'Rock salmon' (actually dogfish) has been sold as a cheaper fish item in UK fish and chip shops for decades. It now appears that some Mediterranean 'swordfish' and 'tuna' steaks are also actually shark (https://www.theguardian.com/environment/2020/jul/08/seafood-why-your-mediterranean-swordfish-might-actually-be-shark). That small sea apparently has 73 species of sharks and rays, of which more than half are at risk of (at least local) extinction. This scam seems to be driven, to some extent, by declines in fish stocks (as well as greed) but it is sad when you need to identify the species you are eating before deciding whether it is 'sustainable'.
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