The helminth community ofGeophagus proximus(Perciformes: Cichlidae) from a tributary of the Paraná River, Ilha Solteira Reservoir, São Paulo State, Brazil

Abstract

<jats:title>Abstract</jats:title><jats:p>This study aimed to evaluate the helminth parasites of<jats:italic>Geophagus proximus</jats:italic>from the São José dos Dourados River, a tributary of Paraná River, Ilha Solteira Reservoir, São Paulo State, Brazil. From May 2006 to May 2007, 116<jats:italic>G. proximus</jats:italic>specimens were examined and seven different taxa of helminth were collected and identified: proteocephalidean plerocercoids (Cestoda); metacercariae of<jats:italic>Austrodiplostomum</jats:italic><jats:italic>compactum, Clinostomum heluans</jats:italic>and<jats:italic>Clinostomum</jats:italic>sp. (Trematoda); and<jats:italic>Raphidascaris</jats:italic>(<jats:italic>Sprentascaris</jats:italic>)<jats:italic>hypostomi</jats:italic>, and larvae of<jats:italic>Raphidascaris</jats:italic>sp. and<jats:italic>Contracaecum</jats:italic>sp. (Nematoda). All parasites presented the typical aggregated pattern of distribution, as well as the presence of a high number of larval stages, an absence of influence of the host sex and seasonality upon community parameters, as well as a correlation between species richness and host body weight. Moreover, with the exception of<jats:italic>A. compactum</jats:italic>metacercariae, all helminths found in this study are reported for the first time in<jats:italic>G. proximus</jats:italic>.</jats:p>

Biomphalaria stramineaandBiomphalaria glabrata(Mollusca: Planorbidae) as New Intermediate Hosts of the Fish EyeflukeAustrodiplostomum compactum(Trematoda: Diplostomidae) in Brazil

“…In Brazil, since the first record of the parasite (Kohn et al, 1995), more than 30 species of fish have been reported to harbor metacercariae of the parasite (Zica et al, 2011 and references therein;Zago et al, 2013). The measurements on the parasites obtained from the eyes of experimentally infected fish in the present study are in accordance with those obtained by Ostrowski de Nu´˜nez (1982), Kohn et al (1995), and the total variation of the species compiled by Zica et al (2011).…”

Digenea of Hoplias intermedius and Hoplias malabaricus (Actinopterygii, Erythrinidae) from upper São Francisco River, Brazil

“…In some studies, those metacercariae showed a higher prevalence rate than the trahiras from the upper São Francisco River (P=60.7% in the Paraná River (SANTOS et al, 2012), and P=57.1% in the mid-Doce River, State of Minas Gerais (BELEI et al, 2013). For the perciforms, the prevalence of metacercariae has been high in some studies, and it was higher than that for cichlids (P=59.8% in C. kelberi) from the São Francisco River (SANTOS-CLAPP & BRASIL-SATO, 2014), (P=65.0% in C. kelberi (=Cichla monoculus) from the Paraná River (MACHADO et al, 2005), P=92.7% and P=58.6% in Geophagus proximus (Castelnau, 1855) from the Tietê River and from the Ilha Solteira Reservoir, both in the State of São Paulo (ZICA et al, 2010;ZAGO et al, 2013), respectively, and P=71.9% and P=60.0% in Satonoperca pappaterra (Haeckel, 1840) from the Paraná and Tietê Rivers (MACHADO et al, 2005;PAES et al, 2010a), respectively). Among the Sciaenidae representatives, the high prevalence rates were even more pronounced in Plagioscion squamosissimus (Heckel, 1840), and they fluctuated between 90% and 100% in the Paraná (MACHADO et al, 2005;KOHN et al, 2011;SANTOS et al, 2012) and Tietê Rivers (PAES et al, 2010b); they were also high in registers from many other Brazilian states.…”

A new species of Raphidascaris (Nematoda: Raphidascarididae) infecting the fish Gymnogeophagus balzanii (Cichlidae) from the Pantanal wetlands, Brazil and a taxonomic update of the subgenera of Raphidascaris based on molecular phylogeny and morphology

“…Currently, Raphidascaris ( Sprentascaris ) includes six species parasitizing freshwater characiforms (Serrasalmidae), perciforms (Cichlidae) and siluriforms (Loricariidae and Pimelodidae) in the Neotropical region (Petter and Cassone, 1984; Ramallo, 2009; Luque et al ., 2011; Melo et al , 2011; Zago et al ., 2013; Ailán-Choke et al , 2017). None of these species have been characterized genetically.…”