Abstract: | In the daily exchange of the medium with only 7.1 mg/l Ca2+ and 0.7 mg/l Mg2+ during the batch experiment the LC50,96h for Cyprinus carpio is 0.063 mg/l Cu2+ and 3.12 mg/l Zn2+ at water temperatures of 11 to 14°C. Significant differences in mortality as referred to the LC50,12h occur for copper only after 72 h of exposure and for zinc after 48 h of exposure. The values of LC50,96h are clearly lower for both metals in the investigations described than most data given in literature for different fish species. |