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Big Eye Tuna

The bigeye tuna, unlike other tunas, is a large, fast-swimming species with a metallic-colored, streamlined body. This species is dark metallic blue on the back and upper sides with white lower sides and belly.

 The first dorsal fin is deep yellow, the second dorsal and anal find are pale yellow, and the finlets are bright yellow with black edges. Although most of the tunas are difficult to distinguish, the bigeye tuna may be recognized by a combination of severa characteristics: the coloration of the finlets, the 23 to 31 gill rakers on the first arch, a prominenet lateral keel on the caudal peduncle located between two smaller ones and a liver with a striated ventral surface.