Abstract
Bioassays designed to test the effect of single or some combination of environmental factors or pollutants on aquatic organisms are usually performed in constant levels of the imposed conditions and commonly in static rather than flowing water. The reason for this is usually one of convenience and practical simplicity and the results are valid for the set of conditions imposed. However, since aquatic organisms are rarely exposed to constant and static conditions, the results of such tests cannot with confidence be extrapolated to field conditions. This is particularly true in the case of estuarine organisms for which, change is the rule.
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