Commerson's frogfish
A variable frogfish using a built-in lure to attract prey.
The giant frogfish, or Commerson's frogfish (Antennarius commerson), is a euryhaline ray-finned fish from the frogfish family Antennariidae. It lives across the Indo-Pacific region.
Its scientific name comes from *antenna*, referring to the first spine on its back, which is modified into a snout tentacle used as a lure. The species name honors French naturalist Philibert Commerçon, whose notes were used by Bernard Germain de Lacépède when he first described the fish in 1798 as *Lophius commerson*.
This fish can reach 38 cm (15 in) in total length. It has a round, stretchy body covered in soft skin with small spines and a few wartlike bumps, scab-like patches, and small eye spots that look like sponge holes. Its large, protruding mouth lets it swallow prey as big as itself. Color varies wildly—from gray to black, cream, pink, yellow, red, or brown—often matching its surroundings. It can change color over a few weeks. Juveniles can be confused with related species: *Antennarius maculatus* has red or orange fin edges and many warts, while *Antennarius pictus* has three eye spots on its tail fin and is covered in ocelli.
The first dorsal spine, called the illicium, acts as a fishing rod. Its tip has a pinkish to brownish lure that looks like a small fish or shrimp. The illicium is twice as long as the second dorsal spine and often has dark bands. The second spine is straight and movable; the third bends backward. Both are attached to the head by membranes and are separated from each other and the dorsal fin.
Commerson's frogfish lives in tropical and subtropical waters from the Indian Ocean to the eastern Pacific. It stays in lagoons, sheltered rocky and coral reefs, often near big sponges, underwater ropes, jetty pillars, or similar structures down to 70 m (230 ft) deep, usually around 20 m (66 ft).
A solitary, bottom-dwelling predator, it eats any small animal that comes close—mostly fish, sometimes even others of its kind. It uses its lure to attract prey. During mating, males and females gather, but after fertilization, the female may kill or eat the male if he stays nearby.
Quick Facts
- Taxon
- Antennarius commerson
Facts from the source article.
Lore & Background
Commerson's frogfish was first formally described in 1798 as Lophius commeron by French naturalist Bernard Germain de Lacépède, with its type locality given as Mauritius. Within the genus Antennarius, this species belongs to the Antennarius pictus group. The 5th edition of Fishes of the World classifies the genus Antennarius in the family Antennariidae within the suborder Antennarioidei and order Lophiiformes, the anglerfishes. Its specific name honours Philibert Commerçon, the French naturalist whose note Lacépède used to describe this species, although the name is often erroneously attributed to Pierre André Latreille in 1804.
Its soft skin is covered with small dermal spinules and partially covered with a few small, wartlike protuberances, some variably shaped, scab-like blotches, and a few small eye spots reminiscent of holes in sponges. Its large mouth is prognathous, allowing it to consume prey as large as itself. Coloration is extremely variable, ranging from grey to black, passing through cream, pink, yellow, red, and brown, usually with circular eye spots or blotches darker than the background. The first dorsal spine, the illicium, is modified as a fishing rod with a pinkish to brownish esca (lure) resembling a small fish or shrimp. The illicium is twice the length of the second dorsal spine and is often darkly banded.
Juvenile specimens can easily be confused with related Antennarius maculatus and Antennarius pictus. To distinguish these species, A. maculatus usually has red or orange margins on all fins, while A. maculatus has numerous warts on the skin, and A. pictus is covered with ocelli. A. pictus has three eye spots on its caudal fin. Commerson's frogfish lives in lagoons and sheltered rocky and coral reefs, usually associated with big sponges, on underwater ropes, on jetty pillars, or any structures down to 70 m deep.
Reader's Guide
Commerson's frogfish is a significant species within the family Antennariidae due to its large size, reaching up to 38 cm in total length, and its extreme color variability that allows it to match its environment. Its ability to change coloration over a few weeks, ranging from grey to black through cream, pink, yellow, red, and brown, makes it a notable example of adaptive camouflage among frogfishes. The species is also distinguished by its modified first dorsal spine, the illicium, which functions as a fishing rod with a lure that resembles a small fish or shrimp, used to attract prey. As a voracious carnivore, it attacks any small animals that pass within range, mainly other fish, and sometimes even congeners. Its benthic and solitary lifestyle, with males risking being killed or eaten by females after mating, highlights its aggressive predatory nature. The species is found in tropical and subtropical waters from the Indian Ocean to the eastern coasts of the Pacific Ocean, typically in lagoons and sheltered rocky and coral reefs down to 70 m deep. Its association with big sponges and artificial structures like jetty pillars underscores its adaptability to various habitats. The taxonomic history, including its first description in 1798 and the attribution of its name to Philibert Commerçon, adds to its legacy as a well-documented anglerfish species.
Did You Know?
- Commerson's frogfish can change its coloration over a few weeks to match its environment.
- The species can consume prey as large as itself due to its large, prognathous mouth.
- Juveniles can easily be confused with Antennarius maculatus and Antennarius pictus.
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