Data/hora: 13/06/2024 04:15:55

Provedor de dados: | 52
País: | Brazil
Título: | Evaluation of the effects of pressure gradients on four Brazilian freshwater fish species
Autores: | Pompeu,Paulo dos Santos; Horta,Luiz Felipe Mascarenhas; Martinez,Carlos Barreira.
Data: | 2009-02-01
Ano: | 2009
Palavras-chave: | Downstream fish passage; Dams; Experimental apparatus; Fish mortality; Pressure effects on fish.
Resumo: | 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 observation. With the increase in pressure inside the apparatus, the four tested species moved towards the upper levels. This behavior could make possoble the implementation of bypass downstream fish passages in dams constructed in Brazil.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100015
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132009000100015
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.52 n.1 2009
Fonte: | info:eu-repo/semantics/openAccess