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Parasitological and histopathological diagnosis of a non-native fish (Oreochromis sp.) with a noticeable presence in a natural Brazilian river environment

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Abstract

Nile tilapia is an exotic species produced in Brazilian aquaculture. The aim of this study was to constitute a pathological diagnosis in Oreochromis sp. with a noticeable presence in a river in southern Brazil, and to verify the origin of these fish in this natural habitat, an environment with high sanitary precariousness due to discharges of industrial effluents. A total of 30 fish were collected during three sampling events and their health status was assessed by parasitological fauna survey, parasitological indices and histopathological examination of the gills, liver, spleen and kidney. Five species of monogenea were identified infesting gills and stomach: Cichlidogyrus sclerosus, C. halli, C. thurstonae, Scutogyrus longicornis and Enterogyrus cichlidarum; and 4 species of trichodinidae infesting the body surface and gills: Trichodina magna, T. compacta, T. centrostrigeata and Paratrichodina africana. The results showed differences according to the seasonality of the collection, with higher parasite count and larger tissue alterations in summer. Histopathological analysis fluctuated from moderate to severe, but necrosis prevailed in all organs and in all fish, indicating that these fish did not enjoy full health.

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The data that support the findings of this study are available from the corresponding author on request.

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Acknowledgements

The authors of the National Council for Scientific and Technological Development (CNPq) for a research Grant and Financial Support to M.L. Martins (CNPq 446072/2014-1, 305869/2014-0); Department of Aquaculture of the Federal University and Santa Catarina.

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  1. AQUOS-Aquatic Organisms Health Laboratory, Aquaculture Department, Federal University of Santa Catarina (UFSC), Rod. Admar Gonzaga 1346, Florianopolis, SC, 88040-900, Brazil

    Nicollas Breda Lehmann, Marco Shizuo Owatari, William Eduardo Furtado, Lucas Cardoso, Karen Roberta Tancredo, Gabriel Fernandes Alves Jesus, Gustavo Ruschel Lopes & Mauricio Laterça Martins

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  1. Nicollas Breda Lehmann
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  2. Marco Shizuo Owatari
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NBL and MSO had written the article and sample collection for the study. GFAJ, GRL, WEF and KRT helped in sample screening and parasite identification. LC helped in histological analysis. MLM (advisor) helped in critical review of the article.

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Correspondence to Marco Shizuo Owatari.

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Lehmann, N.B., Owatari, M.S., Furtado, W.E. et al. Parasitological and histopathological diagnosis of a non-native fish (Oreochromis sp.) with a noticeable presence in a natural Brazilian river environment. J Parasit Dis 44, 201–212 (2020). https://doi.org/10.1007/s12639-019-01184-6

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