Workers cut the head of an Atlantic bluefin tuna on a fishing vessel on the Mediterranean sea, near Garrucha, southern Spanish province of Almeria, March 25, 2010. Delegates at a conference of the 175-nation Convention on International Trade in Endangered Species (CITES) in Doha rejected a proposal to ban trade in bluefin tuna. REUTERS/Francisco Bonilla (SPAIN - Tags: ENVIRONMENT ANIMALS FOOD)