The objective of the program is to provide a basis for advancing science-based fisheries management for Atlantic bluefin tuna. Such advancement will depend upon improvements in understanding of the fisheries harvesting and the biology of bluefin tuna, especially regarding the effects of mixing and movement between the eastern and western Atlantic stocks on monitoring stock abundance. Contracting Parties to the International Convention for the Conservation of Atlantic Tunas (ICCAT), of which the US is one, and other partners have embarked upon a $25 million research program on bluefin tuna, expected to span 6 years as a step toward improving ICCAT's science based management approach for fisheries affecting bluefin. Research sponsored under this funding opportunity represents a contribution to this partnership.