Common name: Blue-spotted Urchin

General Information

The Blue-spotted Urchin, scientifically known as Astropyga radiata, is a strikingly beautiful echinoderm found in tropical reefs. Its vibrant red coloration with radiating blue spots makes it a popular choice among marine aquarium enthusiasts. This species is not only admired for its appearance but also for its unique role in the ecosystem as a grazer, helping to keep algae in check.

Despite its beauty, Astropyga radiata requires careful handling due to its long, sharp spines that can inflict painful stings. Hobbyists appreciate its contribution to maintaining a balanced aquarium environment, as well as its aesthetic appeal.

Care

Caring for the Blue-spotted Urchin requires attention to water quality and habitat conditions. They thrive in established reef tanks with stable water parameters. A well-aerated environment with plenty of live rock provides the necessary surfaces for grazing and exploration. While they are generally hardy, maintaining consistent salinity and temperature is crucial to their well-being.

Diet and Feeding

Astropyga radiata is a herbivore, primarily feeding on algae. In captivity, they should be provided with a diet that includes natural algae growth on live rock, supplemented with dried seaweed or algae-based foods. Ensuring a consistent supply of food is important to prevent them from starving, as they can be quite efficient at clearing algae.

Behavior and Compatibility

The Blue-spotted Urchin is generally peaceful and can coexist with a variety of reef-safe fish and invertebrates. However, due to its spiny nature, it should be housed with caution alongside delicate corals or small, slow-moving fish that might inadvertently come into contact with its spines.

While not aggressive, its spines can pose a physical threat to tank mates that venture too close. It's essential to monitor interactions and ensure that the urchin has enough space to roam without disturbing other inhabitants.

Health and Common Issues

Astropyga radiata can live several years in captivity with proper care. Selecting a healthy specimen involves looking for vibrant coloration and intact spines. Avoid individuals with damaged spines or signs of stress, such as bleaching.

Maintaining optimal water quality and a stable environment are key to preventing common issues such as spine loss or bleaching. Regular monitoring and adjustments to the tank setup can help ensure the urchin remains healthy.

Habitat

Naturally found in the Indo-Pacific region, the Blue-spotted Urchin inhabits coral reefs and sandy areas at depths ranging from 1 to 30 meters. They prefer warm, tropical waters with abundant algae growth, which provides both food and camouflage from predators.

Creating a similar environment in captivity involves providing plenty of live rock and maintaining stable, tropical water conditions with moderate flow. This setup will encourage natural behaviors and promote the overall health of the urchin.