Longfin mako. Photo courtesy National Marine Fisheries Service

at the top center along witha 17
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Longfin smelt, bottom, grow up to 5 inches long, or nearly twice as long as Delta smelt, shown at top of photo. Photo courtesy California, Department of Fish and Wildlife
There is presently no commercial or sport fisheries targeting longfin smelt stocks in Alaska.
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There are many aquacultured variations to the "natural" Rosy Barb. The Longfin Rosy Barb has the same coloration but longer fins than the natural fish; use caution with any potentially fin-nipping tankmates. Longfin makos attain lengths up to 13.7 feet. Photo courtesy National Marine Fisheries Service
Photo provided by FlickrLongfin makos attain lengths up to 13.7 feet. Photo courtesy National Marine Fisheries Service
Photo provided by FlickrAnyway I think this post is still valid and the point is good, don't by short fin fish and expect longfin offspring
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Other Names: The albacore, (Thunnus alalunga), is a type of tuna in the family Scombridae. The Japanese name is tombo. This species is also called albacore fish, albacore tuna, albicore, longfin, albies, pigfish, tombo ahi, binnaga, Pacific albacore, German bonito, longfin tuna, longfin tunny, or even just tuna. It is the only tuna species which may be marketed as "white meat tuna" in the United States.
Market Description: Albacore is the lightest-fleshed tuna, with white to pink flesh and a mild flavor.
The main sources of albacore tuna are Japan and Taiwan, followed by Spain and the United States. Albacore tuna sold in the U.S. market are primarily from Taiwan. Canned tuna, however, comes mainly from Thailand, Indonesia and Ecuador.
Albacore is a prized food, and the albacore fishery is economically significant. Methods of fishing include pole and line, long-line fishing, trolling, and some purse seining. It is also sought after by sport fishers.ange & Habitat: It is found in the open waters of all tropical and temperate oceans, and the Mediterranean Sea. Albacore, used for canned white tuna, is a popular, widespread commercial fish. Among the fastest fish in the sea, tunas migrate thousands of miles in mixed schools. Albacore grow to a maximum 5 feet, (1.5 meters).

Identification & Biology: The pectoral fins of the albacore are very long, as much as 50% of the total length. The dorsal spines are 8 to 10 in number, and well forward of the rays of the dorsal fin. The anterior spines are much longer, giving a concave outline to the spiny part of the dorsal fin.It is possible to keep multiple Longfin Bannerfish in the same tank. In the ocean they form small schools and pairs. They do need a larger tank when keeping multiples given their adult size and their need for adequate swimming space. They are quite passive and rarely bother tank mates. They may get bullied by larger fish species such as tangs and triggers.The Longfin Bannerfish can be a good choice given the proper aquarium setup. The Heniochus species are often lumped in with the Buttefly fishes but the Heniochus species are usually much easier to care for than most of the butterfly species. We too have grouped them in with the butterfly species for convenience. The Longfin Bannerfish is also known as the "Poor Man's Moorish Idol" since it sort of resembles the but the bannerfish is better suited to aquarium life. They are striped white and black with yellow dorsal and caudal fins along with the signature long white banner fin that can extend out past the caudal fin (tail fin). The body shape of this fish reminds us a little of the freshwater angelfish. Longfin Bannerfish mostly eat in the ocean, but will and should go after most foods offered. Try to feed them a varied diet of fresh meaty foods, frozen foods (thawed first) and a good quality and balanced flake food. They may also pick at algae growing on tank surfaces and live rock.