Monogeneans (Dactylogyridae) parasitizing gills of Salminus hilarii from a Neotropical reservoir, Brazil

With the aim of creating an inventory of the metazoan gill parasites of Salminus hilarii in the Taquari River, state of São Paulo, Brazil, five species of monogeneans (Anacanthorus contortus, A. bicuspidatus, Annulotrematoides parisellei, Jainus iocensis and Tereancistrum arcuatus) are reported the first time for this host. A total of 28 fish were sampled quarterly between April 2011 and January 2012, with 10 hosts in a lentic ecosystem and 18 in a lotic ecosystem. Quantitative ecological descriptors (prevalence, intensity of infestation and abundance) were calculated for the purpose to comparing the two ecosystems sampled (lentic and lotic ecosystems). However, no quantitative difference between the lentic and lotic ecosystems was observed. The present study has made available a checklist for species of the genus Anacanthorus and their hosts and geographical distribution in the Neotropical region up to the present time.

本研究以巴西圣保罗州塔夸里河（Taquari River）流域希氏大鳍脂鲤（Salminus hilarii）的后生动物鳃寄生虫（metazoan gill parasites）名录构建为目标，首次在该宿主中报道了5种单殖吸虫（monogeneans）：Anacanthorus contortus、A. bicuspidatus、Annulotrematoides parisellei、Jainus iocensis及Tereancistrum arcuatus。本研究于2011年4月至2012年1月间按季度采样，共收集28尾宿主鱼，其中10尾采自静水生态系统（lentic ecosystem），18尾采自流水生态系统（lotic ecosystem）。为对比两处采样生态系统的寄生虫群落特征，本研究计算了感染率（prevalence）、感染强度（intensity of infestation）与感染丰度（abundance）三类生态定量指标。然而研究结果显示，静水与流水生态系统间未呈现显著的定量差异。本研究同时整理得到了截至当前新热带区（Neotropical region）Anacanthorus属物种、其宿主及地理分布的完整物种名录。