Tuna

Tuna are several species of ocean-dwelling fish in the family Scombridae. Tuna are fast swimmers and like most other fish species are cold-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. Though not really warm-blooded, this enables them to live in cooler waters and survive a wider range of circumstances.

Tuna is a popular seafood. It is endangered because of overfishing.

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:

• bluefin tuna, which can grow to 1,500 lb (680 kg).
• yellow fin tuna

In Polynesian mythology, Tuna is the god of eels who was sentenced to be executed (by the Upolo) after trying to rape Sina (who had grown him in a jar). He asked that his head be buried in the sand and from it, the first coconut grew. He was Hina's lover.