Qualidade microbiológica da água e histopatologia de brânquias de peixes provenientes de pisciculturas do município de itapecuru-mirim, Estado do Maranhão
The present study evaluated the microbiological water quality and tissue lesions in gills from Nile tilapia (Oreochromis niloticus) and hybrid tambacu (Colossoma macropomum female x Piaractus mesopotamicus male). For this, water and gills were collected from fish farming at six locations in Itapecur...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés portugués |
| OAI Identifier: | oai:repositorio.unesp.br:11449/73282 |
| Acceso en línea: | http://dx.doi.org/10.4025/actascibiolsci.v34i2.8460 http://hdl.handle.net/11449/73282 |
| Access Level: | acceso abierto |
| Palabra clave: | Coliforms Gill epithelium Lesions Tambacu Tilapia Water animal tissue bacterial infection bacterium Brazil coliform bacterium Colossoma macropomum controlled study dry season edema epithelium Escherichia coli fish fish disease gill Gram negative bacterium Gram positive bacterium heterotropphic bacterium histopathology hyperplasia inflammation microbial diversity microbiological water quality nonhuman Oreochromis niloticus Piaractus mesopotamicus pisciculture rainy season season species difference telangiectasia tissue structure water analysis water contamination water quality water sampling Posibacteria |
| Sumario: | The present study evaluated the microbiological water quality and tissue lesions in gills from Nile tilapia (Oreochromis niloticus) and hybrid tambacu (Colossoma macropomum female x Piaractus mesopotamicus male). For this, water and gills were collected from fish farming at six locations in Itapecuru- Mirim County, Maranhão State. Microbiological water analyses revealed contamination by total coliforms, Escherichia coli and heterotrophic bacteria. In the gills, we observed a diversity of Gram-positive and Gramnegative bacteria. The tissue lesions were: lamellar fusion, interlamellar hyperplasia, sub-epithelial edema and telangiectasia. Inflammatory lesions were not observed. Significant statistical difference (p > 0.05) was not detected when comparing different gills lesions during rainy and dry season. The correlation between lesion and pond type was statistically different (p < 0.05) for lamellar fusion and interlamellar hyperplasia which occurred more frequently at ground ponds. Regarding the frequency of lesions in the different fish species, there was statistical difference (p < 0.05), and the tambacu was more sensitive to lamellar fusion while tilapia was more sensitive for the other lesions. In relation to the sampling stations, there was statistical difference for all the gill lesions. In conclusion, tissue lesions are nonspecific and function as a defense mechanism against polluted aquatic environments, without infectious character. |
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