Abstract
Traira (Hoplias malabaricus) is a neotropical fish that is widely distributed in freshwater environments in South America. In the present study, we documented the occurrence of metacercariae of Austrodiplostomum spp. (Diplostomidae) in the eyes and cranial cavity of H. malabaricus and described parasite-induced behavioral changes in the host. The fish were collected from the upper São Francisco River, in the Serra da Canastra mountain range, Minas Gerais, transported alive to the laboratory, observed for 2 weeks, and subsequently examined for parasites. Of the 35 fish examined, 28 (80 %) had free metacercariae in the vitreous humor (mean intensity = 95.4; mean abundance = 76.3), and 24 (68.57 %) had free metacercariae in the cranial cavity, mainly concentrated below the floor of the brain, at the height of the ophthalmic lobe (mean intensity = 12.91; mean abundance = 8.85). Specimens of H. malabaricus with a high intensity of infection in the brain displayed changes in swimming behavior.
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Acknowledgments
The authors would like to thank laboratory technicians Ricardo Afonso Torres de Oliveira and Arlindo Donizette Lançone of ICMBio, and Prof. Dr. Arício Xavier Linhares for statistical analysis. Lincoln L. Corrêa would like to thank CAPES/Procad-NF 69/2010-UNICAMP for financial support.
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Corrêa, L.L., Souza, G.T.R., Takemoto, R.M. et al. Behavioral changes caused by Austrodiplostomum spp. in Hoplias malabaricus from the São Francisco River, Brazil. Parasitol Res 113, 499–503 (2014). https://doi.org/10.1007/s00436-013-3679-6
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DOI: https://doi.org/10.1007/s00436-013-3679-6