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Effect of calcium and magnesium on copper, cadmium, and some essential elements of Indian major carps Labeo rohita (Hamilton) and Catla catla (Hamilton) treated with copper and cadmium

The effect of calcium and magnesium either singly or in combination on accumulation of cadmium and copper in Labeo rohita (rohu) and Catla catla (catla) was investigated in this study under laboratory conditions. The investigation showed that copper accumulation in rohu exposed to 0.25 mg L−1 of copper for 14 days reduced from 31.0 ± 0.4 mg kg−1 at no calcium/magnesium treatment to 3.5 ± 0.2 and 2.2 ± 0.1 mg kg−1, respectively, at 75 mg L−1 calcium or magnesium treatment. The copper level in catla exposed to 0.20 mg L−1 of copper for 14 days reduced from 5.7 ± 0.1 mg kg−1 at no calcium/magnesium treatment to 3.4 ± 0.2 and 3.3 ± 0.1 mg kg−1, respectively, at 300 mg L−1 calcium or magnesium treatment. The cadmium accumulation in rohu exposed to 0.20 mg L−1 of cadmium for 14 days reduced from 1.7 ± 0.1 mg kg−1 at no magnesium treatment to 1.4 ± 0.1 mg kg−1 at 120 mg L−1 magnesium treatment. The cadmium accumulation in catla exposed to 0.20 mg L−1 of cadmium for 14 days reduced from 0.8 ± 0.2 mg kg−1 at no magnesium treatment to 0.6 ± 0.2 mg kg−1 at 80 mg L−1 magnesium treatment. Copper and cadmium treatments also reduced some essential microelements of rohu and catla. Both the fishes restored these elements at different levels of calcium and magnesium.