WhyReef - Threats
In the reef community, pacific gregory damselfish act as protectors of algae and coral, driving away many fish that would normally feast on them. So it makes sense that, where there are many damselfish—such as the waters off the coast of Hawaii and Australia—there are also healthy communities of algae and coral. Because of its unusual importance to the reef ecosystem, the pacific gregory damselfish is called a keystone species. If too many damselfish are fished out of the sea, the delicate balance they maintain will be thrown off!
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