Diagnosis_Genus: Thunnus South 1845.

Diagnosis_Species: Scomber albacares Bonnatere 1788. L'Albacoke g. s. Albacares S. pïnmdh plurimis : ariflis duabus fiipra opercula, memhranà lucuiâ tecl; s.Several false fins: two ridges covered with a shining skin, above the opercuies. The body is round and entirely covered with small scales:The jaws, the length of which is about six inches, are armed with a single row of short and very sharp teeth.The fins of the back correspond to those of the belly; It is accompanied by several false fins, distant one from the other, about two inches; The fin Of the anus is one foot long by three inches wide; It ends in a point; That of the tail is indented crescent: the lateral parts of the tail form,on the other hand, a fault in a hull, which is three-quarters of an inch in elevation. Some parts of the body are white; The others are of a dark color. This fish has three feet Circumference in its greatest thickness, and five feet in length. S / oa, ie, Hijl. Tho.Jamaïc. flight. 2 p. 11. Jamaica. Species that have false fins united with each other.

Other description (WildscreenArkive): The yellowfin tuna (Thunnus albacares) is a fish built for speed and endurance. Its streamlined body is metallic dark blue on the back, blending into yellow or silver on the belly. The belly is patterned with numerous broken lines, and a vivid golden stripe runs along each side of the body, from the eye to the tail. The yellowfin tuna has two dorsal fins, the second one of which can be very long and is situated directly over the long anal fin. The pectoral fins, those found on each side of the body, are also long, often reaching beyond the space between the two dorsal fins. The fins can be retracted so that water flows even more smoothly over its body when swimming. Tiny fins, (or finlets), run down the top and bottom side of the body, from the second dorsal fin and the anal fin to the tail. These finlets, along with the dorsal and anal fins, are bright yellow, giving this fish its common name. The finlets are bordered by a narrow black band.

Other description (FishBase): Dorsal spines (total): 11 - 14; Dorsal soft rays (total): 12-16; Anal spines: 0; Anal soft rays: 11 - 16; Vertebrae: 39. Fish with very long second dorsal fin and anal fin, which in some may reach well over 20% of the FL. The pectoral fin is moderately long, usually reaching beyond the second dorsal fin origin but not beyond the end of its base. Color is black metallic dark blue changing through yellow to silver on the belly. The belly frequently has about 20 broken, nearly vertical lines. The dorsal and anal fins and finlets are bright yellow.

Body_adult_length:78 - 158 cm
Body_adult_male_max_length: 239 cm
Body_adult_male_common_length: 150 cm
Weight_adults: 200.0 kg
Weight_adults_max: 400kg (WildscreenArkive)