Cas inexpliqués de mortalité de poissons en stabulation: Possible synergie entre dureté et température

Abstract

High death rates were noted in wild perch and roach populations shortly after the stage of acclimatization in a tank. A decrease in water hardness by about 40 mg/l of CaCO3 seemed to cause the mortalities. The effect of reduced ambient Ca2+ and Mg2+ levels may be promoted by a thermal modification. Furthermore, in these conditions, couldn't we observe a strong alteration in threshold concentrations of pollutants?. © Gauthier-Villars, 1993.