Blackspot seabream (Pagellus bogaraveo) fed different diets. Histologic study of the lipid muscle fiber distribution and effect on quality during shelf life

Lipid depots were not found to be different in the myocytes of the fast-twitch fibers. However, regional differences were identified in the slow-twitch fibers depending on the area and the diet, whether in the cranial, medial or caudal portion of the dorsal myotome. The worst scores of the QIM were recorded for the Control diet and the wild fish group. In addition, QIM showed a positive correlation with total n-3 and a negative with other lipid fractions. The a* values in skin and the chroma in muscle of the wild fish were superior to those measured in farmed fish. Fish fed the LL + diet had higher fillet protein content than that of the wild counterpart. As for nutritional value, farmed fish were able to deposit more DHA than was offered in all experimental diets used, especially with the LL + diet which yielded threefold more DHA.