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Year 2018 - Volume 38, Number 6
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Infection of the gills of Nile tilapia (Oreochromis niloticus) by Myxosporea, 38(6):1085-1090
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ABSTRACT.- Teixeira R.J., Eiras J.C., Spadacci-Morena D.D., Xavier J.G. & Lallo M.A. 2018. [Infection of the gills of Nile tilapia (Oreochromis niloticus) by Myxosporea.] Infecção das brânquias de tilápia do Nilo (Oreochromis niloticus) por Myxosporea. Pesquisa Veterinária Brasileira 38(6):1085-1090. Programa de Patologia Ambiental e Experimental, Universidade Paulista, Rua Dr. Bacelar 1212, 4º andar, São Paulo, SP 04026002, Brazil. E-mail: anetelallo@hotmail.com
In this study, 85 Nile tilapia (Oreochromis niloticus Linnaeus, 1758) were collected in recreational fishing lake (n=35) and Lake Ibirapuera Park (n=50), both located in the city of São Paulo. After euthanasia, the fish gills were examined fresh and after histological techniques for the presence of myxosporea. Myxosporeans were observed only in recreational fishing lake with a prevalence of 45.7% (16/35). Henneguya sp. (11.4%, 4/35) and Myxobolus sp. (34.3%, 12/35) were myxosporeans observed in this study. Spores of Henneguya sp. were found in smears fresh gills. The plasmodium of Myxobolus found was of the types epithelial (75%, 9/12), vascular (16.2%, 2/12), and muscle, muscle located in the gills (0.8%; 1/12). The presence of myxosporea was related to epithelial hyperplasia, fusion of lamellae, hyperplasia of mucous cells, inflammation and other pathological changes. Thus it is concluded that prevalence of Myxobolus sp. and Henneguya sp. in gills of O. niloticus was high and was associated with significant histopathological lesions, which highlights the importance of these protozoa to fish cultures. |
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