UK Nature and Environment

Built like a torpedo, weighing more than a male polar bear when fully grown and fetching prices in Japan of more than £2m for a single fish, the bluefin tuna was once an abundant apex predator in British waters. In the 1960s, these warm-blooded aquatic hunters disappeared – pushed to the brink of extinction in the eastern Atlantic by overfishing.

But since 2014, the enormous migratory fish have returned in their thousands off the coast of south-west England after deep cuts to fishing quotas in the eastern Atlantic to revive the species. Nobody is really sure why they are back in such great numbers – with populations also recovering in the Mediterranean, where the vast majority are caught – but bluefin tuna is no longer listed as an endangered species in the UK, and is now often spotted hunting close to shore by wildlife photographers. With its return, minds have also turned to how to catch it without causing it to vanish from British waters again.