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Tuna's Red Glare? It Could Be Carbon Monoxide

The Fish Site
by The Fish Site
8 October 2004, at 1:00am

US - Buyers of fresh tuna, whether at the sushi bar or the supermarket, often look for cherry-red flesh to tell them that the fish is top-quality. But it has become increasingly likely that the fish is bright red because it has been sprayed with carbon monoxide.