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Seasonal changes in the major lipid classes of plaice serum were examined in fish caught OR the north-east coast of Scotland. Both male and female plaice were sampled monthly between June 1983 and May 1984. Total lipid, total cholesterol, free cholesterol, triglycerides, phospholipids and non-esterified fatty acids were measured using commercial kits validated against standard reference methods. There were no significant differences in lipid levels between male and female fish and, although there were real differences between months for each lipid class, there was no regular pattern over the 12-month period. All the lipid class values, however, reached a maximum in September, which could be related to the increase in feeding after spawning. The smaller peak in February could be associated with the mobilization of lipid reserves for gonadal development and to overcome the effect of starvation during spawning. 0022-1 I 12/86/050595+ 12 SO3.00/0 595 0 1986 The Fisheries Society of the British Isles