Is it an invertebrate or sponge? Nope! it’s a Frogfish

Sometimes referred to as Anglers, Frogfish are remarkable fish. Expert in camouflage they can be found on rocky formations inside the coral reef where they blend perfectly with their surroundings, disguising themselves as sessile invertebrates or sponges.



The Frogfish has modified bottom fins which resemble legs, although capable of swimming if threatened, they remain protected on the coral reef where they move slowly “walking” on the rocks.

These fish are remarkable predators. Among their best weapons is an appendage adorned with a tip similar to a fisher’s bait where their name (anglers) comes from.

This modified dorsal spine is used to lured their preys, once their victims are close enough they will open their huge mouth swallowing the fish whole instantly (sometimes preys from their same own size) .

To defend themselves in the wild they can gulp water and air fast enough to increase their size just in time before they become another bigger fish’s meal.

The average size of most of these fish in an aquarium is around three inches in length. A relatively hardy species they adapt with no problem to the home aquarium environment as long as you provide them with plenty of rock and coral to hide.

They will accept most meaty meals including shrimps and feeder fish. It is hard to distinguish males from females, although usually males tend to be smaller than females.

Breeding them in a big aquariums is not a problem, however rearing of the offspring has proved to be a significant challenge between advanced aquarist.


Frogfish (Photo credit: PacificKlaus)

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