Qualitative and quantitative study of parasites of Pimelodus maculatus and Rhamdia quelen from the Jacaré-Pepira River, state of São Paulo, Brazil

Negrelli, Débora Caroline; Iannacone, José; Abdallah, Vanessa Doro; Azevedo, Rodney Kozlowiski de

doi:10.1590/0001-3765202120190571

Cited by 3 publications

(2 citation statements)

References 53 publications

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“…The reason for such abundance remains unclear due to the scarcity of studies regarding the parasite biology. Even so, this parasite species was already found infecting Silver catfish from the Gandu River, Rio de Janeiro (Azevedo et al, 2010), also showing aggregate distribution (Negrelli et al, 2021).…”

Section: Discussionmentioning

confidence: 98%

Fish parasites from a neotropical tidal river within a biodiversity hotspot

Moraes,

Costa,

Takemoto

et al. 2024

Acta Limnol. Bras.

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Aim We investigated the ichthyofauna parasite component community across a gradient of anthropogenic pressures of the Guaraguaçu River, south Brazil, a Neotropical river of central importance for biodiversity conservation. Methods After fish sampling, all fish were identified, measured, weighed and eviscerated. The viscera and gills were inspected for parasite screening and subsequent identification. Parasite diversity estimators were calculated for the most abundant host species. Results A total of 159 host specimens from 12 species were examined, being 140 (88.05%) found to be infected with at least one parasite, including 14 new parasite occurrences. The most widely distributed parasite was the nematode Contracaecum sp., found in 8 host species. The highest mean infection intensity and mean abundance was observed for the monogenean Aphanoblastella mastigatus, infecting the Silver catfish Rhamdia quelen. The Shannon-Wiener, Jost and Simpson indexes were higher for the more abundant fishes, except for the Trahira Hoplias malabaricus. Most host species harbored parasites in poorly aggregated distribution, according to the discrepancy index. The Berger-Parker index showed monogenean dominance in all hosts except for H. malabaricus. We found little evidence for parasite infracommunity changes across the gradient of the river. Conclusions We described the infection patterns in an important Neotropical river. The new parasite occurrences highlight the contribution of our study. Fish-parasite interactions changed throughout the river stretches, and we argue that it does not necessarily means changes in diversity and abundance of parasite within species, but the rearrange of interactions. Moreover, it seems that parasites are more abundant in most impacted sites, another reason to continue the monitoring.

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Section: Discussionmentioning

confidence: 98%

Fish parasites from a neotropical tidal river within a biodiversity hotspot

Moraes,

Costa,

Takemoto

et al. 2024

Acta Limnol. Bras.

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“…The following alpha diversity indices were determined: Richness (S), Individuals, Menhinick (D Mn ), Margalef (D Mg ), Shannon-Weaver (H`), Pielou Equitability (J`), Simpson (D), Berger-Parker (d) and finally Chao-1 for the parasitic community component, for males and females (Salmerón-López et al, 2017;Minaya et al, 2021a;Negrelli et al, 2021). Similarly, to compare the values of H and D between sexes, the Student's t test was used.…”

Section: Data Processing and Statistical Analysismentioning

confidence: 99%

Ectoparasitic community of the gills of Pacific sierra Scomberomorus sierra Jordan & Starks, 1895 (Actinopteri: Scombridae) from northern Peru

Ferré-Alcántara,

Minaya,

Alvariño

et al. 2023

MACN

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Scombrids have mainly been studied for systematic, zoogeographic and parasitological purposes; however, there are few studies focused on the interaction between ecological parameters and the parasite community of a given host. Therefore, the objective of this research was to analyze the ectoparasite community of Scomberomorus from Northern Peru. A total of 58 specimens of S. sierra were obtained and were necropsied to search for parasites, which were collected and preserved. The main parasitological indices, degree of aggregation, parasite association with size, weight and sex, and finally, the alpha diversity indices of these parasitic fauna were calculated. 98% of the fish were parasitized by at least one parasitic species. The parasites with the highest prevalence were Didymocylindrus sp. (Trematoda) and Thoracocotyle crocea (Monogenea), while the parasite with the highest average intensity was Caligus pelamydis (Copepoda). The mean intensity and abundance of infection of T. crocea and unidentified Didymozoidae. were found to be positively related to the size of S. sierra. Sex showed significant differences only with the mean abundance of T. crocea, and with the mean intensity of Didymocylindrus sp. The five new records of parasites in S. sierra from Peru were Didymocylindrus sp., Glomeritrema sp., unidentified Didymozoidae, Scomberocotyle scomberomori, and C. pelamydis. This study represents the first ecologicalparasitic record for S. sierra in northern Peru.

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