Pacific bluefin tuna (Thunnus orientalis)

The Pacific bluefin is one of the largest of the tuna species (80–200 cm length), although it is generally smaller than the Atlantic bluefin tuna, with which it is closely related. Of the tunas, Pacific bluefin has the largest geographic range; it is primarily found in the North Pacific, from the East Asian coast to the western coast of North America. Although it is mainly a temperate water species, it also tolerates tropical waters and seasonally comes close to the shore. This species is considered to consist of only one stock and it forms schools by size, sometimes with other mackerel and tuna species.

See also Temperate tuna species.

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