Known locally as “inggu badut,” the clown anemonefish (Amphiprion ocellaris) is a small but iconic reef-dwelling species that serves as a symbol of tropical coral reef ecosystems. A. ocellaris belongs to the family Pomacentridae, which includes damselfishes and anemonefishes known for their ecological importance in coral reef ecosystems (Allen, 1991; Frouse & Pauly, 2026). There are 437 species in this family, and they were historically divided into two genera, Amphiprion and Premnas; Premnas is now considered a synonym of Amphiprion according to Fricke, Eschmeyer & van der Laan (2025). Currently, only 31 species are recognised as valid (Allen, 1991; Frouse & Pauly, 2026). A. ocellaris is well-known for its distinctive characteristics, which include an orange body with three vertical white lines (Yamanaka et al., 2024). This characteristic colouration results from the specific distribution of three pigment cell types: melanophores, xanthophores, and iridophores. These pigment cells together produce the vertical white-barred pattern on the orange background (Miyake et al., 2025).

This species has a wide distribution in the Indo-West Pacific, from the Eastern Indian Ocean to the Indonesian and Philippine archipelagos, and further north from northwestern Australia to the Ryukyu Islands in Japan (Allen, 1980; Nelson et al., 2000). This broad distribution suggests that the species thrives in warm marine environments, where water temperatures are optimal for survival and reproduction (Velasco-Blanco et al., 2019). A. ocellaris is also highly valuable in the global market for its use as an ornamental fish for a marine aquarium, due to its attractive appearance, small size, and ease of maintenance (Ajith Kumar & Balasubramanian, 2009; Velasco-Blanco et al., 2019).

Ecologically, A. ocellaris depends on a symbiotic relationship with host sea anemones. It forms close associations with up to three species, which are Stichodactyla gigantea, S. haddoni, and Heteractis magnifica (Roux et al., 2020). This symbiotic relationship enables them to coexist freely in shallow coral reefs without any harm caused by the nematocysts from their anemones (Nguyen et al., 2024). Adults also obtain nutrients from mucus and ectodermal secretions of their host anemone, supplementing their diet with captured planktonic prey (Roux et al., 2020). This relationship is maintained through a protective mucous layer on the fish’s skin, preventing nematocyst stings and enabling mutual benefits such as microbial exchange and habitat protection (Nguyen et al., 2024; Roux et al., 2019).

In Malaysia, A. ocellaris plays a notable role in the marine ornamental fish trade, where its supply is heavily dependent on wild-caught specimens, posing a risk of overexploitation (Cato & Brown, 2003; Chapman, 1997; Khoo et al., 2019). However, the species is currently listed as Least Concern (LC) under the IUCN Red List version 3.1, indicating no immediate risk of extinction across its global range (Allen et al., 2022). Increasing threats to coral reefs may eventually impact population stability, as A. ocellaris relies on specific anemone hosts. Habitat degradation caused by sedimentation, eutrophication, overexploitation of marine resources, and rising sea temperatures associated with global warming could reduce the availability of suitable reef environments for A. ocellaris (Bhat, 2004). Therefore, continuous monitoring of wild populations is essential to ensure the long-term sustainability of this species amid collection pressures and changing environmental conditions.