Is this fish too expensive to save?

Yesterday the UN body charged with protecting the world’s endangered species, The Convention on International Trade in Endangered Species (CITES) strongly rejected an American call to ban the commercial fishing of the Blue Fin Tuna, which they claim is in serious decline, at a Doha Conference.  Most countries at the conference argued it should be managed by the fising nations involved in this trade and that stocks are sustainable with the right managment.