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

Abstract

To determine differences between commercial size wild and farmed blackspot seabream, some parameters affecting quality were evaluated during shelf life, namely the fatty acid profiles, pH, muscle colour and Quality Index Method (QIM). In addition, a histological study of the lipids' distribution in the myotome (slow or fast twitch) in different dorsal areas was performed. In farmed fish, three diets were tested. One of them was a commercial diet formulated with a high proportion of lipids, mostly from fish oil. The other two diets were formulated with reduced lipid levels by 60%. In one (low lipid diet, LL) the proportions of protein sources were maintained and in the other (low lipid diet+ fish meal, LL+) most of the protein was provided as fish meal.