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| Pompeu,Paulo dos Santos; Horta,Luiz Felipe Mascarenhas; Martinez,Carlos Barreira. |
| This work aimed to experimentally evaluate the behavior of Brazilian freshwater fish species when submitted to a gradual increase in pressure, as well as sudden decompression's effects simulating the passage through a hydroelectric turbine. Four species from the São Francisco river basin were tested: Astyanax bimaculatus, Hypostomus sp., Leporinus reinhardti and Prochilodus costatus. For all of them mortality rates due to decompression were extremely low. However, the symptoms related to decompression, such as bulged eyes and hemorrhage, were not observed only in Hypostomus sp., and were more frequent the larger the pressure values were, considering the values from which decompression was performed. All these symptoms decreased significantly after 24 h of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Downstream fish passage; Dams; Experimental apparatus; Fish mortality; Pressure effects on fish. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100015 |
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| Felizardo,Viviane de Oliveira; Andrade,Estefânia de Souza; Murgas,Luis David Solis; Winkaler,Elissandra Ulbricht; Wouters,Flademir. |
| Fish damage in hydroelectric stations has been extensively reported, but further investigations focusing on Brazilian migratory species, especially large fish, are needed. The present study describes swimbladder abnormalities in piapara Leporinus obtusidens, a migratory physoclistous species, collected downstream from the Funil Hydroelectric station dam, Minas Gerais, Brazil. The 117 specimens collected were dissected for swimbladder evaluation in the coelomic cavity. The abnormalities detected in 14 of the fish (12%) were swimbladder rupture with exteriorization (N = 12) and formation of sac-like projections (N = 2). The specimens that had swimbladder abnormalities weighed over 1300 g for both sexes. These abnormalities may be caused by bladder... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish mortality; Migratory fish; Pressure changes; Reservoir. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300012 |
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| Maridueña, Ana; Chalén, Norma; Coello, Dialhy; Cajas, Jacqueline; Elías, Esteban; Solís, Pilar; Aguilar, Fernando. |
| En febrero de 2003 en la Laguna de Yahuarcocha, se registró la muerte masiva de peces, estimándose que morían aproximadamente 500 peces/m2 por causas no conocidas. Fenómeno que se mantuvo durante algunas semanas disminuyendo paulatinamente el número de muertes. El Instituto Nacional de Pesca realizó un monitoreo durante los días 19 y 20 de marzo, con la finalidad de determinar las posibles causas, para lo cual se analizaron los parámetros ambientales, biológicos, identificación de las especies presentes en la laguna y la histopatología de los órganos y tejidos de los peces afectados. Los parámetros físico-químicos en la columna de agua y sedimentos registrados se encontraron dentro de los rangos normales para cuerpos lóticos. Desde el punto de vista... |
| Tipo: Journal Contribution |
Palavras-chave: Mortality causes; Pathology; Water quality; Fresh water; Fish diseases; Fish mortality. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4501 |
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