Seasonal variation in capelin was examined by measuring chemical and lipid composition, including anti- and pro-oxidants. Lipid oxidation and other deterioration products were monitored. Results on chemical changes during landing of whole capelin indicated that the spoilage processes were intensive. This was evident by decomposition of endogenous antioxidants and gradual onset of rancidity and spoilage. Capelin from each season was found to have some distinctive chemical characteristics. High autolytic activity as well as high content of astax-anthin was found in the heavily feeding summer capelin. Autumn capelin contained the highest lipid content and the lowest stability towards lipid oxidation. The most uniform quality was observed in the winter capelin, while the spawning, fat depleted spring capelin contained the highest content of tocopherols.
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Bragadóttir et al. (2002) studied this question.
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