Development and Validation of Methodology for the Confirmation of the Origin of Wild and Farmed Salmon and Other Fish
Abstract:
A combination of GC fatty acid composition and the ?18O and ?15N IRMS measurements of the fish oil and choline respectively appear to provide conclusive differentiation between wild and farmed salmon. Both these methods closely reflect the fish diet, which is the principle factor of discrimination as farmed fish feed contains higher proportions of vegetable oil. The isotopic data can also provide added indication on the use of C3- or C4- derived vegetable oils. These methods could therefore be used to monitor the type of oil used in fish feed and could be included in an overall traceability system for the fish producers.The results obtained regarding geographical origin are not as clear-cut.
