How to Identify Striated Frogfish

To identify Striated Frogfish (Antennarius striatus), look at these key features.

Physical Characteristics

Body shape

rounded

Coloration

Highly variable, ranging from yellow, orange, red, brown, black, to white, often mottled or striped to match their environment. They can change color over days or weeks to better blend in. Often covered in filamentous dermal appendages (striations) that resemble algae, hydroids, or detritus.

Scale type

none

Mouth position

superior

Distinctive features

Highly modified first dorsal spine (illicium) topped with a fleshy 'lure' (esca) resembling a small shrimp or worm., Globular, compressed body with large, upward-pointing mouth., Pectoral fins are limb-like, used for 'walking' on the substrate., Skin covered in numerous dermal appendages (striations) that vary in length and density.

Dorsal fin

Three dorsal spines; the first is modified into an illicium and esca, the second and third are separate and covered by skin. A soft-rayed dorsal fin is present posteriorly.

Tail fin

Rounded caudal fin, often small and inconspicuous.

Pectoral fin

Large, limb-like, and highly mobile, used for propulsion and 'walking' along the bottom.

Distinctive fins

Pelvic fins are jugular (located anterior to the pectoral fins), small, and used for support.

Identification Tips

1. 1

   Illicium and Esca

   Observe the 'fishing rod' (illicium) and its 'lure' (esca). The esca of A. striatus is typically a tuft of worm-like appendages, often resembling a small shrimp or worm, which it wiggles to attract prey. This is a key differentiator from other frogfish species.

2. 2

   Dermal Appendages (Striations)

   Look for the characteristic 'hairy' or 'striated' appearance due to numerous, often long, dermal filaments covering the body. The density and length of these appendages can vary significantly.

3. 3

   Coloration and Pattern

   While highly variable, A. striatus often exhibits mottled or striped patterns that help it blend into its specific environment. The ability to change color over time is also a strong indicator.

4. 4

   Limb-like Pectoral Fins

   Note the large, elbow-like pectoral fins used for 'walking' on the substrate rather than swimming. This is characteristic of all frogfish.

Explore Striated Frogfish