Endoparasite fauna of freshwater fish from the upper Juruá River in the Western Amazon, Brazil

Abstract

The Amazon region may present a high diversity of endoparasites with a high degree of endemism. In this sense, this study describes the endoparasite fauna in freshwater fish from the Upper Juruá, in the Western Amazon. The study was carried out around the municipalities of Cruzeiro do Sul, state of Acre, and Guajará, state of Amazonas, Brazil. Fish were caught between periods of droughts and floods, using passive and active sampling methods. In the laboratory, specimens were biometrically analysed and necropsied. As a result, a total of 23,740 endoparasites were recorded, belonging to 62 species, with 91 new host reports and 91 new occurrences for the Western Amazon. Nematoda and Digenea were the most diverse and abundant groups, and the increase in host fish richness and diversity influenced the diversity and richness of endoparasites in the environments. In this sense, the present study expands the number of new reports, and contributes data on the distribution and richness of endoparasites for South America.

A Rare Fish Amphistome Revisited: The Phylogenetic Position of Kalitrema kalitrema (Trematoda: Cladorchiidae) Found in Hypostomus spp. (Siluriformes: Loricariidae) from Brazil

“…Kalitrema kalitrema is documented for the first time in H. francisci and H. alatus, indicating a stenoxenous specificity, meaning it can be restricted to congeners. On the other hand, the recent report of the species in Loricaria cataphracta L. from Amazonia during an ecological study [34] indicates that this fish amphistome could infect other loricariid genera. However, a detailed morphological characterization and molecular comparison with the data presented here are necessary to confirm this hypothesis.…”

Metazoan parasite fauna of detritivorous and omnivorous fishes from Amapá Lake, in western Brazilian Amazon

“…2018, Negreiros et al 2018, Negreiros et al 2019, Neves et al 2021, Virgilio et al 2021). These parasites, particularly endohelminths, have life cycles that involve transmission through a trophic web of intermediate, paratenic and definitive hosts (Karling et al 2013;Baia et al, 2018, Neves et al 2021, Virgilio et al 2021, Virgilio et al 2022). Hence, endohelminths can provide information regarding trophic interactions because their complex life cycle requires multiple hosts.…”

Primer registro de Procamallanus (Spirocamallanus) inopinatus travassos, Artigas & Pereira, 1928 y contracaecum sp. Para Auchenipterus nuchalis (Spix & Agassiz 1829) (Siluriformes: Auchenipteridae) en la Amazonía

“…Segundo Reis et al (2016), a diversidade de peixes presentes nos ecossistemas aquáticos amazônicos, chegou a 2.411 espécies. Essa grande diversidade de peixes representa um alto número de potenciais hospedeiros para helmintos parasitos, dessa forma, identifi car novas espécies de helmintos parasitos, pode permitir o monitoramento da riqueza de vertebrados em um determinado habitat (Malta, 1984;Brooks & Hoberg, 2000;Malta & Varella, 2006;Luque & Poulin, 2008;Luque et al, 2017;Poulin, 2020;Virgilio et al, 2021Virgilio et al, , 2022.…”