Steven Robertson fell from the scallop dredger St Amant off the coast of Anglesey on 13 January last year.
BBC: Criticism of fishing boat St Amant after death off Anglesey
He said the crew of a scallop dredger chased him off his "own ground" during the attack on Friday.
BBC: Boat attacked in Dorset over 'scallop turf-war'
All seven Scottish crew members died when the Solway Harvester, a scallop dredger, sank off the Ramsey coast in January 2000.
BBC: Solway Harvester scrapping process to begin
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