Black Ray Goby

The Black Ray Goby is a charming and diminutive shrimp goby that has become a favorite among nano reef enthusiasts and marine aquarists alike. This species is instantly recognizable by its bright golden-yellow head that contrasts sharply with its pale white to light gray body marked with thin horizontal dark stripes. The most distinctive feature is the prominent elongated black ray extending from the first dorsal fin, which gives the species its common name. This dramatic dorsal spine is thought to serve as a communication signal to its symbiotic pistol shrimp partner.

In the wild, Stonogobiops xanthorhinica inhabits sandy and rubble slopes adjacent to coral reefs throughout the western Pacific, typically at depths of 15 to 30 meters. Like other members of its genus, it forms an obligate symbiotic relationship with Alpheid pistol shrimp, most commonly species of the genus Alpheus. The goby stands guard at the entrance of the shared burrow, scanning for predators with its well-developed eyes, while the nearly blind shrimp excavates and maintains the living quarters. The shrimp maintains physical contact with the goby via its antennae, and the goby signals danger through specific body movements.

The Black Ray Goby is an ideal candidate for nano reef aquariums, thriving in tanks as small as 10 gallons. It requires a fine sand substrate of at least 2 inches depth for burrowing, and providing a compatible pistol shrimp will bring out the most natural and entertaining behaviors. This species is completely reef-safe and peaceful, posing no threat to corals or other invertebrates. It is a bottom-dwelling species that rarely ventures far from its burrow, making it compatible with most mid-water and upper-water column fish. A secure lid is recommended as even small gobies can jump when startled.