Long-chain omega-3 fatty acids such as eicosapentaenoic (EPA) and docosahexaenoic (DHA) are health beneficial lipids found in high concentration pelagic fishes, including Atlantic mackerel. While EPA DHA sensitive to oxidation during fish storage processing, post-mortem degradation the first hours following death is poorly documented. Here, we stored at two temperatures (2–4 °C 18–20 °C) monito...