How to Identify Hornyhead Chub

To identify Hornyhead Chub (Nocomis biguttatus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically olive-brown to dark brown, fading to silvery-white on the belly. A prominent dark lateral stripe may be present, especially in juveniles, extending from the snout to the caudal fin base. Fins are generally dusky or yellowish. Breeding males develop a reddish-orange spot behind the eye and on the operculum, and their fins may become tinged with orange or red. The most distinctive feature in breeding males is the development of large, conical nuptial tubercles on the head, particularly on the snout and forehead.

Scale type

cycloid

Mouth position

subterminal

Distinctive features

Large, conical nuptial tubercles on the head of breeding males., Reddish-orange spot behind the eye and on the operculum in breeding males., Relatively large head and mouth., Small barbel at each corner of the mouth (maxillary barbel).

Dorsal fin

Single dorsal fin, typically with 8 rays. Origin is usually slightly anterior to the pelvic fin origin.

Tail fin

Moderately forked caudal fin.

Pectoral fin

Pectoral fins are relatively large and rounded.

Distinctive fins

All fins are typically rounded to slightly pointed, not sharply angular.

Identification Tips

1. 1

   Nuptial Tubercles

   Look for prominent, conical, horn-like projections on the head of males, especially during the breeding season (spring/early summer). These are absent or greatly reduced in females and non-breeding males.

2. 2

   Maxillary Barbels

   Observe for a small, fleshy barbel at each corner of the mouth. This is a key characteristic of the genus Nocomis.

3. 3

   Coloration

   Note the olive-brown back, silvery belly, and potential reddish-orange spot behind the eye in breeding individuals. A dark lateral stripe is often visible, particularly in younger fish.

4. 4

   Habitat Preference

   If found in clear, gravel-bottomed streams with moderate current, it increases the likelihood of it being a Hornyhead Chub.

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