A large craft used for tuna fishing on the Pacific coast; it is usually diesel-powered, and is equipped with refrigeration brine tanks. Also known as tuna boat.

Tuna are several species of ocean-dwelling fish in the family Scombridae, mostly in the genus Thunnus. Some tuna are able to inhabit freshwater environs as well. Tunas are fast swimmers—have been clocked at 77 km/h (48 mph)—and include several species that are warm-blooded. Unlike most fish species, which have white flesh, the flesh of tuna is pink to dark red. This is because tuna muscle tissue contains greater quantities of myoglobin, an oxygen-binding molecule. 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. Some tuna species and fisheries are overfished and there are risks of some tuna fisheries collapsing.

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