When surimi (a fish-based food product) is frozen for long periods, its pleasant fish aroma fades while unpleasant fishy and oily smells develop. This study found that this change happens because fats in the surimi oxidize and break down during freezing. Using faster freezing methods and chemically strengthening the surimi’s structure can help preserve the original flavor. The research identified specific fats that are responsible for creating unwanted odors, providing guidance for better preservation techniques.