Having made a startling movie which has changed the way people think about what’s on their dinner plate, Charles Clover and the End of the Line team have now turned their attentions to restaurants which are still serving endangered fish.

A survey of more than 100 top restaurants conducted for their new guide, fish2fork.com, found that nearly 9 out of 10 were serving at least one 'fish to avoid' from over-exploited stocks. And some of the most critically-acclaimed eateries are among the worst offenders - 7 out of 25 Michelin-starred restaurants visited served species officially listed as endangered on the International Union for the Conservation of Nature's Red List.

*Bluefin sushi will only be available for a limited period because bluefin will soon be extinct. © Ultimate Holding Company / Greenpeace

Bluefin tuna is an endangered species, and it's the oceanic equivalent of a tiger, rhino, or panda - yet it is still being served up as expensive sushi in restaurants. In London alone, there are dozens of venues serving up bluefin, although the celebrity hang-out Nobu is probably the most high-profile culprit.

Our politicians have failed on bluefin tuna, they ignore the scientific warnings, and continue to set quotas that are then ignored by the fishermen.

If we want to stop bluefin from becoming extinct in just a few years then we need to take action now.

Moules marinière à la Michelin-starred Raymond Blanc

Let's face it, even if you're Raymond Blanc, buying the right fish these days is not so simple.

And right now many of our traditional favourites, from cod to tuna, are disappearing rapidly from the seas due to overfishing and the effects of climate change. Bottom-trawling boats are sailing farther and fishing deeper than ever before, hauling in hordes of fish with heavy, weighted nets that tear up the ocean bottom. Read more »

Entries at the Milan Sushi Awards earlier in the year (image by Thomas Lu, licensed under Creative Commons Attribution 2.0)

Working at Greenpeace often means that I find myself in some unusual places - inside a nuclear power station, atop an aeroplane or in a palm oil factory. But I certainly never expected to find myself at an international sushi awards ceremony.

Catch them while you can - endangered bluefin tuna © Greenpeace/Gavin Newman

When we said a few weeks ago that customers of the Nobu chain of high-class sushi restaurants wouldn't be aware that the bluefin tuna being served there was endangered, we never thought they would respond to our complaint in quite such a literal manner. But now diners can clearly see which dishes include tuna from endangered stocks because it's written on the menu. As reported in the Sunday Telegraph and as a result of Greenpeace's investigative work and subsequent discussions with Nobu, customers at the up-market eatery will now be able to clearly identify the endangered species on the menu.