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Amphiprion percula
Clownfish are peculiar fish that live in a symbiotic relationship with a range of anenome species (here a bubble anenome). They have a protective mucus that protects them from the anenomes nematocysts. In the anenome they can safely hide away from predators that do not have this protective mucus. The anenome is protected by the clownfish that are extremely territorial.
Clownfish are very popular in the aquarium trade. If you have a saltwater tank you should always question the origin of your organisms. Quite often the harvesting of aquaria specimens is highly detrimental to the reef and unsustainable. See this link for more info: http://www.carnuk.org/