Moorish idol

An icon of the coral reefs

The Moorish idol is a fish of extremely elegant, unmistakable appearance. Its body is tall, very laterally compressed, almost disc-shaped, and is crossed by broad vertical bands of black, white and yellow. Its snout is drawn out into a kind of small tube, with a tiny mouth. But its most distinctive feature is its dorsal fin: one of its rays extends into a long, thin, white filament that trails behind like a banner or a waving whip. It is the only living species of its family.

Habitat and distribution

It lives on the coral reefs of the tropical regions of the Indo-Pacific, from East Africa to the Pacific coasts of the Americas, and from southern Japan and Hawaii to Australia. It frequents the clear waters of the reefs, both the lagoons and the outer walls, sometimes even at considerable depths. It is often encountered in pairs or in small groups.

Feeding and behaviour

Thanks to its elongated snout and small mouth, the Moorish idol is specialised in picking food from the crevices and surfaces of the reef. It feeds above all on sponges, but also on algae and small invertebrates. It is a diurnal, active fish that swims elegantly among the corals. Although its beauty makes it highly coveted, it is notoriously difficult to keep in an aquarium precisely because of its very specialised diet.

Curiosities and conservation

The Moorish idol is classified as a species of least concern. Its image is famous all over the world and has become familiar also through representations in popular culture. It should be remembered, however, that because of its particular feeding, it is a fish that lives best in its natural environment, among the corals, rather than in captivity.