[Scubatravel.co.uk]

Several landmark studies have, over the past 20 years, highlighted the problem of mislabelled fish. One-third of fish on sale in the US is not the species it is sold as, and one-quarter of cod and haddock sold in Ireland is neither of these. Now an exercise in eco-forensics has found that the certification scheme run by the Marine Stewardship Council (MSC), a global not-for-profit organisation, offers a way of ensuring you get what you think you're buying.

http://www.newscientist.com/article/mg20727693.600-fish-certification-scheme-shows-its-true-colours.html