Southwestern Distribution
The range includes the Gila and Bill Williams systems and extends through southern Arizona into Pacific-draining Mexican waters. A precise basin is useful within this broad desert-region distribution. Similar regional habitat does not identify every small minnow as Agosia chrysogaster.
Current and Cover
Adults occupy sandy and rocky runs and flowing pools in creeks and small to medium rivers. Cover is often nearby. The word pool therefore should not automatically be translated into stagnant water, especially when the record describes visible current.
Size and Observation
The compiled maximum is ten centimeters total length. Photographs should retain the full body, head and fins for comparison with other southwestern minnows. Record the substrate and nearby shelter as well as the stream name to preserve the actual conditions occupied by the fish.
Describe Flow Through the Pool
A pool can carry substantial current. Preserve that observation instead of assuming every pool record represents still-water habitat.
All Lakes With Longfin Dace
Browse lakes and reservoirs with documented Longfin Dace records, listed alphabetically. Records do not establish current abundance or public access. Check the evidence and managing authority for the water you choose.
No published lakes are currently linked to this species in our confirmed records.