John Fredriksen, a Norwegian shipping and oil industry billionaire who owns 29% of Marine Harvest, surprised anglers and conservationists by directly linking fish farms to plunging wild fish populations - a link the industry has repeatedly disputed. A keen angler who is reputedly worth £3.5bn and has a home in Chelsea, he told a Norwegian newspaper earlier this year: "I am concerned about the future for wild salmon. Fish farming should not be allowed in fjords with salmon rivers."