Abstract
Two experiments were conducted to evaluate the interference of magnesium on zinc adsorption in freshwater fish pond sediment and zinc accumulation in the freshwater teleost Labeo rohita (Hamilton). The study demonstrated that increasing the concentration of magnesium as magnesium sulfate from 100 to 400mgkg–1 decreased the adsorption of zinc in sediment. The maximum adsorption was found at a concentration of 100mgkg–1 of Mg2+ and the minimum with 400mgkg–1 of Mg2+. This study also demonstrated that the exposure of fish to 0.25mgL–1 of zinc as zinc sulfate with different concentrations of magnesium (100, 200, 300, and 400mgL–1) for 14d resulted in the minimum accumulation of zinc in L. rohita (2.97mgkg–1 dry weight) at 200mgL–1 of Mg2+, while the maximum accumulation (8.47mgkg–1 dry weight) occurred with no magnesium treatment.
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