Redspotted shrimpgoby

Geographical Origin and Habitat: This species is distributed in the Western Pacific, specifically the Ryukyu Islands, Ogasawara Islands (Japan), and along the eastern coast of northern Australia. It inhabits clean sandy slopes and rubble zones near coral reefs, at depths ranging from 20 to 35 meters.

Taxonomy and Morphology: Belongs to the family Gobiidae, genus Amblyeleotris. It features a slender, elongated body that can reach a maximum total length of approximately 10 cm. It has protruding eyes adapted for wide-angle vision and well-developed dorsal and anal fins.

Social Behavior: Lives in a close mutualistic symbiosis with Alpheus snapping shrimp. The goby stands guard at the entrance of the burrow, offering visual protection to the shrimp, which in return provides continuous excavation services. It is a peaceful, vigilant fish, ready to retreat at the first sign of danger.

Coloration and Sexual Dimorphism: Displays a cream or whitish body background crossed by five broad vertical brick-red or brown bands, finely outlined with small bright blue spots. A dark bar is present between the eye and the mouth. Sexual dimorphism is not highly pronounced.

Aquarium Setup: Requires an aquarium with a minimum capacity of 80-100 liters, featuring a deep sandy bed of at least 6-8 cm composed of fine sand mixed with small pieces of shells and coral rubble. This allows the goby and its associated shrimp to build stable and complex burrows.

Diet and Feeding: A carnivorous species. In captivity, feed high-quality small frozen foods such as brine shrimp, mysis, copepods, and finely chopped small crustaceans. It also readily accepts sinking dry granules or pellets that should be deposited near the entrance of the burrow.

Water Quality: Stable marine parameters are required: temperature 23 to 26 °C, pH 8.1-8.4, specific gravity 1.020-1.025. Efficient filtration and regular water changes are crucial to keep nitrate levels low near the substrate, where the fish spends its entire life.

Compatibility and Cohabitation: Extremely peaceful and reef-safe. It can be housed with calm, non-aggressive reef species. Introducing it with a compatible snapping shrimp (such as Alpheus bellulus or Alpheus ochrostriatus) is highly recommended. Avoid large, predatory fish that could swallow it.

Aquarium Breeding: Captive breeding in home aquariums is not documented. Like other symbiotic gobies, they lay eggs inside their burrows where they are guarded by the parents. The larvae undergo a complex pelagic phase requiring microscopic live food cultures (rotifers/phytoplankton).

Risks and Diseases: The main risk is the collapse of rockwork if it is not placed securely on the glass bottom of the aquarium (the shrimp excavates continuously under rocks). They can jump when startled, so a tight-fitting cover is necessary. Otherwise, they are hardy.