Spanish Research Tags Fish With Barium Isotopes To Distinguish Wild Salmon From Farmed Fish

Researchers at the University of Oviedo in Spain have come up with a way of tagging gunpowder which allows its illegal use to be detected even after it has been detonated. Based on the addition of isotopes, the technique can also be used to track and differentiate between wild fish and those from a fish farm, such as trout and salmon.

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