A sushi chef serves sushi of high-quality fatty Atlantic bluefin tuna or "o-toro sushi nigiri" at a sushi restaurant in Tokyo March 18, 2010. The outcome of a drive to ban trade in Atlantic bluefin tuna, prized as a delicacy in Japan, is too close to call before U.N. talks which started last Saturday that will test the world's ability to protect dwindling fish stocks. The 175-nation meeting of the Convention on International Trade in Endangered Species (CITES) in Doha, Qatar, from March 13-25, will vote on about 40 proposals for regulating trade in species including sharks, corals, elephants and polar bears. REUTERS/Issei Kato (JAPAN - Tags: POLITICS ENVIRONMENT FOOD)