Amphiprion chrysogaster, the Mauritian anemonefish, is a marine fish belonging to the family Pomacentridae, the clownfishes and damselfishes. It is endemic to Mauritius and probably Réunion.^[2]

Quick Facts Amphiprion chrysogaster, Conservation status ...

Amphiprion chrysogaster
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Family:	Pomacentridae
Genus:	Amphiprion
Species:	A. chrysogaster
Binomial name
Amphiprion chrysogaster Cuvier, 1830

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Clownfish or anemonefish are fishes that, in the wild, form symbiotic mutualisms with sea anemones and are unaffected by the stinging tentacles of the host anemone, see Amphiprioninae § Symbiosis and mutualism. The sea anemone protects the clownfish from predators, as well as providing food through the scraps left from the anemone's meals and occasional dead anemone tentacles. In return, the clownfish defends the anemone from its predators, and parasites.^[3] Clownfish are small-sized, 10–18 centimetres (3.9–7.1 in), and depending on species, they are overall yellow, orange, or a reddish or blackish color, and many show white bars or patches. Within species there may be color variations, most commonly according to distribution, but also based on sex, age and host anemone. Clownfish are found in warmer waters of the Indian and Pacific oceans and the Red Sea in sheltered reefs or in shallow lagoons.

In a group of clownfish, there is a strict dominance hierarchy. The largest and most aggressive fish is female and is found at the top. Only two clownfish, a male and a female, in a group reproduce through external fertilization. Clownfish are sequential hermaphrodites, meaning that they develop into males first, and when they mature, they become females.

Adults are very dark brown, nearly black with three white bars. The snout and breast are orange. The caudal fin is blackish or dark brown and the anal fin may be blackish or orange-yellow.^[2] They have 10 dorsal spines, 2 anal spines, 16-17 dorsal soft rays and 13-14 anal soft rays.^[4] They reach a maximum length of 14 cm (5+1⁄2 in).^[2]

The Mauritian anemonefish is found only in Mauritius and probably Réunion.^[2]