A shoal of Bluefin tuna has been spotted off the coast of Cornwall.

"If any fish could be sexy, these fish are", said Dr Lucy Hawkes, Physiological Ecology lecturer at the University of Exeter.

"This is an endangered species", said Dr Hawkes. "It's very difficult to preserve things that are very valuable."

The 500-strong shoal is said to have been seen during a wildlife cruise.

The fish can fetch up to £1 million on the Japanese market.

British fishermen have no quota for the tuna and only countries like France, Spain and Greece are allowed land them and then only up to July.