Reef triggerfish

What it is

This fish belongs to the triggerfish family and grows up to 30 centimetres long. It has a distinctive orange-brown back, white belly, and blue lips that resemble a pig’s snout. A small second dorsal spine locks the main spine upright, helping it wedge into crevices for protection. Its thick skin and strong teeth are adapted for scraping food from hard surfaces.

Where it lives

It inhabits coral reefs across the Western and Eastern Central Pacific Oceans. Its range extends through the Indian Ocean and into the Southeast Atlantic. These fish live in shallow waters, typically found at depths between zero and fifty metres. They prefer areas near living coral or sandy floors where they can forage safely.

How it lives

The reef triggerfish is a facultative omnivore, eating algae and small crustaceans like isopods. It uses its terminal mouth to scrape food off rocks and sand. This species produces four distinct sounds: grinding, drumming, grunting, and snapping. Drumming helps deter predators, while grinding signals territory ownership. It swims using flexible dorsal and anal fins, allowing it to hover or move backwards.

Breeding and life cycle

Males and females are both territorial. Males establish dominance to access multiple mates in a harem system, while females select spawning sites based on food availability and safety. Females invest energy in reaching maturity early, resulting in smaller sizes compared to males. Males focus more on physical growth to defend their territories and mates.

Fish and people

In 1985, it became the official fish of Hawaii, a title reinstated permanently in 2006. Hawaiian mythology links it to the pig god Kamapuaʻa, who transformed into the fish after a battle with the goddess Pele. Its thick skin symbolises armour against her waves. The fish appears in songs, films, and television shows, often referenced by its long Hawaiian name.

Status and threats

The International Union for Conservation of Nature lists it as Least Concern. However, climate change poses a threat to its coral reef habitat. Rising temperatures can lower oxygen levels in the water. Studies suggest this species can tolerate high levels of hypoxia, which may help it survive changing conditions better than other reef dwellers.

Relatives and look-alikes

It is often confused with two close relatives: the lagoon triggerfish and the picasso triggerfish. These species share similar behaviours and physical traits, such as territorial nature and body shape. Observations of picasso triggerfish reproduction provide insights into the likely breeding habits of the reef triggerfish.

Questions people ask about Reef triggerfish

Good reading and sources

• Reef triggerfish on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data