Common in the Solitary Islands Marine Park. Known from the Western Pacific region. In Australia recorded from southern Queensland, south through New South Wales and eastern Victoria, and including north east Tasmania.
Frequents harbours, estuaries and lower reaches of freshwater streams, usually on rocky reefs or pylons in small aggregations.
Pale brown with dark brown chequered pattern to the rear of the body, mature males have dark blotch on first dorsal fin and enlarged mouth. A small species that lives amongst algae and rubble on the substrate. May sometimes be seen feeding in the water column just above the bottom. Grows to around 5 cm.
Kuiter, R. H., Coastal Fishes of South-Eastern Australia. Published by Crawford House Press Pty. Ltd., 1993. p.357.
Atlas of Living Australia website at https://bie.ala.org.au/search?q=Redigobius+macrostoma. Accessed 05/07/18.
FishBase. Froese, R. and D. Pauly. Editors. 2018. World Wide Web electronic publication. https://fishbase.ca/summary/redigobius-macrostoma.html. Accessed 05/07/18.