Fan Shrimpgoby

Tomiyamichthys latruncularius

The Fan Shrimpgoby is a reef-associated fish found in tropical waters of the Indo-West Pacific, ranging from the Red Sea to Java and the Great Barrier Reef. It inhabits open sand and rubble areas adjacent to reefs, typically at depths between 2 and 45 meters. This goby species reaches a maximum length of 10 cm and is characterized by its slender, elongated body with a white base color. Distinctive markings include 3-4 large brown blotches on its sides and smaller brown blotches on its back. The head features brown-edged orange spots, and males develop filaments on the large first dorsal fin. The pelvic fins are united medially, and the caudal fin is asymmetrically rounded, about equal to the head length. The Fan Shrimpgoby is known for its symbiotic relationship with the snapping shrimp Alpheus randalli. This partnership is a classic example of mutualism in marine environments, where the goby provides a watchful eye for predators while the shrimp maintains the shared burrow. Divers encountering the Fan Shrimpgoby can expect to find it in sandy-bottomed areas near reefs, often hovering near its burrow entrance. It is considered harmless to humans and is currently listed as Least Concern by the IUCN.