Electric blue head and body; yellow ventral fin and rear half of anal fin; yellow tail extending just past tail base. Distinguished from Azure Damselfish by blue belly. Captive breeding successful at the experimental level only. Live animals should never be used to cycle new tanks. Live rock and other harmless alternatives exist. The Yellowtail Damselfish is among the top 10 most imported marine aquarium fishes in the U.S. Many were likely captured with cyanide.