Common name: Blue-spotted urchin

General information

The Red Sea Urchin, or Astropyga radiata, is a striking species known for its bright red coloration and long, radiating spines. It is a popular choice among advanced reef hobbyists who appreciate its unique appearance and the dynamic element it adds to the aquarium. Despite its common name, it is not limited to the Red Sea and can be found in various tropical waters.

Care

Astropyga radiata requires a well-established aquarium with plenty of live rock and a sandy substrate to mimic its natural habitat. It is important to maintain stable water conditions, as sudden changes can stress the urchin. They are generally hardy but should be handled with care due to their sharp spines. This species is an algae grazer and will help control algae growth in the tank.

Reproduction

In the wild, Astropyga radiata reproduces by releasing gametes into the water column during synchronized spawning events. In captivity, breeding is less common, but hobbyists can encourage spawning by mimicking natural seasonal changes in water temperature and lighting.

Symbiosis

Astropyga radiata has an interesting symbiotic relationship with various species of shrimps and crabs that live among its spines for protection. In return, these small creatures help keep the urchin free from parasites and debris.

Habitat

This species is commonly found in shallow reef environments, often hiding during the day and emerging at night to feed. They prefer areas with strong water movement and ample access to algae-covered surfaces.