Also known as Flagfin Prawngoby, Gudgeon, Prawn Goby, Shrimp Goby, Smiling Goby, Smiling Shrimpgoby.
Found singly or in pairs sharing their burrow with a mottled brown alpheid shrimp over mud and sand bottoms of shallow silty estuaries, and coastal slopes.
They feed on benthic crustaceans and zooplankton.
Length - 8cm
Depth - 5-25m
Shrimp Gobies live a symbiotic relationship with snapping shrimps.
The Gobies stand guard while the shrimps play "housekeeper" to their burrow, continually digging and cleaning the sand. The Gobies will signal when predators are near. Ref: https://www.fishbase.se/summary/Mahidolia-mystacina.html