How to Identify Hardhead Catfish

To identify Hardhead Catfish (Ariopsis felis), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically dark gray to bluish-black, fading to silvery-white on the flanks and belly. Fins are often dusky.

Scale type

none

Mouth position

subterminal

Distinctive features

Scaleless body, Three pairs of barbels around the mouth (one maxillary pair, two mandibular pairs), Adipose fin absent, Strong, serrated, venomous spines on the dorsal and pectoral fins, A bony plate on the top of the head, giving it the 'hardhead' name

Dorsal fin

Single, tall dorsal fin with a strong, serrated spine followed by 7 soft rays. The spine is venomous.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Large, fan-like pectoral fins, each with a strong, serrated spine followed by 10-11 soft rays. These spines are also venomous.

Distinctive fins

No adipose fin. Pelvic fins are abdominal.

Identification Tips

1. 1

   Barbels

   Possesses three pairs of barbels: one long maxillary pair extending beyond the pectoral fins, and two shorter mandibular pairs on the chin. This distinguishes it from the Gafftopsail Catfish (Bagre marinus) which has only two pairs of barbels, with the maxillary barbels being extremely long and filamentous.

2. 2

   Dorsal Fin

   The dorsal fin is tall and triangular, with a prominent, serrated spine. Unlike the Gafftopsail Catfish, it lacks the elongated, filamentous extension on the dorsal fin spine.

3. 3

   Adipose Fin

   Hardhead Catfish lack an adipose fin, a small fleshy fin found between the dorsal and caudal fins in some other catfish species.

4. 4

   Head Shape

   The head is relatively broad and flattened dorsally, with a distinct bony plate visible on the top of the skull.

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