 Monterey Bay Aquarium's Seafood Watch program have placed all bluefin tunas on the "Avoid" list, and they are also placed on the "Red List" by Greenpeace and the Blue Ocean Institute.The Pacific bluefin tuna is primarily found in the North Pacific, ranging from the East Asian coast to the western coast of North America.It is mainly a pelagic species found in temperate oceans, but it also ranges into the tropics and more coastal regions.