Toxicidade do cobre sobre tambaqui Colossoma macropomum (Cuvier, 1818) em pH 4 e pH 8

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The aim of this study was to determine the copper toxicity for the fish species Colossoma macropomum (tambaqui) in pH 4 and pH 8, to assess the bioconcentration and the exposition effects on hematological, ionic parameters and swimming performance of the animals. For this, the lethal concentration in 96 hours (LC50) of copper in pH 4 was estimated in 2,68mg/L of Cu+2. It was not possible to find the LC50 to copper in pH 8 because there was no mortality in none of the experimented concentrations. After this phase, the animals were exposed to sublethal concentrations of this metal plus dissolved organic carbon (DOC) for 96 hours. Tambaqui exposure to these concentrations resulted in disturbs in hematological, ionic parameters, plasma metabolites and genotoxic alterations. However, the exposure does not cause changes in the activity of GST and CAT. An increase of copper levels in gills and liver was observed in exposed animals. So, copper had mild toxicity in pH 4 and no lethal effect was observed in animals exposed to pH 8. LC5096h in pH 4 is high in comparison to the average values reported in literature. Sublethal concentrations of copper were enough to affect the physiological and biochemical parameters, suggesting metabolic and ionic disturbances that can be attributed to copper presence in water. The addition of organic matter did not reduce the effects of copper on the exposed animals.

ASSUNTO(S)

toxicologia desempenho natatório fisiologia cobre fisiologia comparada colossoma macropomum

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