Marine biologists at Swansea University say it was a bigeye tuna - usually found warmer waters in open oceans.

Weighing 83.5lb (38kg) and measuring 1.34m in length they said it was a "very unusual find."

The tuna, which was put into deep freeze at a Swansea fish firm after being brought ashore, has since been passed on to the university's department of biological sciences.