The Fantastic Fishing Gear of Antennariid Anglerfishes

An angler fishing for prey

An angler “fishing” for prey

As someone who enjoys a day on the water fishing, I have to give a tip of the hat to the various anglerfishes (a.k.a. frogfishes) of the family Antennariidae. These incredibly cryptic fishes make us human anglers look like rank amateurs. After all, to pursue our fishing passion, we have to purchase rods, reels, line, sinkers, swivels, and all manner of baits and lures. Anglerfishes, on the other hand, have all the fishing tackle they need attached directly to their body—and they don’t even need a license!

Built-in gear

So what type of fishing “tackle” do antennariid anglers possess? Most are equipped with a modified first dorsal spine, known as the illicium, which functions as a fishing rod. Attached to the end of the illicium is a fleshy lure, called the esca.

When not in feeding mode, this built-in fishing pole lies flat against the angler’s body, but when a potential prey item comes into view, the angler will raise its illicium and begin to “cast” its bait in hopes of luring the prey animal close enough to gulp it down. The poor, unsuspecting prey animal, thinking it’s about to enjoy an easy meal, winds up inside the angler’s capacious mouth before it even knows what hit it.

Talk about bait and switch!

Juvenile Wartskin Angler (A. maculatus)

Juvenile Wartskin Angler (A. maculatus)

And antennariids can consume some surprisingly large prey—some even as long as (or longer than) themselves. That’s something to think about if you ever plan to keep one of these anglers in a home aquarium.

What are they biting on?

Interestingly, different antennariid species (most that enter the hobby belong to the genus Antennarius) possess variously shaped and sized lures. For example, some are worm-like, some more fish-like, and others may have no particularly discernible shape but look irresistibly edible to fishes or crustaceans nonetheless.

Different species even manipulate their baits in different ways—waving or jiggling the illicium in a manner that imparts the most naturalistic movement possible to the lure.

Perfect camouflage

I should point out that the “bait and switch” feeding method is only one way that antennariids dupe their prey. This technique is effective only because the prey item cannot see the anglerfish. Why not? In addition to being expert anglers, antennariids are among the best camouflaged species in the sea.

A Painted Frogfish (Antennarius pictus) sits motionless

A Painted Frogfish (Antennarius pictus) sits motionless

Antennariids’ bodies are covered with all kinds of warts, bumps, lumps, and other appendages, and they’re capable of changing color to match their surroundings. To the casual observer, an angler may look like a sponge, patch of algae, or any other innocuous reef life. In fact, even when you know an antennariid is right in front of you, it can be very difficult to discern its outline against the reef backdrop.

Photo credits: Charles Tilford, prilfish, Joel Abroad

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About Jeff Kurtz

Jeff Kurtz is the Co-founder/Editor of Saltwater Smarts, former Senior Consulting Editor for Tropical Fish Hobbyist Magazine, and the aquarist formerly known as “The Salt Creep.” He has been an aquarium hobbyist for over 30 years and is an avid scuba diver.

Comments

  1. Paul Baldassano says:

    These things are surprisingly common, but hard to see. I recently dove in Hawaii and Tahiti and saw quite a few of them. I also kept a number of them over the years and tried to feed them saltwater grass shrimp when I could collect them, but I used to run out of shrimp in the winter so I would take a live guppy and inject cod liver oil into it, then feed it to my anglerfish. It seemed to work well although scientifically I am not sure if that is a good idea or not.

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