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The major primary food source found on a typical Natal reef in South Africa is macrophytic detritus, largely of marine origin. Rapid release of soluble contents of the detritus is caused by vigorous surf action on the reefs; this was demonstrated experimentally. Free-living bacteria are the most common microorganism found in the water column and they appear to be heterotrophically the most active. It was thus postulated that they must use this dissolved substrate; if uniformly labelled, it should provide a suitable tracer for studying their heterotrophic activity. A salt-tolerant Chlorella sp. was cultured with NaHY4CO, for sufficient duration to permit uniform labelling and its soluble cell contents and excretory products were extracted for this purpose. Extracts of specific activity 0.67 pCi mg-' organic carbon and 58.07 yCi mg-' organic carbon were prepared and used in heterotrophic potential experiments. The results are evaluated and compared with results of glucose uptake measured in parallel experiments and during previous seasonal sampling. The results indicate that microbial heterotrophic activity exceeded primary production by phytoplankton in the study area

Heterotrophic utilisation of a labelled algal extract in water samples from a subtidal reef