Abstract
Quantitative samples of Gammarus pulex L. taken from a small Danish stream during 1975 showed mean annual population densities varying from 500 m−2 in early May to 5 500 m−2 in late September. The mean annual biomass was 1.5 g dry weight m−2. No discrete cohorts could be distinguished from the size frequency distributions. Annual production, estimated by the size-frequency method, was 3.9 g dry weight M-2 and P/B ratio was 2.6. The contribution to trout energetics may have been as much as 17%.
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