SUMMARYLipid damage produced during Atlantic pomfret (Brama brama) chilled storage (up to 19 days) was studied. For it, free fatty acid (FFA) and conjugated diene (CD) formation, peroxide value (PV), thiobarbituric acid reactive substances and fluorescent compounds formation were measured in two different white muscle zones (dorsal and ventral). Comparison with volatile amine formation (total volatile base-nitrogen, TVB-N; trimethylamine-nitrogen, TMA-N) was carried out. A gradual lipid hydrolysis was observed in both zones along the whole experiment. CD and peroxides formation was important during the experiment; peroxides showed the highest value at day 15 in both zones, that was followed by a peroxide breakdown at day 19. Interaction of oxidized lipids with nucleophilic compounds present in the fish muscle led to a gradual fluorescence development during the storage time in both zones. Mean values of the lipid content showed to be higher in the ventral zone than in the dorsal one, although significant differences could not be detected (p<0.05). Concerning the lipid damage, very small differences (p>0.05) could be assessed between both zones. TVB-N content showed no variation till day 15. At day 19, a sharp increase was observed for both muscle zones. In the case of TMA, a gradual increase was observed along the whole storage time for both muscle zones. Higher mean values were obtained in TVB-N and TMA-N indices for the ventral zone than for the dorsal one, according to a closer location to viscera where microorganisms are known to concentrate. Among the different indices tested for quality assessment, TMA-N and fluorescence formation were the most accurate for following the quality loss during Atlantic pomfret chilling, showing satisfactory (r 2 ≥0.87) non-linear fittings with the chilled storage time.2