Upcycling of Side-Streams On-Board Factory Fishing Vessels

Valorisation of side-streams from the processing of Atlantic cod, saithe, haddock, and golden redfish into fishmeal and oil was studied to document product yields, and the partitioning of main constituents between presscake and stickwater (solubles) in the downstream process. Compared to current industrial practise of presscake fishmeal production, including of the stickwater can increase the fishmeal yield by 23% and protein level by 9%. Additionally, sieving out bone fragments may raise the protein level to above 70%. This approach offers a more sustainable use of marine resources, enhancing the commercial and nutritional value of fishmeal derived from fish processing side-streams.