Smallmouth Hardyhead

Atherinosoma microstoma

Atherinosoma microstoma - Smallmouth Hardyhead
image_search Terms and anatomy

Size: 10 cm

Distribution: All SA coastal and gulf waters

Habitat: Estuaries

Depth: Shallow subtidal to 2m

Common in marine and estuarine environments, and also seen in fresh water, this small silvery fish is often found in schools. As its common name suggests, it has a tiny mouth, but also has a distinct mid-body stripe and its two dorsal fins are widely spaced. It is extremely difficult to distinguish from other atherinids, except during breeding season, where the eyes and mid-body stripe turn bright orange in males.

Further Reference

Fishes of Australia