Blackfin is a term used for several different species of fish, most commonly associated with tuna. However, there are a number of synonyms for this term, depending on the region and language. In the Hawaiian Islands, for example, blackfin is known as ahi, while in Japan it is called kuro maguro. Other synonyms for blackfin include yellowfin, bluefin, and albacore, all of which are distinct species of tuna. While blackfin typically refers to a smaller variety of tuna, it can also be used to describe other dark-colored fish such as blackfin barracuda, blackfin snapper, and blackfin shark.