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J.Health Sci., 50(3), 220-225, 2004
Life Cycle Stages and Length of Zebrafish (Danio
rerio) Exposed to DDT
Jules Richard Kemadjou Njiwa,* Paul Muller, and Roland Klein
Centre of Environmental Research, University of Saarland,
D-66123 Saarbrucken Germany
Long-term toxicity growth tests were conducted with DDT using zebrafish
(Danio rerio). The fish were exposed to concentrations of
0.05 mu g/l, 0.5 mu g/l, 5 mu g/l and
50 mu g/l DDT under flow-through conditions. The effect of the compound on the
ecologically important parameters hatching rate, duration
of the developmental stages and growth were the
focus of interest. When exposed to 50 mu g/l DDT, the
hatching rate was 2 to 3 times lower than in embryos
exposed to 0.05 mu g/l DDT. This study demonstrates
that the rearing zebrafish in the pesticide causes a
reduction in body length and the durations of the life cycle stages (LCS) of the offspring are extended.
These effects are increased when the fish are exposed
to higher DDT concentrations.
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