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Tuna

From Academic Kids

For other uses, see Tuna (disambiguation).
Tuna

Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Actinopterygii
Order:Perciformes
Family:Scombridae
Genus:Thunnus
Species

Thunnus alalunga
Thunnus albacares
Thunnus atlanticus
Thunnus maccoyii
Thunnus obesus
Thunnus orientalis
Thunnus thynnus
Thunnus tonggol

Tuna are several species of ocean-dwelling fish in the family Scombridae, mostly in the genus Thunnus. Tuna are fast swimmers and include several species that are warm-blooded. Unlike most ocean fish species, which have white flesh, the flesh of tuna is pink. This is because the tuna's blood has a higher oxygen carrying ability than other fish species. Some of the larger tuna species such as the bluefin tuna can raise their blood temperature above the water temperature with muscular activity. This enables them to live in cooler waters and survive a wider range of circumstances.

Tuna is a popular seafood. Some varieties of tuna, such as the bluefin, are claimed to be endangered because of overfishing, while others are part of well maintained fisheries, such as the bigeye or yellowfin.

Mercury levels are oftentimes relatively high in tuna, as they sit higher in the food chain. Because of this, the FDA in March 2004 issued guidelines recommending pregnant women, nursing mothers and children should limit their intake of tuna and certain other types of fish.

It is difficult to keep tuna in a captive environment; Monterey Bay Aquarium is one of the few aquariums in the world that successfully keep tuna in display.

Types include:

Tuna are a common target for big-game fishing, and are mostly caught on artificial lures.

Other species

Species of several other genera (all in Scombridae) are commonly named "tuna":

Trivia

In Japan, a railway roadkill is sometimes referred as "tuna". Because the dead body's head and feet are chopped off by the train, it looks like a piece of frozen tuna in a fish market (the tail of a tuna is frequently chopped off to examine its fat content).

External links

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es:Atn fr:Thon ja:マグロ pl:Tuńczyki pt:Atum sv:Tonfiskslktet zh:鮪魚

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