Fisherman have been cutting off the fins of the creatures and dumping the rest of the body into the sea.

Shark fin soup is a posh dish in some Far Eastern countries. People are willing to pay a high price for the fins, but not for the rest of the meat.

The poster - donated by advertising firm Saatchi & Saatchi - was inspired by scary shark film Jaws.

It says that man is the biggest threat to the world's dwindling shark population.

The poster will appear in magazines to promote the work of the Shark Trust, which campaigns to protect the creatures.

Over the past 15 years, many shark populations have declined by up to 80%.