More sharks are being spotted in the North Sea off the coast of Lincolnshire and Yorkshire.
The change in climate is believed to be behind the increase, with rising sea temperatures attracting the creatures.
A BBC One show on Monday warned people in the region that more sharks are being found along the eastern coast.
The sharks are staying for longer periods during the summer, while haddock and cod head towards the colder Icelandic waters.
The Tope shark has made a journey to the North Sea - they are generally regarded as harmless to humans.
The situation is being monitored by marine biologists, including some at Hull University.