye; corrosion and ulceration of the fins were associated with the bacterial presence of cocci on the lesions. This is the first report of T. heterodentata in P. lineatus that is responsible for an acute disease that culminates in larval mortality.
机译：Prochilodus lineatus是在南美发现的一种淡水鱼类。它在水产养殖中很常见，但是很少有关于这种鱼疾病的研究。这项研究提供了Trichodina heterodentata Duncan，1977年的发生数据，以及通过光学和扫描电子显微镜（SEM）检测到的病理变化。从一个土池中收获了二十只20天大的幼虫并进行了检查。幼虫在池塘边缘游动不规律，有的被发白。幼虫涂片用硝酸银浸渍或用吉姆萨染料染色以观察纤毛虫的分类学特征。将五个幼虫固定在福尔马林溶液中进行组织病理学分析，另外五个标本固定在戊二醛中进行SEM。所有的幼虫均被异花毛线虫诊断为严重侵染。组织学切片显示g丝离散增生，继发性片状上皮下水肿。在SEM中，在皮肤，g和眼睛上观察到抽吸区域;鳍的腐蚀和溃疡与病菌中球菌的存在有关。这是P. lineatus中的T. heterodentata的第一个报告，该报告导致了最终导致幼虫死亡的急性疾病。

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