Description
The largest mackerel scad recorded was 46 cm long. Their elongated bodies look somewhat circular when viewed head on. They are distinguishable by a small, detached fin, located between the dorsal and caudal fins. Mackerel scad have 9 spines and 31-36 rays on their dorsal fins, while there are seven spines and 27-30 rays on their anal fins.
The mackerel scad's fins are black metallic to blue-green and its belly is white. The edge of the operculum has a small, black spot, with no spots on the lateral line. Mackerel scad's caudal fins have been described as reddish to yellow-green.
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“The next Augustan age will dawn on the other side of the Atlantic. There will, perhaps, be a Thucydides at Boston, a Xenophon at New York, and, in time, a Virgil at Mexico, and a Newton at Peru. At last, some curious traveller from Lima will visit England and give a description of the ruins of St. Paul’s, like the editions of Balbec and Palmyra.”
—Horace Walpole (1717–1797)