Abstract
The biochemical constituents of mussels both infected and free from the copepod parasite Mytilicola intestinalis Steuer have been determined over a period of 2 years. All the constituents except moisture content (i.e. lipid, protein, carbohydrate and ash) were determined from dried mussel flesh, and all showed seasonal variation, the changes of which were correlated to the breeding cycle of the mussel.