Hardhead sea catfish
(Ariopsis felis)

The hardhead catfish (Ariopsis felis) is a species of sea catfish from the northwest Atlantic and Gulf of Mexico, and similar to the gafftopsail catfish (Bagre marinus). It is one of four species in the genus Ariopsis. The common name, hardhead catfish, is derived from the presence of a hard, bony plate extending rearward toward the dorsal fin from a line between the catfishs eyes. They are often a dirty gray color on top, with white undersides.

It is an elongated marine catfish that reaches up to 28 in (70 cm) in length and 12 lb (5.5 kg) in weight. Their typical weight is less than 1 lb (450 g), but they commonly reach up to 3 lb (1.4 kg).

Hardhead catfish are found mostly in the near-shore waters of the Western Atlantic Ocean, around the southeast coast of the United States, around the Florida Keys and the coast of the Gulf of Mexico. Hardhead catfish are also found in brackish estuaries and river mouths where the bottom is sandy or muddy, but only occasionally enter freshwater. It tends to move from shallower to deeper waters in the winter months. The species is generally common to abundant within its range.

The hardhead catfish has four barbels under the chin, with two more at the corners of the mouth. These barbels help the catfish find crabs, fish, and shrimp in the muddy bays where they live. The dorsal and pectoral fins each are supported by a sharp, slime-covered, barbed spine. The dorsal spine is normally erect when the fish is excited and a tennis shoe or even a leather-soled shoe offers little protection. The gafftopsail catfish looks similar to the hardhead catfish, but its dorsal and pectoral spines have a distinctive fleshy extension (like the fore-and-aft topsail of a ship).