Clean Seas Seafood Ltd is an Australian seafood production company specialising in the sea-cage aquaculture of Yellowtail kingfish. It was established by The Stehr Group in 2000, and became the first Australian company fish farming in South Australia to be listed on the ASX in 2005. The company was established by "tuna baron" Hagen Stehr, whose son Marcus remains one of the company's directors. Clean Seas has shore and sea-based fish farming facilities at Arno Bay, aquaculture leases in Fitzgerald Bay and near Port Lincoln and a processing facility at Royal Park in Adelaide. Its tuna interests were originally held by the private company Australian Tuna Fisheries Pty Ltd. Clean Seas' ambition to control and commercialise the lifecycle of the Southern bluefin tuna has not been realised. Wikipedia