“Little Is Known”: Experts Discuss Unsettling-Looking Fish Caught By Deep-Sea Fisherman

Roman Fedortsov, a Russian fisherman, shared a video of a strange-looking fish he pulled from the depths, sparking quite a bit of curiosity among social media users. 

The specimen Fedortsov placed at the edge of his boat looked like a bloated, slimy gray blob. 

However, what stunned observers the most was its peculiar face, which many likened to an alien—one that didn’t seem particularly happy to visit our planet.

“Are you chopping aliens’ heads for views?” one user joked.

“I always knew they were somewhere around,” someone else commented.

“It has a bigger brain than some people I know,” a third user chimed in, while another requested, “Ok, we saw it, now put it back.”

Deep-sea fisherman in orange gear handling nets on a boat, related to "alien" fish discovery.

Fisherman Roman Fedortsov shared one of his strangest catches with his 615,000 Instagram followers

Image credits: Roberta Sant’Anna/Unsplash (Not the actual photo)

The unique creature is a smooth lumpsucker, also known as a smooth lumpfish.

“These fish are usually found in midwater depths of the North Pacific Ocean and are not often encountered,” Dr. Todd Clardy, Collection Manager of Ichthyology at the Natural History Museum of Los Angeles County, explained to Bored Panda.

Fedortsov caught an unusually swollen smooth lumpsucker

Deep-sea fisherman holding an unusual "alien" fish with dark, mottled skin near the ocean.

Image credits: Глеб Колесников / GBIF (Not the actual photo)

These fish are so rare that the IUCN Red List of Threatened Species, which tracks the conservation status of thousands of organisms, has not yet evaluated the species, Aptocyclus ventricosus.

“That generally means that so little is known about the species that it is not possible to evaluate its conservation status.”

Smooth lumpsuckers have a high water content in their tissues and round, bulbous bodies.

Deep-sea fisherman discovers unusual "alien" fish on rusty boat surface.

Image credits: rfedortsov_official_account

But what about the viral fish’s extremely swollen appearance? The high water content in its body does not explain its uniquely bloated look, the expert said.

Nor does barotrauma, a condition in which a fish’s swim bladder expands due to pressure differences when being rapidly brought to the surface.

“When their swim bladder expands rapidly, fish can often puff up unnaturally and look very strange. 

“However, this is not the case for this fish because Aptocyclus ventricosus does not have a swim bladder. There is no swim bladder to puff up!

“I assume this is just how a large, freshly caught Aptocyclus ventricosus looks, which is pretty cool to me!”

Many netizens said the specimen looked straight out of a sci-fi film

 

View this post on Instagram

 

A post shared by Роман Федорцов (@rfedortsov_official_account)

Dr. Mark Sabaj, Collection Manager of Fishes at the Academy of Natural Sciences of Drexel University, offers a different theory. He suggests that the fish’s unusually swollen appearance may be due to something it ate.

“This particular one may have just eaten something large (like a jellyfish), and its entire body (including a belly full of jellyfish) bloated after being removed from the pressure of the ocean depths,” he told Bored Panda.

Smooth lumpsuckers live in the North Pacific Ocean and are not often encountered

Deep-sea view with sunlight filtering through water, illustrating alien fish habitat.

Image credits: Sarah Lee / Unsplash (Not the actual photo)

Map showing locations where deep-sea fishermen found unusual fish.

Image credits: GBIF / OpenStreetMap

As Dr. Sabaj noted, smooth lumpsuckers are an important part of the food chain since they’re food for sea lions, seals, and other marine mammals.

“Although its flesh is edible, it is not typically eaten by people, except for those looking for an exotic meal,” he said.

This fish’s adult maximum size is around 40 cm (15 in)

Deep-sea fisherman discovers unusual "alien" fish on sandy surface.

Image credits: Alexander Shienok / GBIF (Not the actual photo)

They’re not the best swimmers in the Pacific, but smooth lumpsuckers have a pelvic sucking disc that helps them survive after birth.

“This is where elements of the pelvic fin are fused in a way to form a suction cup,” added Dr. Clardy. “Although the adults swim around in the open water, the young live in intertidal areas where wave action can be strong. They can stick themselves to rocks with this sucking disc and stay in place in rough surf.”

Dr. Todd Clardy shared a photo of the specimen from the Natural History Museum of Los Angeles County to show how different they look from the fresh specimen Fedortsov caught

Deep-sea "alien" fish specimen on display in a laboratory setting, surrounded by jars.

Image credits: Dr. Todd Clardy/Natural History Museum of Los Angeles County

According to Dr. Ralf Britz, Head of the Ichthyology Section at the Senckenberg Society for Natural Research, the fish that Fedortsov reeled in is a mature female.

He said: “The smaller male protects the eggs until they hatch. The fish in the image is a mature female, in which ovaries can account for 40% of body mass.

“Male parental care is quite common among fishes that exhibit parental care and much more common than female parental care.

“Snakehead fishes, labyrinth fishes, blennies, sticklebacks, and gobies are just a handful of examples of fishes with male parental care.”

“We are not alone,” one social media user joked, as others compared the fish to an alien

Tweet response about an "alien" fish, reads "put it back," dated Feb 26, 2025.

Image credits: PlebeianPepe

Tweet about "alien" fish, mentioning missed calls from CIA.

Image credits: indigowife

Tweet about an "alien" fish by deep-sea fisherman, saying "Throw Yakub back! Leave my daddy alone!

Image credits: barnaclebill35

Comment on alien fish by deep-sea fisherman tweet; user dislikes the catch.

Image credits: probablynottah

Screenshot of a tweet reacting to an "alien" fish discovery by a deep-sea fisherman.

Image credits: Joe_Halloween

Tweet by Shane Donovan joking about an alien fish, mentioning "proof of the underwater aliens.

Image credits: S_D_Donovan

Tweet reaction to a deep-sea fisherman's "alien" fish with a comment about life being stranger than fiction.

Image credits: 44pers

Tweet reaction to alien fish discovery by deep-sea fisherman: "WTF is even that?!

Image credits: NavarroThinker

Tweet about deep-sea fisherman encountering 'alien' fish in the ocean.

Image credits: geralt_of_rivi

Tweet expressing concern about the third deep-sea fish surfacing in recent weeks; discussion on alien fish.

Image credits: AnonWyatt6

Tweet response about deep-sea fisherman and "alien" fish, expressing hesitance to go far into the water.

Image credits: king_wicker

Tweet about ocean exploration versus Mars, highlighting unknowns of deep-sea fish.

Image credits: MallowsToast

Social media post by Vandarte about an "alien" fish discovery, stating: "We are not alone.

Image credits: vandarte34

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