Juvenile meagre were sampled at intervals during their first 500 days in a cage-based fish farm. Fish muscle showed a relatively low fat content (0.65???2.0%) when compared with other species of farmed fish, corroborating the consideration of meagre as a lean fish. At the beginning of the assay, saturated and monounsaturated fatty acids were in a similar proportion (approximately 30%), while polyunsaturated were close to 39% of total FAs, the n-3:n-6 ratio being of 3.8. Throughout the experiment a notable reduction in the sum of PUFA n-3 and an increase of linoleic (18:2n-6) and oleic acid (18:1n-9) was found. These changes led to a fall of n-3:n-6 ratio to values close to or lower than 1.0. Most probably, these changes reflect variations in the feeding regime applied during farming. In any case, fish offered good indices of lipid quality for human consumption. ; Se han muestreado corvinas juveniles durante los 500 primeros d??as de cultivo en jaulas flotantes. El contenido en grasa muscular fue relativamente bajo (0,65???2 %) en relaci??n con otras especies de peces cultivados, lo que corrobora su consideraci??n de pez magro. Al principio del ensayo, los ??cidos grasos saturados y monoinsaturados mostraron una proporci??n del 30%, mientras que los poliinsaturados de un 39% del total de FAs, siendo la relaci??n n-3/n-6 de 3,8. A lo largo del periodo experimental hubo una reducci??n notable de PUFAs n-3 y un incremento de ??cido linoleico (18:2n-6) y, en menor proporci??n, de ??cido oleico (18:1n-9), lo que llev?? a una disminuci??n de la relaci??n n-3/n-6 hasta valores cercanos o menores de 1,0. Estos cambios reflejan variaciones en la composici??n del alimento durante el cultivo. En cualquier caso, la corvina ofrece buenos ??ndices de calidad lip??dica para la salud del consumidor.