Abstract
This paper deals with the protective effect against acute cadmium toxicity in rainbow trout previously acclimated to cadmium solutions at low concentrations.Four groups of thirty-five fish weighing about 4g, which bad been held in tap water, concentrations of 0.0007, 0.003, and 0.009ppm cadmium solution for 15 days, were transferred into 0.14ppm cadmium solution. Toxicity curves clearly showed that fish previously acclimated to 0.003 and 0.009ppm cadmium solutions survived longer than control fish. Previous exposure to 0.0007ppm cadmium solution prior to toxicity testing had little or no effect on acute cadmium toxicity.These results suggest that acclimation of rainbow trout to sublethal concentrations of cadmium has a marked effect on their lethal tolerance to cadmium.
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