The bigeye tuna – thunnus obesus – is “a large, fast-swimming species with a metallic-colored, streamlined body.”(1) It can be distinguished by its color scheme, which features yellow accents: a deep yellow first dorsal fin, a pale yellow second dorsal and anal fin, and bright yellow finlets.
This tuna also stands out due to its weight and large head and eyes.
The bigeye are closely related to the yellowfin tuna, but may be recognized by its plump body, its larger head, and its really big eyes. They’re found in the Atlantic, Pacific, and Indian oceans in warmer temperature waters between 55 and 84º F. In the western Atlantic, they can be found from Nova Scotia to Argentina, including the Caribbean and the Gulf of Mexico and they are found from the surface to about 800 feet deep. Bigeye typically range in length from 1.5 to 5.5 feet, yet ones over 6.5 feet are rare.
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