tuna

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tuna

or

tunny,

game and food fishes, the largest members of the family Scombridae (mackerelmackerel,
common name for members of the family Scombridae, open-sea fishes including the albacore, bonito, and tuna. They are characterized by deeply forked tails that narrow greatly where they join the body; small finlets behind both the dorsal and the anal fins; and sleek,
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 family) and closely related to the albacore and bonito. They have streamlined bodies with two fins, and five or more finlets on the back. The body is very narrow in the tail region, and the tail is deeply forked.

The most important commercially of the group called little tunnies is the little tuna, or false albacore, Euthynnus alleteraturs, which averages 10 lb (4.5 kg) and is found in open Atlantic waters north to Cape Cod. The oceanic bonito, or skipjack, Katsuwonus pelamis, is a warm-water fish reaching 20 lb (9 kg) in weight. The albacore, or long-finned tuna, Thunnus alalunga (up to 60 lb/27 kg), is found in tropical and temperate ocean waters (including the Mediterranean); its flesh is marketed as "whitemeat tuna." The Atlantic bluefin tuna, T. thynnus, the largest of the great tunnies and the giant of bony fishes, averages 200 to 500 lb (90–225 kg) with adults sometimes reaching 14 ft (427 cm) and 3-4 tons (680 kg). The Pacific bluefin tuna, T. orientalis, of similar size, and the Altantic are sometimes treated as subspecies of the northern bluefin; both are found in the Northern Hemisphere. The southern bluefin, of the same genus but a little smaller, is found in the Southern Hemisphere. Bluefin are highly prized as sport fishes as well as by commerce. The yellowfin tuna, T. albacares, is smaller (125 lb/56 kg) and found in tropical and subtropical open ocean waters worldwide.

Tuna fisheries have been important commercially in Europe for centuries and are the backbone of a major canning industry on both coasts of North America. Tuna fishing is controlled by international agreements, but catch limits and other regulations have not been adhered to. As a result, some tuna fisheries have been overfished, and the albacore, bluefin, yellowfin, and other species are considered threatened. Another major marine conservation problem has been the use of huge drift nets to capture tuna, because the nets also trap and kill thousands of seals, dolphins, whales, and sea birds in the process. Although nets longer than 1.5 mi (2.4 km) have been banned worldwide, nets up to 20 mi (32 km) are still commonly used in defiance of the ban in parts of the world.

Tunas are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Actinopterygii, order Perciformes, family Scombridae.

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tuna

[′tü·nə]
(vertebrate zoology)
Any of the large, pelagic, cosmopolitan marine fishes which form the family Thunnidae including species that rank among the most valuable of food and game fish.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

tuna

1
1. any of various large marine spiny-finned fishes of the genus Thunnus, esp T. thynnus, chiefly of warm waters: family Scombridae. They have a spindle-shaped body and widely forked tail, and are important food fishes
2. any of various similar and related fishes

tuna

2
1. any of various tropical American prickly pear cacti, esp Opuntia tuna, that are cultivated for their sweet edible fruits
2. the fruit of any of these cacti
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
On Saturday morning, about 70 boats carrying recreational anglers left Skagen at the northern tip of Jutland to help DTU researchers tag bluefin tuna on day one of this year's tagging project.
The three major tuna processing plants set up on the sandy islands provide employment opportunities to many locals.
Owing to the high mercury content in some samples, the team recommended that health agencies consider adding bigeye and bluefin tuna to lists of fish that should be avoided by especially vulnerable groups such as young children and pregnant or nursing women.
Australia would prefer a CITES Appendix II listing, which would see international trade in Atlantic bluefin tuna closely monitored and regulated.
The plan could lead some 1,000 Japanese people to lose jobs and bring about higher tuna prices in Japan.
The ICCAT last year recommended China's tuna fishing quota be set at 4,000 tons for 2001, down from 7,300 tons the previous year.
An adult bluefin tuna may be the most valuable animal, pound for pound, on the planet.
Yellowfin and bigeye tuna have traditionally been landed combined and recorded in U.S.
Atlantic bluefin tuna is facing a rapid decline in stocks due to reckless fishing.
The Inter-American Tropical Tuna Commission (IATTC) was established by an international convention in 1950 and is responsible for the conservation of tunas and management of fisheries for tunas and other species taken by tuna-fishing vessels in the eastern Pacific Ocean (EPO).