Clown Anemonefish

The common clownfish is a small fish which grows up to 11 cm (4.3 inches). Its body has a stocky appearance and oval shape. It is compressed laterally, with a round profile. The coloration of its body is orange to reddish-brown, but it can also be black in some particular areas such as the Northern Territory in Australia. It has three vertical white stripes outlined with a fine black line. The first passes just behind the eye, the second in the middle of the body widens forward to the head centrally and the third one circles the caudal peduncle. All the fins are also outlined with a fine black line. A. ocellaris is often confused with Amphiprion percula, which possesses exactly the same colours and patterns at first sight but distinguishes itself by the thickness of the black outlines. Additionally, A. ocellaris has a taller dorsal fin, and typically possesses 11 dorsal-fin spines vs.

This species is found in the Eastern Indian Ocean and in the western Pacific Ocean. As mentioned earlier, they can also be found in Hawaii, USA, North America, Northern Australia, Southeast Asia and Japan.

Amphiprion ocellaris typically lives in small groups on outer reef slopes or in sheltered lagoons at a maximal depth of 15 meters. It inhabits three different species of sea anemones: Heteractis magnifica, Stichodactyla gigantea and Stichodactyla mertensii and have symbiotic relationships with the anemone.

Amphiprion ocellaris feed on plankton and algae, thus they are considered omnivores. Feeding is also affected by the hierarchy in A. ocellaris groups. Since the smaller, less dominant fish face aggression from the more aggressive fish, they have less energy to forage for food. Thus, they usually do not eat as much as the dominant fish do, because of reduced energy, but also because of the increased danger they face when they leave their anemone since they are smaller. In other words, the larger fish will usually travel farther than the smaller fish. Generally, the A. ocellaris feed on algae, copepods, and zooplankton.

Amphiprion ocellaris is a diurnal fish. It is a protandrous hermaphrodite, which means the male can change its sex to female during its life, and lives in a harem in which an established dominance hierarchy manages the group and keeps individuals at a specific social rank.

It is aggressively territorial and is completely dependent on its sea anemone.

Amphiprion ocellaris have reproductive behaviors very similar to that of all anemonefish. They have monogamous mating systems, and in their spawning processes, they also have the same levels of aggressiveness between males and females. In addition, there is a reproductive hierarchy that exists between age and sex.

Amphiprion ocellaris are utilized as part of the tropical fish aquarium trade. However, only certain colors are in demand. In addition, A. ocellaris are used in research since they can be bred easily. This high demand in trade has been dangerous for A. ocellaris' population due to overexploitation .