Potential of the Biotic Ligand Model (BLM) to Predict Copper Toxicity in the White-Water of the Solimões-Amazon River.

In this study, we evaluated the capacity of the Biotic Ligand Model (BLM) to predict copper toxicity in white-waters of the Solimões-Amazon River. LC tests using the species Otocinclus vittatus (Regan, 1904) were performed with Solimões-Amazon river water (100%) at 20%, 40%, 60%, and 80% dilutions. A sevenfold decrease in both dissolved and total Cu toxicity was observed in the experiment conducted with 100% when compared to 20% white-water, indicating that physicochemical characteristics of white-water attenuate Cu toxicity.

Biochemical and behavioral responses of the Amazonian fish Colossoma macropomum to crude oil: the effect of oil layer on water surface.

The largest Brazilian terrestrial province of petroleum mining is located at the margins of Urucu River, Amazonas. Mined crude oil is transported along 400 km across Solimões River to be refined in Manaus. Thus, the main goal of this study was to evaluate the effects of crude oil exposure on biochemical, physiological and behavioral parameters of juveniles of the Amazonian fish tambaqui (Colossoma macropomum).

Linking hematological, biochemical, genotoxic, and behavioral responses to crude oil in the Amazon fish Colossoma macropomum (Cuvier, 1816).

Despite safety protocols, crude oil extraction and transportation in the Amazon basin has a potential for inadvertent oil spills, which can impact aquatic organisms in local rivers. The objective of this study was to assess the effects of crude oil on juvenile Amazonian fish tambaqui, Colossoma macropomum, at various biological levels. Furthermore, the effect of crude oil on response to alarm substance, an important communication system in fish, was reported for the first time.