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Smithsonian National Museum of Natural History
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Western clown anemonefish (Amphiprion ocellaris)

Western clown anemonefish (Amphiprion ocellaris) by Takako Uno

Lembeh Strait, North Sulawesi, Indonesia
by Takako Uno, Kumamoto, Kyushu, Japan

Western clown anemonefish reach about 4.3 inches in length and live in tropical waters within
the protection of venomous sea anemones. The anemonefish have a mucous coating that makes
them immune to the sting of the anemone. In this symbiotic relationship, the anemone may
benefit from the anemonefish’s consumption of parasites and from the fanning action of its fins,
which increases water circulation.

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