Gila nigrescens (Girard 1856)

Gila nigrescens can be distinguished by the following characters: lateral line with 67-78 scales; dorsal fin with 9 rays; anal fin with 8 rays; 1st gill arch with 9014 rakers; pharyngeal teeth 2,5-4,2; deep, compressed body; long, fairly slender caudal peduncle; terminal mouth on rounded snout; olive-gray above; silver side; clear to slate gray fins; and breeding individuals with red-orange mouth and paired and anal-fin bases (Ref. 86798).

Dorsal soft rays (total): 9; Analsoft rays: 8

Inhabits flowing pools of creeks and small rivers, usually near brush or other cover (Ref. 86798).

The Chihuahua chub (Gila nigrescens) is a species of ray-finned fish in the family Cyprinidae. It is found in Chihuahua, Mexico and in New Mexico, United States. The males can reach 24 cm (9.5 in) in length.