How to Identify Eel-tailed Catfish

To identify Eel-tailed Catfish (Neosilurus hyrtlii), look at these key features.

Physical Characteristics

Body shape

eel-like

Coloration

Generally dark grey to olive-brown on the dorsal surface, fading to a lighter grey or whitish on the ventral side. Fins are typically dark, sometimes with lighter margins. Coloration can vary slightly depending on habitat and substrate.

Scale type

none

Mouth position

terminal

Distinctive features

Elongated, cylindrical body, tapering towards the tail., Continuous dorsal, caudal, and anal fin, giving an eel-like appearance., Four pairs of barbels around the mouth (one nasal, one maxillary, two mental)., Small, deeply embedded eyes., Smooth, scaleless skin.

Dorsal fin

Single, long dorsal fin that is continuous with the caudal and anal fins. Originates anterior to the midpoint of the body.

Tail fin

Rounded, continuous with the dorsal and anal fins.

Pectoral fin

Relatively small, fan-shaped, located just behind the gill covers. Possesses a strong, serrated spine.

Distinctive fins

The most distinctive feature is the continuous median fin (dorsal-caudal-anal), which is characteristic of the Plotosidae family, though Neosilurus is in the Ariidae family, it shares this convergent evolution with some plotosids. The pectoral fins have a sharp, venomous spine.

Identification Tips

1. 1

   Body Shape

   Look for the distinctly elongated, eel-like body that tapers towards the tail.

2. 2

   Fin Structure

   Observe the continuous median fin, where the dorsal, caudal, and anal fins are fused into a single, undulating structure.

3. 3

   Barbels

   Count the four pairs of barbels around the mouth, which are sensory organs used for foraging.

4. 4

   Coloration

   Note the generally dark grey to olive-brown dorsal coloration, lightening ventrally.

5. 5

   Pectoral Spines

   Be aware of the presence of strong, serrated spines in the pectoral fins, which are venomous.

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