NMR was used to monitor water soluble metabolites in salmon by-products stored at 4 ° and 10 °C.
High-added value compounds were found that could be used for industrial purposes.
Statistical data elaboration evidenced the main processes occurring during storage.
Salmon by-products freshness was estimated using K- and H-indexes.
The formation of biogenic amines was detected and quantified in the stored by-products.