Common name: Red Sea Urchin

General Information

The Red Sea Urchin, scientifically known as Mesocentrotus franciscanus, is a fascinating echinoderm native to the Pacific Ocean. Its striking red appearance makes it a captivating addition to marine aquariums, especially for enthusiasts interested in invertebrates. This species is notable for its long, sharp spines and vibrant coloration, which can vary from bright red to dark burgundy.

While not as commonly kept as fish or corals, the Red Sea Urchin plays an important role in marine ecosystems and can contribute to the diversity of a home aquarium. It is appreciated for its unique appearance and its role in controlling algae growth, making it a functional addition to reef tanks.

Care

Red Sea Urchins require well-established aquariums with stable water conditions. They are sensitive to fluctuations in water parameters and require a mature tank with plenty of live rock to graze on. These urchins are excellent at controlling algae, which is both a benefit and a consideration, as they may also consume desirable macroalgae.

A tank with a minimum volume of 100 liters is recommended to provide ample space for movement and grazing. The tank should have a secure lid as urchins can sometimes dislodge equipment or attempt to escape.

Diet and Feeding

In the wild, Red Sea Urchins are primarily herbivores, feeding on a variety of algae. In captivity, their diet can be supplemented with dried seaweed or algae sheets, and they may also consume detritus. Regular feeding is important to ensure they receive adequate nutrition, especially in tanks with limited natural algae growth.

Behavior and Compatibility

Red Sea Urchins are generally peaceful and can coexist with a variety of marine species. However, their spines can cause injury to other tank inhabitants or aquarists, so caution is advised when handling or arranging the tank.

They are not known to exhibit aggressive behavior but may inadvertently damage corals or rockwork due to their constant grazing and movement.

Health and Common Issues

Maintaining stable water conditions is crucial for the health of Red Sea Urchins. They can be sensitive to poor water quality and require regular monitoring to prevent issues like spine loss or disease. Proper acclimation is important when introducing them to a new tank to minimize stress.

Habitat

Red Sea Urchins are typically found along the rocky coastlines of the Pacific Ocean, from Alaska to Baja California. They inhabit shallow waters, often in kelp forests, where they play a role in the ecosystem by grazing on algae and helping to maintain the balance of the marine environment.