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Maturation and spawning diets for flatfish broodstock, such as Southern Flounder Paralichthys lethostigma, have received little research attention, despite their critical role in the reproductive performance. During the spawning season, which is when Southern Flounder broodstock produce multiple egg batches, they rely on their diet to supply nutrients to the eggs. Lipids are an important class of nutrients for offspring development. The objective of this brief communication is to describe the changes in egg lipid classes during the spawning season following a diet change. Female broodstock were fed three diets after the first spawn (week 0)—a control diet (equal weights of Spanish Sardines Sardinella aurita and brown shrimp Farfantepenaeus aztecus), a shrimp‐only diet, and a sardine‐only diet (n = 3, 3, and 4, respectively)—for a period of 6 weeks and the lipid composition of the eggs was measured every 2 weeks …