![]() ![]() North Pacific albacore migrate to two regions of the Northeast Pacific: one off the northern part of Baja California, Mexico, and the other off the coasts of Washington and Oregon. Migration Ī highly migratory species, schools of albacore travel great distances, though Atlantic and Pacific populations do not appear to mix. It favors areas where warm and cool water mix. ![]() It can survive at temperatures as low as 9.5 ☌ (49.1 ☏) for short periods of time. It is most often found in surface waters 15.6–19.4 ☌ (60.1–66.9 ☏) in temperature, though larger individuals can be found in deeper waters 13.5–25.2 ☌ (56.3–77.4 ☏). Its depth range is 0–600 m (0–1,969 ft 0–328 fathoms) in the epipelagic and mesopelagic zones. ![]() Its latitudinal range extends from 59°N to 46°S. The albacore has a cosmopolitan distribution in tropical and temperate waters across the globe and in every ocean as well as the Mediterranean Sea. Males and females exhibit no sexual dimorphism. It reaches sexual maturity at 0.9 m (2 ft 11 in) and its common length is only slightly larger at 1.0 m (3 ft 3 in). At 1.4 m (4 ft 7 in) maximum length, the albacore is the smallest of the bluefin tuna. It has 7–9 dorsal finlets and 7–8 anal finlets, dark blue and silvery white in color respectively, matching the part of the fish's body they are on. The first dorsal fin is a deep yellow and the second, which is smaller than the first, is a light yellow, as is the anal fin. obesus juveniles, which also have long pectoral fins, though these are rounded at the tips where the albacore's taper to a point. They are markedly shorter in fish under 0.5 m (1 ft 8 in) in length, often resulting in confusion with T. Like the fish's body, the fins are dark blue on top, but change to a medium yellow color on the underside. The pectoral fins begin slightly before the first dorsal fin and extend well beyond the front of the anal fin, usually as far as the second dorsal finlet, often as long as 30% of the fish's total length. Its body is dark blue dorsally, shades of silvery white ventrally, and covered by small scales. The albacore has a streamlined, fusiform body with a conical snout, large mouth, and big eyes. Description The albacore's pectoral fins can be longer than 30% of the fish's total length. Populations of albacore differ genetically by region, with Atlantic, Pacific, and Mediterranean groups each showing differences in mitochondrial and nuclear DNA. It is a member of the Thunnus subgenus, also known as the bluefin group. It was assigned to the genus Thunnus by ichthyologists Bruce B. He originally placed it in the mackerel genus Scomber. The first scientific description of the albacore was authored in 1788 by Pierre Joseph Bonnaterre in the illustrated encyclopedia Tableau encyclopédique et methodique des trois règnes de la nature. Phylogenetic tree of genus Thunnus with yellowfin group in green. Several stocks were in significant decline and the species' overall population were decreasing but are now recovering thanks to the enforcement of regional fishing quotas. It was listed as Near Threatened by the International Union for Conservation of Nature (IUCN) because of the threat of overfishing but is now Least Concern again. It was originally the basis for the United States tuna-canning industry and is no less important today, making up significant percentages of the gross domestic products of various Pacific nations. The albacore is a very economically important fish and is a target of commercial and recreational fisheries. Once grown, schools are highly migratory. Albacore form schools based on their stage in the life cycle, but also combine with other tuna like the skipjack tuna, yellowfin tuna, and bluefin tuna. Fry (juvenile fish) generally stay near where they were spawned for about a year before moving on. An adult female can release over two million eggs in a single cycle. Reproduction usually occurs from November to February and is oviparous. They are unique among most tuna in that their primary food source is cephalopods, with fish making up a much smaller portion of their diet. Individuals can reach up to 1.4 m (4 ft 7 in) in length.Īlbacore are pelagic predators that eat a wide variety of foods, including but not limited to fish, crustaceans, and cephalopods. Its body is a deep blue dorsally and shades of silvery white ventrally. The albacore has an elongate, fusiform body with a conical snout, large eyes, and remarkably long pectoral fins. There are six distinct stocks known globally in the Atlantic, Pacific, and Indian oceans, as well as the Mediterranean Sea. It is found in temperate and tropical waters across the globe in the epipelagic and mesopelagic zones. The albacore ( Thunnus alalunga), known also as the longfin tuna, is a species of tuna of the order Scombriformes. ![]()
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