Abstract
SUMMARY Information on the density and size structure of an exploited and an unexploited population of Arenicola marina (L.) is compared. The mean monthly fishing mortality is calculated from estimates of population density, size structure, the average monthly number of bait-diggers, and the diggers' selectivity, efficiency and effort. It is concluded that the spawning population is not threatened by the present levels of exploitation. Results are discussed in relation to other aspects of the ecology of A. marina and the exploitation of other polychaetes.
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