Abstract
Eighty-one Hoplias malabaricus specimens were collected between February 2014 and June 2016. A total of 29 species of metazoan parasites were found, 13 of which were identified as monogeneans, seven were digenean species, seven of which were nematodes, and two of which were from the subclass Hirudinea. The highest prevalence values were presented by Contracaecum sp. and Tylodelphys sp. The highest mean abundance and mean intensity was recorded by Tylodelphys sp.; the values were 36.7 ± 61.8 and 55.65 ± 69.1, respectively. The abundance of the monogenean Urocleidoides cuiabai was found to be positively correlated with host weight. The abundance of Bucephalidae gen. sp. exhibited significant positive correlations with host weight and length. For Contracaecum sp., a significant negative correlation was found between its abundance and host length and weight. No significant differences between the diversity indexes (Margalef, Pielou and Shannon) of the parasites collected in the two points were found. The Sorensen similarity index, with a value of 0.82 between the two sampling points revealed that the parasitic diversity between them is similar. The findings from this study represent new records of occurrence of H. malabaricus, as well as of Urocleidoides margolisi, Scleroductus sp. and Helobdella sp.
Highlights
Studies involving vertebrates in the Neotropical region have been carried out during the last four centuries (Rull 2011)
Fish samples were collected from two sampling points along the Batalha River: the main channel, located in the city of Reginópolis, São Paulo; and the reservoir managed by the Departamento de Água e Esgoto (DAE) of the city of Bauru and located in the town of Piratininga, São Paulo
Data on standard length, weight (g), and sex were recorded. These collections followed the guidelines for scientific fish licensing and were authorized by the Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) through the Sistema de Autorização e Informação da Biodiversidade (SISBIO) under case number 40998-3
Summary
Studies involving vertebrates in the Neotropical region have been carried out during the last four centuries (Rull 2011). Considering the lack of studies on invertebrates, especially the parasite communities, several authors supported research on the systematics and diversity of this group (Poulin & Morand 2004). The Tietê River and some of its tributaries, such as the Batalha River, from the TietêBatalha drainage basin, located in the state of São Paulo, Brazil. This basin possesses a drainage area of 3,149 km, and the Batalha River is 167 km in length, making it one of the most important tributaries of the Tietê River (Silva et al 2009).
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