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Yellowfin has a fusiform body, more stylised than red or bigeye tuna. Head and eyes are small, the second dorsal fin and the anal fin are the longest ones of all tuna. Their pectoral fins usually surpass the beginning of the second dorsal fin, but they don't go further the end of their base. They show dark blue and yellow lateral stripes on the dorsal area. The lower and ventral areas are silver grey and normally show chains of vertical stripes alternated with spots. The second dorsal fin and the anal fin are yellow.
Their meat is lighter than one of the striped tuna; it has great nutritional value and is economically very important to the canning industry. They prefer warm waters; they are plentiful in the tropical waters along the Atlantic. Youngest specimens usually form big schools near the surface, whereas the adult ones prefer depths, although they can be also seen near the surface. These schools usually mix with other species.