Tuna was once considered by the samurai unfit to eat, and is now one of the most popular fish in Japan. It was in 1903 that a sardine shortage led to a cannery filling the cans with albacore, a species of tuna which had no commercial value.

The canned tuna soon became popular, and the tuna industry came into being. Dolphins became a bycatch of tuna, and in 1972 Congress enacted the Marine Mammal Protection Act (MMPA) to protect dolphins from harmful fishing methods.

These efforts to protect dolphins have paid off, with dolphin deaths in the eastern tropical Pacific Ocean tuna fishery decreasing by 97%. Various dolphin safe labels are now being used to verify that dolphins are not being harmed in the tuna fishing process. However, the US Consumers Union has explained that this is no guarantee as there is no third party and independent verification of the dolphin friendly claims.