Agosia chrysogaster Girard, 1856
Longfin dace
Agosia chrysogaster
photo by The Native Fish Conservancy

Family:  Leuciscidae (Minnows), subfamily: Pogonichthyinae
Max. size:  10 cm TL (male/unsexed)
Environment:  demersal; freshwater
Distribution:  North America: lower Colorado River drainage (primarily Gila and Bill William River systems) in New Mexico and Arizona, USA and south through southern Arizona and Pacific drainages of Mexico.
Diagnosis:  Anal soft rays: 7-7. Agosia chrysogaster can be distinguished by its elongated lower lobe on anal fin in large female, 70-95 small lateral scales, small barbell at corner of mouth, long coiled intestine, black peritoneum, rounded snout, slightly subterminal mouth, dorsal fin origin above or slightly in front of pelvic fin origin, 7 anal rays, pharyngeal teeth 0,4-4.0. Color consists of dark gray above, dusky black band along silver side enlarged into black spot at caudal fin base, often gold flecks on side. Large male is light yellow below, with yellow paired fin bases, large dorsal fin (Ref. 86798).
Biology:  Inhabits shallow sandy and rocky runs, flowing pools of creeks and small to medium rivers. Often occurs near cover (Ref. 86798).
IUCN Red List Status: Least Concern (LC); Date assessed: 16 October 2018 Ref. (123251)
Threat to humans:  harmless
Country info:   

Entered by: Froese, Rainer - 01.05.91
Modified by: Torres, Armi G. - 27.06.15
Checked by: Torres, Armi G. - 12.05.94

Source and more info: For personal, classroom, and other internal use only. Not for publication.

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