C or N body mass (by a factor1.5- to 1.7-fold), but not to the WM body mass. The O:N ratios (respiration/ammonia excretion.by atoms) reported for 6 cephalopods (median: I3.2) and 33 fishes (24.2) suggested the predominance of procein as a metabolite in the former and carbohydrate or lipid in the latter.