The Mediterranean Bluefin Tuna is on the IUCN Red List as endangered. Overfishing is taking its toll. In Malta, Bluefin 'ranching' is big business. Fish are captured and kept in pens, often for several years. They are fed on thousands of tonnes of immature Mackerel, before being slaughtered for the lucrative sushi market. Individual fish, weighing over 500 kg can sell for hundreds of thousands of dollars.
In Malta thousands of fish are kept in pens off the coast. The fishermen believe this is a sustainable practice, reacting to demand and reducing overheads. Conservationists believe that the depletion of breeding stock from the oceans will accelerate the species' potential nose dive into extinction. But with demand being so high, is Bluefin Tuna too valuable to be saved?
This short video was shot in two pens, one containing fish weighing 50kg, the other with fish weighing 300kg.