Abstract

The growth of juvenile Manila clams, Tapes japonica, was examined on diets of the diatom Thalassiosira pseudonana (3H) of similar cell concentrations but of differing C N ratios (by atoms) over a period of 4 weeks. Bivalve tissue growth was correlated with the total quantity of dietary nitrogen available rather than dietary carbon; however, dietary C N ratios of 8.4–10.5 appear superior to higher or lower values. The use of C N ratios as an indicator of nutritional value in aquaculture food species, and measurement and interpretation of the ratio are critically reviewed.

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