How to Identify Brown Bullhead

To identify Brown Bullhead (Ameiurus nebulosus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Typically mottled brown to yellowish-brown on the back and sides, fading to a lighter, often yellowish or whitish belly. The mottling can be quite variable, sometimes appearing almost black or olive. Juveniles are often darker.

Scale type

none

Mouth position

terminal

Distinctive features

Four pairs of barbels around the mouth (two nasal, two maxillary, two mental, two mandibular)., Smooth, scaleless skin., Adipose fin present., Slightly emarginate (not deeply forked) caudal fin., Serrated spines on the leading edge of the dorsal and pectoral fins.

Dorsal fin

Single dorsal fin with a stout, serrated spine and 6-7 soft rays. The spine is venomous.

Tail fin

Caudal fin is slightly emarginate to nearly square, not deeply forked.

Pectoral fin

Pectoral fins each have a stout, serrated spine and 8-9 soft rays. The spine is venomous.

Distinctive fins

Adipose fin is present, small, and fleshy. Anal fin is long with 20-24 rays.

Identification Tips

1. 1

   Caudal Fin

   The caudal (tail) fin is slightly emarginate (not deeply forked), which distinguishes it from the Channel Catfish (Ictalurus punctatus) which has a deeply forked tail.

2. 2

   Barbels

   All barbels are dark, typically black or dark brown, matching the body coloration. This contrasts with the Yellow Bullhead (Ameiurus natalis) which has white or yellowish chin barbels.

3. 3

   Pectoral Spines

   The pectoral fin spines are strongly serrated along their posterior edge, which can be felt by gently running a finger along the spine. These spines are venomous.

4. 4

   Body Coloration

   Mottled brown to yellowish-brown body, often with darker blotches. The belly is typically lighter. Coloration can vary significantly with habitat.

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