Fishes of the order Siluriformes, known as catfishes, have a global distribution with more than 3,600 valid species of which 2,087 occur in the Neotropical region. Despite being highly diverse, abundant, and of economic importance as food and ornamental fishes, knowledge about the diversity and distribution of their helminth parasites is fragmentary and scarce. Eight species of catfishes (Pterodoras granulosus, Trachydoras paraguayensis, Pimelodella avanhandavae, Loricariichthys platymetopon, Pterygoplichthys ambrosettii, Rhinelepis aspera, Hemisorubim platyrhynchos, and Sorubim lima) from the Aguapeí River, Upper Paraná River basin, municipality of Castilho, São Paulo State, Brazil, were surveyed for helminth parasites. Collected fishes were weighed, measured, and examined for helminth parasites following standard methodology. Fifty helminth parasite taxa (23 monogeneans, 13 digeneans, 11 nematodes, and three cestodes) were found from a total of 405 fishes screened. The helminth taxon that showed the highest mean intensity of infection and mean abundance was the nematode Rondonia rondoni from P. granulosus, followed by the nematode Parasynodontisia petterae from R. aspera. The ecological analyses were carried out at the component community level and at the infracommunity level. Trachydoras paraguayensis had the richest helminth component community. Pterygoplichthys ambrosettii had the most diverse helminth component community and R. aspera had the lowest. Both hosts are loricariids and have similar diet. However, the high parasite diversity of P. ambrosettii is due to the number of dactylogyrids species found (10), which are directly transmitted, whereas only three dactylogyrid species were found in R. aspera. At infracommunity level, the nematode species R. rondoni and P. petterae dominated the parasite communities. This study presents 38 new host records, contributing considerably to increase the diffuse knowledge of helminth parasites of Neotropical siluriforms.

中文翻译：

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巴西圣保罗州巴拉那盆地上游阿瓜佩伊河八种鲶鱼寄生虫的多样性。


鲶形目鱼类，又称鲶鱼，在全球分布，有超过 3,600 种有效物种，其中 2,087 种出现在新热带地区。尽管作为食用鱼和观赏鱼具有高度多样性、丰富性和经济重要性，但关于其寄生虫的多样性和分布的知识却是零碎和稀缺的。来自巴西圣保罗州卡斯蒂略市巴拉那河流域上游阿瓜佩伊河的 8 种鲶鱼（Pterodoras Philliposus、Trachydoras paraguayensis、Pimelodella avanhandavae、Loricariichthys platymetopon、Pterygoplichthys ambrosettii、Rhinelepis aspera、Hemisorubim platyrhynchos 和 Sorubim lima），进行了蠕虫寄生虫调查。按照标准方法对收集的鱼进行称重、测量和检查蠕虫寄生虫。从总共 405 条筛选的鱼类中发现了 50 种蠕虫寄生虫类群（23 种单殖纲、13 种双殖纲、11 种线虫和 3 种绦虫）。显示出最高平均感染强度和平均丰度的蠕虫分类单元是来自细粒细粒线虫的 Rondonia rondoni 线虫，其次是来自 R. aspera 的线虫 Parasynodontisia petterae。生态分析是在组成群落层面和群落下层面进行的。巴拉圭粗毛虫拥有最丰富的蠕虫成分群落。 Pterygoplichthys ambrosettii 的蠕虫成分群落最多样化，R. aspera 的蠕虫成分群落最低。两个宿主都是菱蝽科动物并且有相似的饮食。然而，P. ambrosettii 的高寄生虫多样性是由于发现了直接传播的指环虫物种数量 (10)，而在 R. aspera 中仅发现了 3 个指环虫物种。在群落下水平，线虫物种 R. rondoni 和 P. petterae 在寄生虫群落中占主导地位。这项研究提出了 38 个新的宿主记录，极大地促进了对新热带鲶形目蠕虫寄生虫的广泛了解。