Ref ID : 842
Ulrich Memmert; Bioaccumulation of zinc in two freshwater organisms (Daphnia magna, crustacea and Brachydanio rerio, pisces). Water Research 21(1):99-106, 1987
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Daphnia magna and Brachydanio rerio are important test organisms in toxicity tests. The bioaccumulation of zinc in these species was investigated in two semistatic experiments in synthetic freshwater with a zinc concentration of 250 ug/l. Fishes were fed with polluted or unpolluted Daphnia magna to determine the significance of zinc accumulation from contaminated natural food. Daphnia magna accumulates zinc to a high extent within days. Uptake from food particles substantially contributes to the zinc accumulation in filter-feeding Daphnia; their zinc content strongly depends on the total but not on the dissolved zinc concentration in water. Zinc concentration of Brachydanio rerio increases only to a small extent during the 5 weeks accumulation time. They accumulate no additional zinc from the food source. In unpolluted and polluted Brachydanio a significant negative correlation exists between whole body zinc concentration and body dry weight.