Common name: Purple sea urchin

General information

The Purple Sea Urchin, Strongylocentrotus purpuratus, is a species of sea urchin found along the eastern edge of the Pacific Ocean. It is known for its striking purple hue and its role in the marine ecosystem as both a grazer and a source of prey for other animals. In the reef aquarium, it can serve as an algae controller, helping to maintain clean rocks and glass.

Care

Purple Sea Urchins require a tank with plenty of live rock and a stable environment. They are sensitive to water quality and require consistent levels of salinity, pH, and temperature. They are herbivores and will graze on algae in the aquarium, but may also need supplemental feeding with seaweed or prepared urchin diets.

Reproduction

In the wild, Purple Sea Urchins reproduce by releasing gametes into the water column, where fertilization occurs externally. In the aquarium, breeding is less common but can be encouraged with proper water conditions and diet.

Habitat

Strongylocentrotus purpuratus is typically found in rocky subtidal environments from the low intertidal zone to depths of over 100 meters. They are common along the coasts of California and Baja California, where they play a significant role in shaping the kelp forest ecosystem.