Amphiprion polymnus, commonly known as the saddleback clownfish or yellowfin anemonefish, is a black and white species of fish that is known for its distinctive saddle pattern. This species of anemonefish forms a symbiotic relationship with sea anemones and is protected from their stinging tentacles. The species follows a strict hierarchy based on size, with the largest fish being the female, followed by the breeding male, and then smaller non-breeding males. If the breeding female dies, the breeding male will change to female and the largest non-breeder will become the breeding male. This behavior is known as protandry.
Size: 11 cm
Habitat: These fish typically inhabit coral reefs and are associated with sea anemones, which provide both shelter and protection. The saddleback clownfish is a reef-associated species that can be found in shallow lagoons and protected seaward reefs.
Distribution: Indo-Pacific region, including the Great Barrier Reef, Philippines, Indonesia, Red Sea and East Africa to the Line Islands, Marquesas, and Tonga