It's worth stopping to think about the true price of the salmon you eat. And there's quite a lot to think about.

Salmon is one of the biggest international seafood commodities, and in the UK it's easily one of the most consumed and most conspicuous species in our supermarkets and restaurants. But the vast majority of the salmon you'll find on shelves or plates these days has been farmed rather than fished. Partly that’s because there's hardly any wild Atlantic salmon left, but it's also because salmon's popularity has grown and it has gone from being a delicacy to become more of an everyday food in the past few decades.

*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.