What Divers Should Know About Frogfish

When divers speak of "frogfish," they often picture the masters of camouflage found on shallow coral reefs. However, the term "frog-fish" is also applied to members of the genus Lophius, more widely known as monkfish or anglerfish. These fascinating deep-sea inhabitants are characterized by their highly compressed heads and bodies, which feature distinctive spines and often low, blunt knobs. A particularly notable adaptation is the tentacle-like first three spines of their dorsal fin, lending them a unique "fishing-frog" appearance.

These robust fish exhibit a considerable size range, with the largest species, Lophius piscatorius, reaching an impressive 200 cm (79 inches) in length, while others like L. gastrophysus grow to about 67 cm (26 inches). Primarily found in the Atlantic and Indian Oceans, these deep-dwelling specialists occupy waters from 800 meters (2,600 feet) down to beyond 1,000 meters (3,300 feet). Due to these extreme depths, recreational divers will not typically encounter these particular "frog-fish" during their underwater explorations.