The environment advocacy group, the Pew Charitable Trusts, said independent surveys show fishing has depleted bluefin stocks to just 2.7 percent of the levels that existed before the advent of commercial fishing.
The director of Pew's global tuna conservation campaign, Amanda Nickson, said little has been done by key agencies such as the Tuna Commission and governments and this mean a two year moratorium on commercial fishing was needed.
She said under such a scheme blue fin numbers could bounce back quite quickly and the fishing nations need to take action.
