How to Identify Gafftopsail Catfish

To identify Gafftopsail Catfish (Bagre marinus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

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

Scale type

none

Mouth position

terminal

Distinctive features

Two prominent, long, ribbon-like extensions on the dorsal and pectoral fins, which can be as long as the body in juveniles and sub-adults, shortening relatively with age., A pair of maxillary barbels (whiskers) that are long and extend beyond the pectoral fins., A pair of shorter mandibular barbels., Absence of scales (typical for catfish)., Adipose fin is absent.

Dorsal fin

Single, tall, sail-like dorsal fin with a strong, serrated spine and a very long, filamentous extension. Typically 1 spine and 7 soft rays.

Tail fin

Deeply forked caudal fin.

Pectoral fin

Large, fan-like pectoral fins, each with a strong, serrated spine and a very long, filamentous extension. Typically 1 spine and 10-11 soft rays.

Distinctive fins

The elongated filaments on the dorsal and pectoral fins are the most distinctive feature, giving the fish its 'gafftopsail' name. Pelvic fins are abdominal, and the anal fin is relatively long with 18-23 soft rays.

Identification Tips

1. 1

   Dorsal and Pectoral Fin Filaments

   Look for the extremely long, ribbon-like extensions on the first dorsal fin and both pectoral fins. These are unique among common marine catfish in its range.

2. 2

   Barbels

   Observe the two very long maxillary barbels that extend well past the pectoral fins, and the two shorter mandibular barbels.

3. 3

   Body Coloration

   Note the dark gray to bluish-gray back and silvery-white belly.

4. 4

   Absence of Adipose Fin

   Unlike many freshwater catfish, Bagre marinus lacks an adipose fin.

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