Along the period of operation of the hydroelectric power plants (HPPs) existing in the
Tocantins river basin, some events of icthyofauna mortality were documented. River dwellers
watch every day, carcasses of dead animals on the banks of the river. In this sense, this work
aims to identify elements that may contribute to the mitigation of fish injuries and death in
HPPs, based on an analysis of the conditions in Peixe Angical (PEA), Luís Eduardo Magalhães
(LEM) and Estreito (EST). During the research, there was a great deficiency in the detailing
of the information on the rescued dead animals, the lack of approaches for the evaluation of
the risk of death episodes in cases of maneuvering, and the absence of studies aiming to analyze
characteristics of the acoustic contribution of plant equipments in the icthyofauna behavior.
For this purpose, a rescue protocol was proposed, a risk assessment and the acoustic landscape
resulting from the operation of LEM turbines and spillways was presented.
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