*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.

Frances puts her corned beef to one side for a moment Frances volunteers for our biodiversity campaigns and is next up in the blog relay, a whistle-stop tour of Greenpeace staff here in the UK. Click here to catch up on the other entries.

People sometimes ask me why I volunteer for Greenpeace. Well, let's see what I do and why.

As a volunteer on the forests and oceans campaigns, my job involves doing investigative research work. The work is pretty varied, and is a combination of doing desk research and getting out and about in the big wide world.

For example, as part of our Amazon work, I've been visiting various supermarkets, looking at whether we can link the beef products on their shelves back to companies who we know are involved in destroying the rainforests. Today, cattle farms occupy nearly 80 per cent of all deforested land in the Brazilian Amazon. Many of the beef products from these farms are sold on the world market. The Amazon doesn't belong on a supermarket shelf labelled as corned beef!

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.

The Sunday Telegraph reports this morning that, thanks to Greenpeace investigative work*, we now know that London’s Nobu restaurants, among the capital’s favourite celebrity hangouts, are serving up endangered bluefin tuna as sushi.