The damselfishes are among the most numerous fishes
on the reef. The 47 species known from Guam occupy a variety
of habitats and exhibit a wide range of feeding types. Most
species are small, under 20 cm, and are either territorial or home-ranging,
rarely leaving the vicinity of their home coral patch. Unlike
most other reef fishes, damselfishes attach their eggs to the reef
and protect them while the embryos are developing inside.