Aquaculture problems: Farming wild-caught fish
Prior to 1995, very little bluefin tuna was farmed this way in the Mediterranean. These days, more than half the catch is farmed.
The growth of the farmed tuna industry has dramatically increased the number of bluefin tuna caught each year from an already overexploited stock. Some of the tuna caught for farming are juveniles - which will not be able to reproduce in the wild and renew the wild stocks.
This kind of fish farming has had a similarly devastating affect on wild bluefin tuna populations in southern Australia, as well as on European eel populations.