Tuna are powerful, sleek, muscular, pelagic fish, with streamlined fins and scales, and torpedo-like bodies that propel them through the ocean at high speeds and for great distances. Tuna are a popular fish, consumed either cooked, as canned tuna and tuna steak, or raw, as sushi and sashimi. Tuna are vital elements in marine ecosystems, as both predator and prey, but many tuna fisheries are under threat or have collapsed from overfishing. As apex predators, tuna flesh contains high levels of mercury and organic pollutants. Eating canned tuna fished by purse seine may contribute to the death of dolphin calves.

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