Bluefin tuna fishing agreement; can it be enforced?

ICCAT [International Commission for the Conservation of Atlantic Tunas] managed to come up with an agreement to reduce the catch limit on Mediterranean bluefin tuna:

Bluefin tuna fishing to be cut 30% over two years (Mediterranean and Atlantic Ocean)

They say: "What's more, the revised plan will not simply reduce fishing pressure on the stock drastically, it also defines mechanisms for control throughout the marketing chain, and closes many outstanding loopholes," AND

The commission said that the quota cuts were backed up with a four-month reduction in the season of the industrial tuna fishing fleet, which account for the vast majority of catches.

So: is it enforceable? and is it enough?