The Brilliant Damselfish is a vibrant and colorful species native to the Galapagos Islands. This small fish is easily recognized by its bright yellow body and striking blue markings. The brilliant damselfish is known for its lively and territorial nature, often seen in and around coral reefs where it actively defends its territory from intruders. In the Galapagos, the brilliant damselfish inhabits shallow, rocky, and coral reef environments. It prefers to stay close to the reef, where it can find shelter and resources. The fish feeds primarily on algae and small invertebrates, using its small mouth to graze on algae that grow on the reef surfaces. This species is considered native to the Galapagos Islands and is also found in other tropical waters across the Pacific Ocean.