Common name: Fire Urchin

General information

The Fire Urchin, scientifically known as Asthenosoma ijimai, is a visually striking sea urchin species known for its vivid coloration and long, venomous spines. It is a member of the Echinoidea class and is found in various parts of the Indo-Pacific region. The vibrant colors of this urchin, which range from red to purple with bright yellow or orange tips, serve as a warning to potential predators about its venomous nature.

Care

Fire Urchins require a specific set of conditions to thrive in captivity. They need a spacious tank with plenty of live rock and a stable, mature environment. The substrate should be fine to avoid injury to the urchin's delicate tube feet. It's important to maintain excellent water quality, as Fire Urchins are sensitive to nitrate and phosphate levels. They are primarily nocturnal and will often hide during the day.

Reproduction

In the wild, Asthenosoma ijimai reproduces by releasing gametes into the water column, a process known as broadcast spawning. In the aquarium, breeding Fire Urchins is quite challenging and rarely observed. Successful captive breeding would require a large, species-specific setup to mimic natural conditions.

Symbiosis

Fire Urchins have a fascinating symbiotic relationship with certain species of small fish and shrimps, such as the Coleman Shrimp (Periclimenes colemani). These creatures live among the urchin's spines, gaining protection from predators while keeping the urchin clean from parasites and debris.

Habitat

The natural habitat of the Fire Urchin includes coral reefs and rocky substrates in the Indo-Pacific region, where it can be found at various depths. It prefers areas with moderate to strong water currents, which facilitate the delivery of planktonic food to its location.