Influence of host sex and age on infracommunities of metazoan parasites ofProchilodus lineatus(Valenciennes, 1836) (Prochilodontidae) of the Upper Paraná River floodplain, Brazil

Abstract

Summary :149 specimens of Prochilodus lineatus were collected on the upper Paraná River floodplain. Of these, 121 (82.1 %) were parasitized. 33 species of metazoan parasites were recorded. Rhinonastes pseudocapsaloideum was classified as secondary, while all other species were classified as satellites. Ergasilus sp. and Tereancistrum curimba were positively associated and their abundances were positively correlated. Saccocoelioides magnorchis and S. nanii were positively associated and their abundances were positively correlated. The mean diversity in the infracommunities of P. lineatus was H = 0.6875 ± 0.4398. Host standard length was not correlated with parasite diversity (rs = 0.1726; p = 0.0533). The abundances of T. curimba and Kritskyia boegeri, and S. magnorchis and S. nanii were significantly correlated with host length. Correlation between fish age and parasite prevalence was not significant. The abundances of Amplexibranchius sp., K. boegeri and S. magnorchis were significantly different among host age classes. For Amplexibranchius sp., the three-year old age class had more parasites. For K. boegeri, the intermediate age classes had the most numerous parasites. Only Tereancistrum curimba showed significant difference in the prevalence between the sexes, with females being more parasitized. Studies about this species have broached prominent aspects of population structure and biology (e.g. Terraes et al., 1999;Lizama, 2000; Ranzani Paiva et al., 2000). Important information about the parasitic fauna of this host has recently been reported. Takemoto et al. (2002) described a new species of monogenean parasite of the urinary bladder, Domingues et al. (2002) described a new species of monogenean parasite of the nasal cavity and Lizama et al. (2004) described two species of gill monogeneans. As regards parasite ecology, Martins et al. (2001), referred only to seasonal variation in parasitism levels of the acanthocephalan Neoechinorhynchus curemai. The object of this study was to evaluate the relationships between the host Prochilodus lineatus and the metazoan parasite fauna, including the influence of host sex and length/age on parasite infrapopulations. Résumé : INFLUENCE DU SEXE ET DE L'ÂGE DE L'HÔTE SUR LES INFRACOMMUNAUTÉS DE MÉTAZOAIRES PARASITES

Gill parasites of Prochilodus lineatus(Valenciennes, 1836) (Pisces; Curimatidae; Prochilodontinae) in the Middle Paraná System (Argentina)

“…The values for T. toksonum and T. curimba were notably lower (5.3 and 22.8% respectively) than in the present study (Table 2) 2004, 2005.…”

“…A significant association was found (Fisher p= 0.0405) between T. curimba and Dactylogryridae specimens, without association with Ergasilidae copepods. This situation had previously been recorded in the alluvial valley of the Upper Paraná River, in Brazil 2004, 2005.…”

Sexual and age characteristics of the parasitofauna of Abramis brama (Cypriniformes, Cyprinidae) of the Lower Irtysh (Russia)

“…This species has distributed itself practically throughout the Ob, Irtysh and many of their tributaries, and also the basin of the Yenisei (Kuderskij, 2001;Popov, 2010). Recently, the interest of scientists to determining presence of dependence between the infestation with different species of parasites and the sex and age of the host has increased (Lizama et al, 2006;Tadiri et al, 2016). The age structure and sex of fish have an effect on change in distribution of parasites in ichthyocenoses, where differences in preferences in feeding and living indicate non-uniformity of trophic behaviour, which significantly contributes to the usually observed aggregation of helminths in hosts in natural conditions (Duneau & Ebert, 2012;Hayatbakhsh et al, 2014;Tadiri et al, 2016).…”

A new species of Anacanthoroides and redescription of Apedunculata discoidea (Monogenoidea) parasitizing Prochilodus argenteus (Actinopterygii) from the São Francisco River, Brazil

“…cit. ) Lizama et al (2005) recorded Gyrodactylus sp. in the nasal cavity, K. boegeri in the urinary bladder, and T. curimba, T. toksonum, Tereancistrum sp., Anacanthoroides sp., R. pseudocapsaloideum and an undetermined Ancyrocephalidae species in the gills of P. lineatus from the Paraná River basin.…”