WhyReef - Lifestyle

Because its patch of algae serves as home, food, and nest all in one, the pacific gregory damselfish values this tiny territory above all else! It can usually be found around dead coral or rocks that are covered in algae, chasing off fish that try to steal its algae. Male damselfish are even aggressive to members of their own species: when they want to drive rival males from their home, they darken their yellow eyes to grey to show dominance.