All About the Blobfish: The World’s Ugliest Fish

Leave a comment / / Updated on: 15th October 2023

Scientific namePsychrolutes marcidusWeight2 kilograms (4.4 pounds)
Pronunciationblahb-fish.Length30 centimeters (11 inches)
ClassificationActinopterygii, Scorpaeniformes, Psychrolutidae LocationWorldwide

The Blobfish

Blobfish | Liliya Butenko via iStock

Many animals are famous for being cute and cuddly. 

But the blobfish is one of the few known for its bizarre and ugly appearance. 

It appears frequently on the list of ugliest animals because it looks like a pink gelatinous blob with a droopy face, sagging nose, and a large downturned mouth. 

However, the blobfish’s appearance is probably one of the most notable cases of mistaken identities in the animal kingdom. 

Contrary to popular opinion, this fish isn’t really as ugly as commonly portrayed. 

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Gage Beasley’s In-Demand Plush Toys

In fact, the blobfish looks like your typical bony fish in its natural habitat. 

It lives deep under the sea, and this high-pressure environment helps to keep its gelatinous body in perfect shape. 

So why does it look so miserable in pictures and memes? 

That’s because most photographs of this fish are taken after it has been dragged away from its natural habitat to the surface. 

Pink blobfish
A close-up photo of a blob fish that has been depressurized | Jfl12344566788 via Animal Crossing Fan Fandom

At lower pressure, the blobfish becomes an ugly pink lump due to rapid depressurization. 

This is just one of several interesting facts about the blobfish. 

In this article, we’ll explore some other fascinating facts about the blobfish, including what it really looks like, its habitat, conservation status, and its ecological or scientific importance. 

Taxonomy and Classification

Artist sketch of a bony-type fish called blob fish | Alan Riverstone McCulloch via Wikipedia Public Domain

The blobfish is a type of psychrolutid fish. 

This means it belongs to the family Psychrolutidae. 

Fishes in this family are also known as fathead sculpins, a reference to their large globular head. 

The most popular member of this family is Psychrolutes marcidus, but the name “blobfish” is sometimes used to describe other relatives of this fish in the Psychrolutidae family. 

The silver-cheeked toad fish, a family of the blobfish | Sakis Lazarides via iStock

Apart from the blobfish, the family Psychrolutidae includes several other deep-sea fish species, such as toadfishes, tadpole sculpins, and flathead sculpins. 

The blobfish is a type of ray-finned fish (class Actinopterygii). 

It belongs to the order Scorpaeniformes, which includes lionfishes and sculpins. 

The exact evolutionary history of the blobfish within the Psychrolutidae family is still a subject of ongoing research. 

However, it is believed that the fathead sculpins, including the blobfish, share a common ancestor with other sculpin species, including those found in shallower waters.

Physical Characteristics

The peculiar appearance of the blobfish | Image via NOAA/WIKIMEDIA COMMONS

The blobfish is a deep-sea fish known for its peculiar and somewhat comical appearance, which is due to a lack of rigidity typically seen in many other fish species.

This fish is well-known for its gelatinous and saggy appearance. 

Interestingly, the blobfish looks completely different underwater. 

The water pressure helps it keep its shape together, giving it a solid appearance instead of the squishy mush it is when out of water. 

In its natural environment, the blobfish is a tadpole-shaped fish.

It has a bulbous head and a tapered tail on the other end. 

The jaws of this fish are large, and it has pronounced black eyes. 

blobfish normal appearance
The normal appearance of the blobfish in its environment | Image via All Thats Interesting

The blobfish does not have scale on its body like other fish species. 

It also lacks strong bones or thick muscles, yet it can maintain a compact shape underwater due to the high pressure pressing against its body. 

This is why the blobfish’s body collapses when pulled to the surface. 

The different species of blobfish vary in size, but they’re typically less than 30 centimeters (11 inches) in length and weigh under two kilograms (4.4 pounds).

However, they often appear larger than they are due to their gelatinous bodies. 

The blobfish has a pinkish-gray color in its natural habitat, but this color may change when it is brought to the surface, turning to a darker red or pink color. 

Habitat and Distribution

The blobfish is a deep-sea species. 

It lives in the dark, cold waters of the Atlantic, Pacific, and Indian oceans. 

Psychrolutes marcidus is mainly found in the deep waters off the coasts of Australia, Tasmania, and New Zealand. 

It lives in the abyssal or bathyal zones of the ocean, typically at depths of about 2,000 to 4,000 feet (600–1,200 meters) or even deeper. 

The deep-sea habitat where the blobfish lives is characterized by the absence of light rays, frigid temperatures (often just above freezing), and tremendous pressure. 

The blobfish has evolved a wide range of adaptations to survive in this part of the ocean. 

The blob fish surviving at the bottom of the sea
The blob fish surviving at the bottom of the sea | Image via Cousteau

The pressure at the bottom of the sea where the blobfish lives is too high for most animals to survive. 

The pressure at a depth of about 3,280 feet is up to 100 times higher than the pressure at the surface.

At this depth, the swim bladder, which helps keep many fish species buoyant, would collapse, making it impractical for species like the blobfish. 

Instead of this air sac, the blobfish relies on its gelatinous body, which has a density slightly less than that of water. 

This unique adaptation makes it possible for the fish to float just above the seafloor without collapsing.

Behavior and Social Structure

The blobfish is a slow-moving fish that moves around by simply bobbing along in the water or on the sea bed. 

They stay relatively stiff, expanding very little energy as they do. 

Two blob fish mating under water
Two blob fish mating under water | Rachel Caauwe via Wikipedia CC BY-SA 3.0

Blobfish are opportunistic feeders. 

They primarily prey on small invertebrates and other organisms that live in the deep-sea environment.

There is limited information regarding the territorial behavior of the blobfish. 

However, given the vastness of their habitat, it is unlikely that they establish territorial boundaries in the traditional sense.

Blobfish do not undergo long-distance migrations like some other fish species. 

They are relatively sedentary but are capable of migrating vertically in the water column. 

It isn’t clear if the blobfish is nocturnal or more active during the day. 

ocean twilight zone
Twilight zone of the ocean | Jodi Jacobson via iStock

However, given the fact that they live in the twilight zone of the ocean, where the light level is very low, there’s practically no difference between night and day conditions. 

Although little is known about their social behavior, blobfish are generally considered solitary animals. 

They do not exhibit complex social structures, and there is no evidence to suggest that they form pairs or small groups. 

Their solitary nature is consistent with their deep-sea lifestyle. 

Resources are typically scarce and widely dispersed in this region of the ocean, which is why deep-sea dwellers often favor a solitary lifestyle. 

Diet and Feeding

The carnivorous blobfish waiting for its prey | Sicarius via Zoochat

The blobfish is a carnivore. 

It feeds on various marine organisms, including crustaceans such as lobsters and crabs, sea urchins, mollusks, and other tiny marine creatures.

But despite its diet, this fish is not an active predator because it is incapable of swift motion. 

Instead, it uses a sit-and-wait strategy, which involves waiting for prey to swim close to it before attacking. 

This strategy allows them to get food while preserving as much energy as possible. 

A blobfish waiting for its food to pass by | Image via Fishipedia

This is important for their survival since the deep marine environment tends to be nutrient deficient, which means the blobfish needs to survive on a restricted diet.

The blobfish does not have teeth, which means it cannot bite or chew its food. 

Instead, it captures small crustaceans and other prey by simply sucking them quickly into its large mouth when they swim too close. 

Blobfish can also scavenge, meaning they can eat detritus and other organic matter that falls to the sea bottom from the upper layers of the ocean. 

Reproduction and Life Cycle

fish scientists
Group of fish scientists working together | petra012015 via iStock

Scientists currently have very limited information about the reproductive behavior and life cycle of blobfish due to the challenges of studying them in their natural environment. 

Specific mating rituals and courtship displays of blobfish are not well-documented. 

But based on the behavior of other deep-sea animals, we can assume that the blobfish doesn’t need such elaborate displays to mate. 

The deep-sea environment is devoid of light, which makes visual communication difficult. 

deep-sea environment
The deep-sea environment on which the blob fish lives | Johan Holmdahl via iStock

Instead, deep-sea species like the blobfish probably rely on chemical signals and tactical cues to locate potential mates in the water around them. 

After mating, females lay eggs in a nest they make in rocky areas under the water, such as deep ocean platforms. 

They lay a large number of eggs (up to 100,000 eggs) per batch.  

Laying a large clutch of eggs like this increases the chances of survival for their offspring. 

They also lay their eggs in warmer waters. 

blobfish with eggs
A blob fish cleaning its eggs | Image via Monterey Bay Aquarium Research Institute

Female blobfish demonstrate some amount of parental care. 

After laying their eggs, they patrol the water until the eggs are ready to hatch. 

Juvenile blobfish emerge from the egg as fully-formed individuals, similar in appearance to their parents.

The blobfish has a slow rate of reproduction. 

They also grow and age very slowly. 

Experts think they can live for up to 130 years, based on a comparison with the life cycle of other deep-sea species.

Ecological Role and Interactions

Studying a blobfish is no easy thing
Studying a blobfish is no easy thing | Image via Ocean Conservancy

The exact ecological interactions of the blobfish are not well-documented because the species have not been studied extensively. 

Blobfish are carnivorous predators. 

They feed on a variety of small marine organisms present in the deep-sea environment where they live. 

As predators, the blobfish help regulate the populations of their prey species. 

This predation can prevent certain prey populations from becoming overly abundant and potentially destabilizing the ecosystem.

blobfish scavenging
The peculiar blobfish scavenging around the sea floor | Image via American Oceans

Like other deep-sea species, blobfish also act as scavengers.

They help to get rid of detritus and other organic materials that fall to the sea bottom from the upper layers of the ocean. 

Their presence in the deep-sea environment and feeding activities helps with the redistribution of nutrients. 

As they feed on small organisms and potentially scavenge carrion, they release nutrients back into the water column through waste and decomposition. 

This also has cascading effects on the entire ecosystem by influencing the distribution of other organisms and promoting microbial activities.

Conservation Status and Threats

Blobfish Fish Underwater Lush Nature by Generative AI | Louis Deconinck via Freepik

The exact conservation status of the blobfish isn’t well known. 

Scientists are not entirely sure if they’re endangered, mainly because they live in a relatively unknown deep-ocean environment. 

This makes it difficult to tell the exact population of blobfish in the wild and assess the potential threats affecting them. 

There are no known predators for the blobfish. 

Bottom-trawling is a method that threatens blob fish species | OceanProd via iStock

But they’re probably threatened by human activities like bottom trawling and deep-sea fishing. 

As cold water species, climate change and the current trend of warming oceans may also affect blobfish. 

Various conservation groups are currently investing efforts in protecting deep-sea species like the blobfish. 

One such conservation organization is the Ugly Animal Preservation Society, a group that seeks to raise awareness about the need to protect the blobfish and several other aesthetically challenged creatures. 

The blobfish is the mascot of this group because they’re less likely to be protected compared to the more adorable animals. 

Unique Adaptations and Survival Strategies

gelatinous body of the blob fish
The gelatinous body of the blob fish acts as a survival mechanism | African Food Network via Facebook

To survive in the nutrient-deficient, high-pressure environment where it lives, the blobfish has developed various adaptations and survival strategies. 

One of the most striking adaptations of this fish is its gelatinous body. 

This unique body structure makes it possible to achieve a neutral buoyancy in the deep-sea environment instead of relying on swim bladders or air sacs, which tend to be unstable in high-pressure environments. 

Using this adaptation, the blobfish can float effortlessly in the water without swimming actively. 

This adaptation helps to conserve energy in the low-food environment of the deep ocean. 

The blobfish’s body is also adapted to withstand the high-pressure conditions of the deep sea. 

The semi-translucent, pale pink or reddish coloration of this fish is a type of camouflage. 

The blobfish blends seamlessly with the surrounding water, making it less conspicuous to prey and predators in the dimly-lit seabed. 

Cultural Significance and Human Interactions

Blobfish captured
Blobfish captured | Image via Allthatsinteresting

The blobfish is a relatively unknown fish species.

It was discovered for the first time in 1983 and has only been caught a few times since then.

Sightings and observations in their natural habitat are also infrequent. 

Yet, the blobfish has managed to accrue some level of culture largely due to its unusual and distinctive appearance. 

The popularity of this fish is primarily driven by the internet and popular media. 

blob fish internet sensation
A photo of blob fish wearing a beautiful flower crown that has gone over the internet | Image via Hugging Face

The blobfish gained widespread recognition in the early 2010s when it was humorously dubbed the “World’s Ugliest Animal” in a public poll conducted by the Ugly Animal Preservation Society. 

This title, along with its bizarre appearance, made this fish an internet sensation, resulting in numerous memes and viral content relating to the fish. 

The goal of the campaign was to raise awareness about this fish and other “not-so-cute” endangered animals that require protection. 

Ugly animal species are less likely to be researched compared to more attractive ones. 

Still, the campaign by the Ugly Animal Preservation Society boosted the popularity of this fish species and got it some scientific attention. 

Blobfish campaign
The Blobfish campaign of the Ugly Animal Preservation Society | Image via Buzzle

In the wild, encounters between blobfish and humans are quite rare. 

However, they’re sometimes caught intentionally as bycatch in deep-sea trawl fisheries targeting other commercially valuable species. 

Unlike other fish species, the blobfish is not edible because it has an extremely acidic flesh and a gelatinous body. 

Consequently, the blobfish is not a direct target of commercial fisheries. 

However, they are still impacted by accidental encounters as well as the habitat destruction caused by these fishing practices.

Future Prospects and Research

The blobfish live deep under the sea, which makes studying them quite difficult. 

As a result, studies or research documenting the behavior and attributes of the blobfish aren’t very common. 

However, thanks to more recent advances in deep-sea exploration technology, scientists are now exploring and documenting the deep-sea environment more comprehensively to understand the blobfish and other deep-sea species. 

Genetic research on deep-sea organisms, including the blobfish, is also ongoing. 

blob fish
A scientist studying the unique physciological and biochemical adaptations of the blob fish | African Food Network via Facebook

These studies hope to uncover more insights into the evolutionary relationship of these species and how the adaptations that help them survive in their ecosystem were developed. 

Understanding the genetic makeup of these species can shed light on their unique physiological and biochemical adaptations.

Scientists are also studying the ecological roles of blobfish and other deep-sea species within their ecosystems. 

These studies will help us understand them and reconstruct the intricate food web, ecological relationships, and nutrient cycling in the deep ocean.


The blobfish has an interesting reputation as the ugliest animal in the world. 

It is a deep-sea fish species that looks like a pale pink gelatinous blob. 

But the fish looks considerably different in its natural habitat. 

The gelatinous appearance of this fish is an adaptation to survive in the otherwise deadly high-pressure environment where it lives. 

The blobfish is an underwater scavenger and carnivorous fish. 

It preys on crustaceans, mollusks, and other small marine animals that drop from the surface into its habitat. 

The blobfish has been unfairly labeled as an ugly fish, but this intentional smear campaign has helped to boost the popularity of this species and raise awareness about the need to invest efforts in their protection. 


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