^{Fish Protein and the secrets hidden in a can of tuna}

^{No one would say that several species of tuna are in danger of extinction by observing the gigantic shelves where the tuna cans are in supermarkets. Tuna, bonito, in oil, in tomato, in pickled, in glass jars, in cans of different sizes, with carton or without ... Which to choose? Greenpeace has evaluated 14 brands that sell tuna in Spain and has just launched the second edition of the tuna guide to help consumers make a more sustainable decision}

^{http://blog.rtve.es/vueltayvuelta/2015/10/secretos-ocultos-lata-atun.html}