Clownfish

Lore & Background

Clownfish are damselfishes (family Pomacentridae) in the genus Amphiprion. The genus was coined by Marcus Elieser Bloch and Johann Gottlob Theaenus Schneider in 1801. Georges Cuvier considered the maroon clownfish morphologically different enough to be placed in its own genus Premnas in 1816, but in 2021 phylogenetic analyses found the species to be within Amphiprion, making Premnas a junior synonym. In 1975, ichthyologist Gerald R. Allen placed clownfish in their own subfamily Amphiprioninae. A 2009 genetic study suggested creating the tribe Amphiprionini and moving them to the subfamily Pomacentrinae. Eschmeyer's Catalog of Fishes considers the genus to be part of Pomacentrinae though scientific papers still use Amphiprioninae. The clownfish lineage diverged from other damselfishes around 35 million years ago during the late Eocene, and the most recent common ancestor of extant species is dated around 10.5 mya during the Early Miocene. A 2014 study placed their origin in the waters of the Malay Archipelago. Prior to 2025, 28 living species were recognised along with two hybrids; in 2025, a new species, the Polynesian anemonefish (A. maohiensis), was classified.

In Their Own Story

The morning sun filtered through the turquoise water, casting dancing patterns across the coral floor. A small orange flash darted out from the safety of a swaying purple anemone, its white bands glowing like neon signs against the deep blue. It hovered just inches from the deadly tentacles, testing the current with a flick of its tail. Nearby, a larger fish grazed on algae, but the clownfish remained vigilant, watching for shadows that signaled danger. When a butterflyfish approached too close to the anemone's base, the clownfish surged forward, nipping at its fins until the intruder retreated. Safe within their stinging fortress, the pair resumed their quiet dance, a perfect balance of risk and reward in the heart of the reef.

Reader's Guide

Clownfish live in groups consisting of a breeding female and male, along with some non-breeding individuals. They have a size-based dominance hierarchy with the breeding female ranking at the top, followed by the breeding male and then the largest non-breeder and so on. When the female disappears, the breeding male changes sex and takes her place while the others move up the hierarchy. During reproduction, the female deposits eggs on a rock near their anemone, and the male fertilises them. After hatching, clownfish disperse into the open ocean as larvae, eventually settling on the bottom and searching for an anemone host as juveniles. Clownfish are omnivorous and mostly feed on plankton. They are limited by the distribution of their sea anemone hosts, which is usually near the surface.

Did You Know?

• Clownfish have saw-shaped edges along the operculum and under the eyes, which is the source of their genus name Amphiprion (Greek for 'on both sides' and 'saw').
• The maroon clownfish can reach 17 cm long while the orange clownfish reaches only 11 cm.
• Clownfish can see both in colour and ultraviolet light.
• The ocellaris clownfish ranks among the most commonly traded marine fish.