The processing of freshwater crustaceans for ecophysiological studies can be simplified considerably if species determination, selection and measurements of the specimens are performed after freezing and lyophilization. As the zooplankters do not change shape during this process, reliable taxonomic determination can be performed with dried animals. Besides easy handling, this procedure ensures minimization of metabolic losses due to prolonged exposure to room temperature, and significantly reduces losses of radiotracer material in grazing studies.
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Berberović et al. (1989) studied this question.