Abstract
Modifications to a standard biological water quality assessment method, used in Belgium since 1979, were studied. As a result, we recommend the following: - samples should be processed live - samples should not be washed through a series of sieves - systematic units represented by only one individual should be included in the calculation of the biotic index. Using this modification, the biotic index can be calculated more rapidly and shows a higher correlation with a chemical water quality assessment index.
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