English Abstract A Daphnia magna long term reproduction toxicity test
was performed as part of a pilot ring test in the frame of the development
of the EC test guideline "Prolonged toxicity study with Daphnia magna:
effects on reproduction". The participation of our laboratory was directed
at the comparison of the performance of two clones of D.magna and the
influence of three different test media on the results of this reproduction
toxicity test. In the experiment differences in reproductive performance
between clones were observed, depending on the test media
used.
