FROGFISH: THE FISH THAT WALKS, FISHES AND SWALLOWS ITS DINNER WHOLE
Frogfish ready for its next meal
Imagine a fish that looks like a sponge, walks like a rather disgruntled frog, carries a fishing rod on its head and can swallow another fish almost as large as itself.
Welcome to the wonderfully peculiar world of frogfish.
These extraordinary little predators belong to the family Antennariidae, part of the anglerfish order Lophiiformes.
They are relatives of our fabulous red-lipped batfish, although frogfish have largely abandoned the lipstick in favour of camouflage.
And what camouflage it is.
Some resemble colourful sea sponges. Others look like algae-covered rocks, lumps of coral or bits of seaweed that have seen better days.
But beneath those wonderfully deceptive disguises lurks one of the ocean's most astonishing ambush predators.
A FISH THAT PREFERS WALKING
Most fish spend their lives swimming.
Frogfish, apparently, did not receive that particular memo.
Instead, many spend their time perched on rocks, coral or the seafloor, using their modified pectoral fins to shuffle about.
Their pelvic fins can also help them brace and move across the bottom.
The result is a rather charming, if somewhat ungainly, underwater walk.
Imagine a little fish in an oversized sponge costume stomping about the reef, occasionally stopping to glare at passing marine life.
Some frogfish can swim when necessary, and a few use jet-like propulsion by forcing water through their gill openings.
But why bother swimming when dinner might come to you?
THE MASTER OF DISGUISE
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| Painted Frogfish, Master of Disguise |
Their bodies may be covered in bumps, fleshy projections, irregular markings and colours that help them blend into their surroundings.
The hairy frogfish, Antennarius striatus, can sport long, skin-like appendages that make it resemble a shaggy clump of seaweed.
The painted frogfish, Antennarius pictus, may resemble a brightly coloured sponge.
And the giant frogfish, Antennarius commerson, can grow to roughly 38 centimetres long, making it a rather substantial lump of apparently innocent reef decoration.
Some frogfish can change colour over time, although this is not the instantaneous colour-changing performance we associate with certain cephalopods.
Their disguise serves two purposes.
It helps them avoid being noticed by predators.
And it allows them to remain almost invisible to unsuspecting prey.
There is something wonderfully unfair about being eaten by what you thought was a sponge.
THE FISH WITH A FISHING ROD
Now for one of my favourite evolutionary inventions.
Frogfish have a modified dorsal-fin spine called an illicium, which acts rather like a miniature fishing rod.
At its tip is a lure called an esca.
Depending on the species, this lure may resemble a worm, a tiny fish or another tempting morsel.
The frogfish waves its lure near its mouth, hoping to attract the attention of a hungry little fish.
The unsuspecting visitor approaches.
Closer.
Closer still.
And then — GULP.
Dinner disappears.
No chasing. No elaborate pursuit. No need to book a table.
Just a fishing rod attached to your head and an extraordinary amount of patience.
THE FASTEST DINNER IN TOWN
Frogfish possess one of the most impressive feeding mechanisms in the animal kingdom.
When prey comes within range, a frogfish can rapidly expand its enormous mouth cavity, creating suction that pulls the unfortunate visitor inside.
The strike can happen in just a few milliseconds.
Their mouths can expand dramatically, allowing some frogfish to consume prey approaching their own body size.
They may even eat other frogfish. Family dinners must be rather tense. Imagine inviting your cousin over for lunch and discovering that you are lunch.
This astonishing feeding system is an example of suction feeding, a technique found in many fishes but taken to remarkable extremes by frogfish.
Their specialised jaws and expandable mouths allow them to capture prey with very little warning.
One moment, a small fish is investigating a promising-looking worm. The next, it has vanished into what appeared to be a harmless lump of coral. Nature can be wonderfully inventive. And occasionally rather rude.
WHO ARE THEIR RELATIVES?
Frogfish are members of the order Lophiiformes, the anglerfishes.
Their extended family includes some of the most peculiar creatures in the ocean.
There are the red-lipped batfishes, which walk across the seafloor looking permanently unimpressed.
There are monkfishes, with enormous flattened heads and mouths designed for swallowing unsuspecting prey.
And there are the famous deep-sea anglerfishes, some of which use glowing lures to attract prey in the darkness.
Not all anglerfishes live in the deep sea, and not all have glowing lures.
Frogfish generally inhabit tropical and subtropical marine environments, often around reefs, rocky bottoms and other habitats where camouflage is particularly useful.
They have taken the anglerfish family's remarkable fishing apparatus and turned it into a wonderfully effective tool for ambush hunting.
One branch of the family lives in darkness.
Another wanders about wearing lipstick.
And the frogfish sits disguised as a sponge, waiting for something edible to make a terrible decision.
FROGFISH IN THE FOSSIL RECORD
Now let's travel back through deep time.
The living frogfish family, Antennariidae, has a limited fossil record. We cannot trace every modern frogfish species neatly backwards through millions of years of preserved ancestors.
But the broader anglerfish lineage has a fascinating fossil history.
One particularly important fossil is Histionotophorus bassani, an extinct anglerfish known from the Eocene deposits of Monte Bolca in northern Italy.
The Eocene Epoch lasted from approximately 56 to 33.9 million years ago.
The famous Monte Bolca fossil beds preserve an extraordinary assemblage of marine fishes from roughly 50 million years ago, when the region was part of a warm marine environment.
Among the remarkable fossil fishes described from Monte Bolca are early representatives of the anglerfish lineage, helping palaeontologists understand how this unusual group evolved.
These fossils are not necessarily direct ancestors of living frogfish.
Instead, they provide evidence that the wider evolutionary group to which frogfish belong was already present in ancient Eocene seas.
There is an important difference between finding a fossil of a modern family and finding an older fossil belonging to its broader evolutionary lineage.
Both are valuable, but they tell us different parts of the story.
Frogfish themselves are difficult to document through fossils, partly because their delicate skeletal structures and the environments in which they live do not always favour preservation.
That leaves some wonderful questions.
When did their extraordinary camouflage evolve?
How early did their ancestors begin using specialised fins to walk along the seafloor?
And when did their fishing apparatus become the highly effective hunting tool we see today?
Fossils, comparative anatomy and genetic research all help scientists investigate these questions.
Perhaps one day an extraordinary fossil frogfish will emerge from an ancient seabed and help fill another gap in this remarkable evolutionary story.
I do hope it looks like a sponge.
FIVE FROGFISH FACTS TO IMPRESS YOUR FRIENDS
1. Frogfish can fish for fish. Their modified dorsal-fin spine carries a lure that helps attract prey directly towards their mouths.
2. They can swallow astonishingly large meals. Their expandable jaws and rapid suction feeding allow some species to consume prey approaching their own size.
3. They are masters of disguise. Depending on the species, frogfish can resemble sponges, algae, coral or other parts of their marine surroundings.
4. They have unusual ways of moving. Many use their modified fins to walk or brace themselves, while some can also propel themselves through the water by expelling water from their gill openings.
5. They are related to deep-sea anglerfish. Although they generally live in shallower environments, frogfish share an evolutionary history with some of the strangest predators in the deep ocean.
THE JOY OF BEING EXTRAORDINARILY ODD
What I love most about frogfish is how beautifully they demonstrate the creativity of evolution.
Here is an animal that has evolved a remarkable combination of camouflage, specialised movement, an extraordinary feeding mechanism and a fishing lure built directly into its anatomy.
Its relatives appear in fossil deposits tens of millions of years old, connecting this modern marine oddity to an ancient and wonderfully diverse evolutionary lineage.
And although the fossil record has yet to reveal every chapter of the frogfish story, the living animals offer a marvellous glimpse of what millions of years of adaptation can produce.
Some fishes evolved for speed. Others for long-distance migration.
The frogfish evolved to look like a sponge, wave a fishing rod and swallow dinner whole.
And somehow, that seems like a perfectly respectable life choice.
There are extraordinary stories waiting beneath the waves, beneath our feet and within the ancient rocks that preserve our planet's remarkable history.
Speaking of wonderfully unusual relatives, meet the red-lipped batfish, Ogcocephalus darwini, a Galápagos fish with scarlet lips, walking fins and a face that looks permanently unimpressed.
Discover its extraordinary evolutionary story in our Fossil Huntress article, RED-LIPPED BATFISH: THE FISH THAT WALKED INTO A BEAUTY SALON.
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