Whitecap Shrimpgoby

Found singly, or in pairs, waving their pectoral fins, and sharing their burrow, with the alpheid shrimp - Alpheus rubromaculatus, over shaded rubble, and sand bottoms, of coastal and outer reefs.

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.