Bluefins are a type of large, predatory fish that belong to the tuna family. They are also known as tunnies (7 letters) and tunas (5 letters). Bluefins are found in the Atlantic, Pacific, and Indian Oceans and are highly sought after for their meat and oil. They are one of the fastest swimming fish in the ocean and can reach speeds of up to 50 mph. Bluefins are an important part of many commercial fisheries and are considered a delicacy in some parts of the world.