Pascal Kobeh / Atlantic bluefin tuna (Thunnus thynnus) within tuna farm, containing around 1000 per net. Saint Paul's Bay, Malta. Mediterranean Sea.

Pascal Kobeh / Diver with Atlantic bluefin tuna (Thunnus thynnus) within tuna farm, containing around 1000 per net. Saint Paul's Bay, Malta. Mediterranean Sea. October 2012.

Pascal Kobeh / Diver with Atlantic bluefin tuna (Thunnus thynnus) within tuna farm, containing around 1000 per net. Saint Paul's Bay, Malta. Mediterranean Sea. October 2012.

Jeff Rotman / Fishermen landing large Atlantic bluefin tuna (Thunnus thynnus) during 'Mattanza', a traditional tuna cull in which the Sicilian fishermen trap, catch and slaughter Mediterranean bluefin tuna. Favign...

Alex Mustard / School of large Atlantic bluefin tuna (Thunnus thynnus) captive in growing pen. Depsite looking much smaller in the photo, these fish were 1.5m (5ft) long. Malta. Mediterranean Sea.

Luis Quinta / Atlantic bluefin tuna (Thunnus thynnus) shoal in open ocean, North of Santa Maria island, Azores, Portugal, September.

Luis Quinta / Atlantic bluefin tuna (Thunnus thynnus) shoal in open ocean, North of Santa Maria island, Azores, Portugal, September.

Luis Quinta / Atlantic bluefin tuna (Thunnus thynnus) shoal in open ocean, North of Santa Maria island, Azores, Portugal, September.

Richard Herrmann / Atlantic Bluefin Tuna (Thunnus thynnus) school, Turkey

Franco Banfi / Dogtooth tuna (Gymnosarda unicolor), Pulaa Thila, Maldives, Indian Ocean

Jeff Rotman / Mr. Castiglione, owner of processing plant for Bluefin tuna (Thunnus thynnus) with a 320 kilo giant bluefin tuna caught using the traditional mattanza technique being displayed at a processing plant....

Jeff Rotman / Mattanza fishermen landing Giant Bluefun tuna (Thunnus thynnus) using a technique in which a maze of nets are set, leading to a central pool, Favignana, Italy, May / June