Common name: Surf redfish

General information

The Pincushion Sea Urchin, scientifically known as Actinopyga mauritiana, is a distinctive echinoderm that is popular among reef aquarium enthusiasts. This species is known for its large size and the presence of mucus-covered tentacles that extend from between its spines. These tentacles are used for feeding and can be quite striking when fully extended.

Care

In the home aquarium, Actinopyga mauritiana requires a tank with plenty of live rock and a sandy substrate to mimic its natural habitat. It is important to maintain stable water conditions, as sea urchins can be sensitive to fluctuations in water quality. They are herbivores, grazing on algae and detritus, so ensuring a supply of algae or providing seaweed sheets can keep them well-fed.

Reproduction

Pincushion Sea Urchins reproduce by releasing sperm and eggs into the water column, where fertilization occurs externally. In the aquarium, breeding is rare, but with optimal conditions, it is possible to observe spawning behavior.

Symbiosis

Actinopyga mauritiana has an interesting relationship with various reef fish, which may pick off parasites and dead skin from the urchin's body. This cleaning behavior benefits both parties, as the fish receive a meal and the urchin is kept healthy.

Habitat

Naturally found in the Indo-Pacific region, the Pincushion Sea Urchin inhabits coral reefs and lagoons, often hiding during the day and emerging at night to feed. They are typically found at depths where light is sufficient for algal growth, as this is their primary food source.