SUMMARYA comparison of the lipid damage produced in different hake zones was carried out during the frozen storage at -11°C and -18°C. Three light muscle zones and the dark muscle were considered. Lipid oxidation (conjugated dienes; thiobarbituric acid index, TBA-i; fluorescence formation) and hydrolysis (free fatty acids, FFA) were determined.The most predominant lipid damage in all zones was hydrolysis, reaching at the end of the storage values round 40% (for the light muscle zones) and 12% (for the dark muscle) of total lipids at -11°C. Significant (p<0.05) correlation values (r = 0.67-0.85) relationships between the frozen storage time and the FFA content were obtained for the four muscle zones at both temperatures. A comparison of regression lines slopes in the different zones showed that a lower (p<0.05) lipolitic activity was produced in the dark muscle compared to the three light zones at both temperatures. A low lipid oxidation development was produced in the three light muscle parts so that no significant differences between themselves could be assessed. However, the dark muscle showed a higher oxidation development (TBA-i and fluorescence formation) as a result of a higher lipid content and the presence of prooxidant constituents.

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