Abstract
Static biotests, such as Daphnia and algae tests, are well known in the checking of water quality. Although they are often called acute tests they are not able to identify short-term accidents or time-dependent variations of toxic substances. Biomonitoring systems were set up to serve as early warning systems. Biomonitors are 24 h a day working systems, using organisms to indicate changes due to the release of toxic substances. This paper deals with the measurement of changes in the behavior of Daphnia with the bbe Daphnia toximeter. Speed, speed distribution, height, distance between organisms, number of Daphnia, and fractal dimension are evaluated to account for the appearance of toxic substances. In this way even low concentrations which do not lead to the death of Daphnia can be detected within minutes. Results of the last two years of field experience and laboratory tests are given.
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