Campaigners said Welsh waters now boast some of the biggest fish in the world and want a fishery established to attract international anglers. Mr Batey, from Sarn, Bridgend, landed the tuna while returning from fishing in an area of the Irish Sea known as the Celtic Deeps, approximately 30 miles off the west Wales coast. During the hour-long struggle, he passed the rod to Mr Nott, from Cwmaman, Rhondda Cynon Taf, while working with skipper Andrew Alsop. It was measured from the nose to the fork of the tail while a globally recognised formula then gives an approximate weight.