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The measurement of macroinvertebrate biomass involves time-consuming procedures and the destruction of specimens. However, from simple wet weight (WW) measurements, conversion factors provide rapid estimates of ash-free dry weight (AFDW) that facilitate large-scale comparisons of secondary production and energy flow. From a compilation of published and unpublished data, we have calculated general conversion factors for 28 taxonomic groups of benthic marine macroinvertebrates, as well as for several species of commercial importance. Despite methodological and regional &fferences among studies, narrow confidence limits surrounded mean values for converting from WW to AFDW for polychaetes (16%), prosobranch gastropods (7.5%). bivalves (5.8%), amphipods (16%), and decapods (16.5 %).
Ricciardi et al. (1998) studied this question.