least 10% of every tuna haul caught on a FAD is bycatch including sharks, juvenile bigeye and yellowfin tuna, marlin, rays, warehou and mahi mahi. That's not good for the ocean and it's not good Aussie fishermen. So next time you go into the canned tuna section of the supermarket, check the Greenpeace Canned Tuna Guide before you buy to make sure your tuna wasn't caught using a FAD.