How to Identify Tadpole Madtom

To identify Tadpole Madtom (Varies depending on the species), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Typically olive to dark brown on the dorsal surface, fading to a lighter, yellowish or whitish belly. May have faint mottling or darker saddles along the back. Fins are often dusky.

Scale type

none

Mouth position

terminal

Distinctive features

Stout, 'tadpole-like' body shape, particularly in juveniles., Small, dorsally located eyes., Adipose fin broadly joined to the caudal fin, forming a continuous fin margin., Four pairs of barbels around the mouth., Venomous spines in the dorsal and pectoral fins.

Dorsal fin

Single dorsal fin with a strong, serrated spine and 6-7 soft rays. The adipose fin is long and low, broadly connected to the caudal fin.

Tail fin

Rounded to slightly emarginate, continuous with the adipose fin.

Pectoral fin

Pectoral fins with a strong, serrated spine and 7-9 soft rays.

Distinctive fins

Pelvic fins are small, abdominal. Anal fin is long with 15-20 rays.

Identification Tips

1. 1

   Body Shape

   Look for the characteristic stout, somewhat flattened body that gives it a 'tadpole-like' appearance, especially when young.

2. 2

   Adipose Fin

   The adipose fin is broadly connected to the caudal (tail) fin, forming a continuous fin structure along the posterior dorsal margin. This is a key distinguishing feature from many other catfish.

3. 3

   Coloration

   Observe the generally uniform olive to dark brown coloration on the back, fading to a lighter belly, often without prominent markings except for occasional faint mottling.

4. 4

   Size

   Adults are small, typically reaching 3-5 inches (7.5-12.5 cm) in total length.

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