Common name: banded sea urchin

General information

The Banded Urchin, Echinothrix calamaris, is a striking sea urchin species known for its long, banded spines that exhibit alternating dark and light coloration. These spines serve as a defense mechanism against predators and can also be venomous, causing a painful sting if handled carelessly. This species is part of the Diadematidae family, which is characterized by urchins with long, thin spines.

In the wild, Banded Urchins are often found in crevices or under rocks during the day, coming out at night to feed. They are an interesting addition to a reef aquarium due to their unique appearance and their role in controlling algae growth.

Care

Banded Urchins require a tank with plenty of live rock and a stable environment to thrive. They are excellent algae grazers and will help keep the tank clean by consuming unwanted algae. However, they may also inadvertently dislodge small corals or invertebrates as they move around, so care should be taken when placing delicate species.

It's important to monitor water quality, as Banded Urchins can be sensitive to high nitrate levels and fluctuations in water parameters. They are generally hardy and can adapt to a range of conditions once acclimated.

Reproduction

In the aquarium, reproduction of Banded Urchins is a rare event. In the wild, they reproduce by releasing gametes into the water column, where fertilization occurs externally. The resulting larvae are planktonic before settling down and metamorphosing into juvenile urchins.

Habitat

Banded Urchins are found in the Indo-Pacific region, from the Red Sea and East Africa to the central Pacific. They inhabit coral reefs and rocky areas, typically at depths ranging from shallow waters to about 30 meters. They prefer areas with moderate to strong water movement, which helps in feeding and respiration.