Common name: Volcano shrimpgoby

General information

The Rhyax Shrimpgoby, scientifically known as Amblyeleotris rhyax, is a captivating species of goby that is appreciated by aquarists for its unique behavior and appearance. This species is characterized by its elongated body, adorned with a pattern of orange and white stripes that run the length of its body, punctuated by a distinctive volcano-like orange mark on the first dorsal fin, which is the inspiration for its common name, Volcano Shrimpgoby.

Care

Rhyax Shrimpgobies are relatively hardy and suitable for most reef aquariums. They require a sandy substrate to construct burrows, which they use for shelter and protection. These gobies are peaceful and can be kept with a variety of other non-aggressive fish and invertebrates. They thrive on a diet of meaty foods such as brine shrimp, mysis shrimp, and finely chopped seafood.

Reproduction

In the wild, Rhyax Shrimpgobies are known to form monogamous pairs. They exhibit fascinating breeding behaviors, with the male guarding the eggs within the burrow until they hatch. In the aquarium, breeding is less common but can occur if the environment is stable and the pair is well-established.

Symbiosis

One of the most intriguing aspects of the Rhyax Shrimpgoby is its symbiotic relationship with alpheid shrimps, such as those from the genus Alpheus. In this mutualistic association, the shrimp digs and maintains a shared burrow while the goby stands guard, alerting the shrimp to potential dangers with subtle body movements. This partnership allows both species to thrive, with the shrimp gaining a lookout and the goby a well-maintained refuge.

Habitat

Amblyeleotris rhyax is found in the Western Pacific, typically in sandy areas adjacent to reefs. They prefer depths where they can easily access the sandy bottom to create their burrows, often seen in waters less than 30 meters deep. Their natural range includes areas around Indonesia and the Philippines.