Diagnosis_genus: Caranx Lacépède. Two dorsal fins; no small fins above or below the tail; the sides of the tail lengthwise statements keel, or a small fin composed with two stings and a membrane in front of the anal fin.

Diagnosis_species: Scomber Crysos Mitchill. Yellow Mackerel. Length six inches and a half; depth two. A neat, compact, hand fish, about three quarters of an inch thick. He is plump and smooth generally. Back forms a neat regular curve. Belly an apposite corresponding sweep. Head neither rostrated nor blunt. Tail very slender, and ending in a fin deeply forked. A marine fish, taken in the bay of New-York. Lateral line bends upward about the thorax; then turns downward and runs straight to the middle of the tail. Soon after its curvature it becomes mailed and spinous. The spines are short, and directed backward. They are sharper and larger, and their bases wider as they approach the tail. Thus the line itself widens in its course backward. Mouth moderate. Lower jaw rather thin and small. Teeth minute, and may be said to be rather adapted to hold fast than to bite. Eyes yellow, and rather large. A black spot frequently at the edge of the gill-cover. Two dorsal fins, the foremost of which is spinous, and occupies but little space. In front of it, a spine pointing forward. The hinder dorsal filamentous, and continued almost to the tail. Two spines just behind the vent, and from them the ventral fin extends almost to the caudal. A bony ridge reaching from the upper part of the nose to the first spine of the back. Pectoral fins pointed; ventrals small. Colour of the back greenish blue, with a yellow suffusion. Yellow gilds the gill-covers, sides, and belly. The same golden hue also tinges the second dorsal, caudal, anal, pectoral, and ventral fins, in varying shades. The chin and gill-covers are whitened a little, and white likewise appears a little along the belly. Tongue yellow, and rather rough. Scales few, and easily deciduous. No zones, stripes, or spots any where about him; nor any spurious fins. But a sort of second lateral line near the roots of the dorsal fins, on each side of the back. Rays, Br. 7. D. 8-24. A. 19. P18. V. 4. C.18.
Body_length: 40-70 cm
Body_length_maturity: 26.7 cm (Florida), 22.5 cm (Louisiana), 26cm (Jamaica) (Goodwin and Finucane, 1985)
Max_weight: 5.1 kg