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Tunas

Tuna
Tuna assortment.png
Tunas (from top): albacore, Atlantic bluefin, skipjack, yellowfin, bigeye
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Scombridae
Subfamily: Scombrinae
Tribe: Thunnini
Starks, 1910
Genera
This article is
one of a series on
Commercial fish
Blue walleye.jpg
Large pelagic
billfish, bonito
mackerel, salmon
shark, tuna

Forage
anchovy, herring
menhaden, sardine
shad, sprat

Demersal
cod, eel, flatfish
pollock, ray
Mixed
carp, tilapia
External video
Tuna pole and line fishing BBC Two
Tuna, light, canned in oil, drained solids
Nutritional value per 100 g (3.5 oz)
Energy 830 kJ (200 kcal)
0 g
8 g
29 g
Vitamins
Vitamin A equiv.
(3%)
23 μg
Choline
(6%)
29 mg
Vitamin D
(45%)
269 IU
Minerals
Calcium
(1%)
13 mg
Iron
(11%)
1.4 mg
Magnesium
(9%)
31 mg
Phosphorus
(44%)
311 mg
Potassium
(4%)
207 mg
Zinc
(9%)
0.9 mg
Other constituents
Water 60 g
Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database

A tuna is a saltwater fish that belongs to the tribe Thunnini, a sub-grouping of the mackerel family (Scombridae) – which together with the tunas, also includes the bonitos, mackerels, and Spanish mackerels. Thunnini comprises fifteen species across five genera, the sizes of which vary greatly, ranging from the bullet tuna (max. length: 50 cm (1.6 ft), weight: 1.8 kg (4 lb)) up to the Atlantic bluefin tuna (max. length: 4.6 m (15 ft), weight: 684 kg (1,508 lb)). The bluefin averages 2 m (6.6 ft), and is believed to live for up to 50 years.

Tuna and mackerel sharks are the only species of fish that can maintain a body temperature higher than that of the surrounding water. An active and agile predator, the tuna has a sleek, streamlined body, and is among the fastest-swimming pelagic fish – the yellowfin tuna, for example, is capable of speeds of up to 75 km/h (47 mph). Found in warm seas, it is extensively fished commercially, and is popular as a game fish. As a result of over-fishing, stocks of some tuna species such as the southern bluefin tuna have been reduced dangerously close to the point of extinction.

The term tuna ultimately derives from Thunnus, the Middle Latin form of the Ancient Greek: θύννος (thýnnos) "tunny-fish" – which is in turn derived from θύνω (thýnō), "rush, dart along".


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Wikipedia

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