1948 the Parliament of Iceland passed a law establishing fisheries conservation zones. 1951 Iceland proclaimed 12-mile exclusive fishing zone
1961 by exchange of notes, UK & Iceland agreed that UK would no longer object the 12-mile fishery zone and that each party could refer a dispute concerning Iceland’s extension of its fishing zone to the ICJ.
1970 Iceland claimed 50-mile fishery zone.
UK vessels had been fishing in Iceland waters for centuries, and they were also concern with the fisheries conservation
[1977 UK claimed its own 200-mile exclusive fishing zone]