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D'importantes mortalités ont été notées après la phase d'acclimatation chez des populations de perches et gardonssauvages placées en stabulation. Une diminution de la dureté totale de l'eau de l'ordre de 40 mg/l de CaCO3 sembleêtre à l'origine de la mort des animaux. L'effet de cette baisse des concentrations en Ca2+ et Mg2+ de l'eau paraît êtrepotentialisé par une modification thermique. De plus, ne pourrait-on pas observer dans ces conditions une forte modificationdes seuils de toxicité de certaines substances polluantes ?
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