Dezfuli B S
Dipartimento di Biologia Evolutiva, Università di Ferrara, Italy.
Parassitologia. 1992 Dec;34(1-3):71-82.
The sheatfish, Silurus glanis (L.), from the terminal part of River Po was examined for the presence of helminth parasites. Of 182 S. glanis specimens, 95 (52.2%) were infected with the acanthocephalan Pomphorhynchus laevis. Mid-gut followed by fore-gut appeared to be the most infected portions of host alimentary canal. In 45 sheatfish of total length < or = 40 cm, specimens of P. laevis were found encapsulated in mesenteric and peritoneal tissues. A comparison between light and electron microscopy on features and stages of testis development in both encapsulated male P. laevis and intestinal male parasites showed that the encysted acanthocephalans were immature; mature spermatozoa were rarely found within the testis of worms from the alimentary canal. Among extraintestinal P. laevis specimens, the presumable eversion of parasite praesoma was observed and described. The results of the present survey suggest that small-size individuals of S. glanis could be used as paratenic host by P. laevis during its life cycle in the study area.
对来自波河末端的六须鲶鱼（Silurus glanis (L.)）进行了寄生虫检查。在182条六须鲶鱼样本中，有95条（52.2%）感染了棘头虫Pomphorhynchus laevis。中肠其次是前肠似乎是宿主消化道中感染最严重的部分。在45条全长小于或等于40厘米的六须鲶鱼中，发现Pomphorhynchus laevis的样本被包裹在肠系膜和腹膜组织中。对包囊内雄性Pomphorhynchus laevis和肠道内雄性寄生虫的睾丸发育特征和阶段进行的光学显微镜和电子显微镜比较显示，包囊内的棘头虫未成熟；在来自消化道的虫体睾丸内很少发现成熟精子。在肠外Pomphorhynchus laevis样本中，观察并描述了寄生虫前端可能的外翻。本次调查结果表明，在研究区域，小型六须鲶鱼个体可能是Pomphorhynchus laevis生命周期中的转续宿主。
