Spiny-tufted frogfish

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 most 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 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 coloration 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. The maximum published standard length is 5.8 cm.

Reader's Guide

The spiny-tufted frogfish is known from the Indo-Pacific region, with records 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, and inhabits the sponge zone on the seaward side of reefs. The species is oviparous, with females laying egg masses in ribbons of gelatinous mucus called 'egg rafts' or 'veils,' from which planktonic larvae emerge. It is piscivorous, attracting prey with its shrimp-like esca. The rosy frogfish is infrequently taken from the wild for sale in the aquarium trade. Its significance lies in its distinctive morphology and behavior, including its prehensile pectoral fin with an elbow-like joint, and its role as a small predator in 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.