Common name: Miller's damsel

General information

The Gunmetal Goby, scientifically known as Asterropteryx ensifera, is a small and peaceful fish that is well-suited for reef aquariums. This species is known for its distinctive gunmetal blue to grey coloration with a black spot on the dorsal fin and a black-edged anal fin. They typically reach a size of around 3.5 centimeters (1.4 inches) in length, making them a perfect choice for nano or larger community tanks.

Care

Gunmetal Gobies are relatively easy to care for but do require a well-established tank with plenty of live rock and sand substrate to mimic their natural habitat. They are shy and peaceful, making them suitable tank mates for other non-aggressive fish. A varied diet of small meaty foods such as brine shrimp, mysis shrimp, and finely chopped seafood is essential for their health.

Reproduction

In the wild, Asterropteryx ensifera is known to spawn in small crevices or under overhangs where they can protect their eggs. In the aquarium, breeding is possible but challenging due to their small size and the difficulty in raising the fry. The male typically guards the eggs until they hatch.

Habitat

The Gunmetal Goby is found in the Western Pacific, from Indonesia to the Solomon Islands, and as far north as the Ryukyu Islands. They inhabit shallow reefs and lagoons, often seen hovering above the bottom or resting on coral branches. They prefer areas with moderate to strong currents and are usually found at depths of 1 to 30 meters.