Damselfish are classified in the phylum Chordata, subphylum Vertebrata, class Osteichthyes, order Perciformes, family Pomacentridae. Damselfish belong to the Pomacentridae family. Aquarists often use Damselfish to biologically stabilize a new aquarium. Damselfish are found throughout the world, and are almost always associated with coral reefs. Males of this family guard the eggs passionately. Damselfish are closely related to Clownfish. The average size of most Damsels in an aquarium is around two inches, but in the wild the largest member of this family reaches over 14 inches in length.
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