Longfin Dace

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).

Analsoft rays: 7

Inhabits shallow sandy and rocky runs, flowing pools of creeks and small to medium rivers. Often occurs near cover (Ref. 86798).

The longfin dace (Agosia chrysogaster) is a leuciscid fish that is found in western North America in the United States and Mexico. It is the only member of its genus. The Gila longfin dace is considered the nominate subspecies. The Yaqui longfin dace is considered a form.