Activists hold an underwater banner on a fish aggregation device (FAD) reading 'Ban the Fad' to protest FAD fishing's role in the overfishing of Pacific tuna. Around 10% of the catch generated by purse seine FAD fisheries is unwanted bycatch and includes endangered species of sharks and turtles. The catch of large amounts of juvenile bigeye and yellowfin tunas in these fisheries is now threatening the survival of these commercially valuable species. Greenpeace is calling for a total ban on the use of fish aggregation devices in purse seining and the establishment of a global network of marine reserves.