Frogfish (Anglerfish)

Clown frogfish (Steve Childs / CC BY)

Frogfish (Antennariidae) have globular bodies and large upturned mouths. Most species are extremely well camouflaged, and some can change colors. A frogfish attracts potential prey by wiggling its first dorsal spine, which has evolved into a thin antenna tipped with a lure. Their ventral and pectoral fins have evolved into hand–like extremities. Frogfish range from 4.5 centimeters (1.8 inches, Randall's frogfish) to 30 centimeters (11.8 inches, giant frogfish) in length.

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This supplemental online resource accompanies the book Scuba Diving Hand Signals by Lars Behnke, available on Amazon.