Abantennarius rosaceus
A small, pinkish frogfish with a shrimp-like lure.
The rosy frogfish, also called the rosy anglerfish, pink anglerfish, or spiny tufted frogfish, is a small marine fish from the family Antennariidae. Its scientific name is *Abantennarius rosaceus*, and it lives in the Indo-Pacific region.
This species was first described in 1912 by American zoologists Hugh McCormick Smith and Lewis Radcliffe, who originally placed it in the genus *Antennarius* based on a specimen from Romblon in the Philippines. The genus name *Abantennarius* combines the prefix *ab* (meaning "away from") with *antennarius* (a fish in the family Antennariidae), referring to the gill opening’s position away from the base of the pectoral fin—unlike most frogfishes. The specific name *rosaceus* means "pink," a nod to its rosy color when preserved in alcohol.
The rosy frogfish has a clear caudal peduncle, and the rear edges of its dorsal and anal fins connect to it. Its gill opening sits close to or on the base of the pectoral fin. The illicium (fishing rod) is clearly longer than the second dorsal spine and ends in an esca (lure) that is elongated with tapering filaments and a cluster of dark, round swellings at its base. The second dorsal spine is thin, straight, and tapering, with small clusters of threads along its length. The second dorsal fin has 12 or 13 soft rays, and the anal fin has 7 or 8. Like other members of its genus, it has a prehensile pectoral fin with an elbow-like joint. The body lacks scales and is covered in bifurcated spinules. Typical coloration is pinkish-purple with a dark spot on the upper body near the base of the dorsal fin, plus a reticulated pattern over the body. The maximum recorded standard length is 5.8 cm (2.3 in).
The species is known from a single record in the Red Sea, and elsewhere from Indonesia and the Philippines east to the Marshall Islands and Samoa, north to southern Japan, and south to New Caledonia and Australia. In Australia, it has been found at Lord Howe Island and the North West Shelf. It lives on reefs at depths from 0 to 130 m (0 to 427 ft), typically between 30 and 40 m (98 to 131 ft), often in the sponge zone on flat areas on the seaward side of reefs.
*Abantennarius rosaceus* is oviparous: females lay egg masses in ribbons of gelatinous mucus called egg rafts or veils, where the eggs remain until planktonic larvae emerge.
Quick Facts
- Taxon
- Abantennarius rosaceus
Facts from the source article.
Lore & Background
Abantennarius rosaceus was first formally described in 1912 as Antennarius rosaceus by American zoologists Hugh McCormick Smith and Lewis Radcliffe, with the type locality given as Romblon in the Philippines. The genus name Abantennarius combines ab, meaning 'away from', with antennarius, referring to the gill opening being positioned away from the base of the pectoral fin, unlike in typical frogfishes. The specific name rosaceus means 'pink', alluding to its rosy color in alcohol.
The rosy frogfish has a clear caudal peduncle, and the rear edges of the dorsal and anal fins are connected to it. Its illicium is clearly longer than the second dorsal spine and bears an esca (lure) that is elongate with tapering filaments and a cluster of dark, round swellings at its base. The second dorsal spine is thin, straight, and tapering, with small clusters of threads along its length. The body lacks scales and is covered with bifurcated spinules. Typical color is pinkish-purple with a dark spot on the upper body near the base of the dorsal fin and a reticulated pattern over the body.
This species is known from the Red Sea (single record), Indonesia, the Philippines, east to the Marshall Islands and Samoa, north to southern Japan, and south to New Caledonia and Australia (Lord Howe Island and the North West Shelf). It is associated with reefs at depths between 0 and 130 m, typically between 30 and 40 m, inhabiting the sponge zone at moderate depths and possibly found on flat areas on the seaward side of reefs.
Reader's Guide
Abantennarius rosaceus is a small, cryptic frogfish that relies on its shrimp-like esca to attract prey within striking range, being piscivorous. It is oviparous, with females laying egg masses within ribbons of gelatinous mucus known as egg rafts or veils, from which planktonic larvae emerge. The species is infrequently taken from the wild for sale in the aquarium trade, indicating limited commercial interest. Its distribution across the Indo-Pacific, from the Red Sea to Samoa and Japan to Australia, suggests a broad but patchy occurrence, with a single record from the Red Sea. The species is notable for its small maximum size of 5.8 cm and its distinctive pinkish-purple coloration with a reticulated pattern. The gill opening's position—close to or on the base of the pectoral fin—is a key anatomical feature that distinguishes it from some other frogfishes. The species' reliance on sponge zones at moderate depths highlights its specialized habitat preferences within reef ecosystems.
Did You Know?
- The specific name rosaceus means 'pink', referring to its rosy color in alcohol.
- It has a shrimp-like esca (lure) used to attract prey.
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