Octopuses: Minds, Myths and Human Entitlement

Octopuses are often described as strange, alien, mysterious animals. It is easy to see why. They can change colour and texture in a fraction of a second. They can taste through their suckers. They can squeeze through tiny spaces, open jars, carry coconut shells, use stones, escape tanks, remember humans, solve problems and move eight flexible arms with a nervous system unlike our own.

But octopuses are not aliens.

They are animals on this planet. They are not monsters from the deep, not seafood, not research tools, not aquarium decorations and not farm products. They are living, feeling individuals with their own ways of experiencing the world. The more we learn about octopuses, the weaker the excuses for exploiting them become.

Who are octopuses?

Octopuses are molluscs in the class Cephalopoda, alongside squid, cuttlefish and nautiluses. There are around 300 recognised species of octopus, found in every ocean on Earth, from shallow reefs to deep sea habitats.

They are soft-bodied animals with eight arms, suction cups, a beak-like mouth, three hearts and blue blood. Two hearts pump blood through the gills, while the third sends oxygen-rich blood through the rest of the body. They breathe through gills, not lungs, which is why being dragged from the water is not a harmless inconvenience.

Their bodies are astonishingly flexible. Without bones, octopuses can pass through spaces that look impossibly small. Their skin contains specialised cells that allow them to change colour, pattern and texture. They use this for camouflage, communication, hunting and defence. Some can make themselves resemble rocks, shells, seaweed or the surrounding seabed. Others use startling displays to confuse prey or deter predators.

Their arms are not just limbs in the way we usually think of limbs. A large proportion of an octopus’s neurons are located outside the central brain, including in the arms. The arms can explore, taste, grip, manipulate and respond with a degree of local control. This does not mean an octopus is nine separate individuals. The best evidence suggests one conscious animal with a radically distributed nervous system. One self, organised differently.

Different does not mean lesser.

A different kind of mind

Octopus intelligence did not evolve along the same path as human, dog, pig, crow or ape intelligence. Our last common ancestor with octopuses lived more than half a billion years ago. That means their intelligence is not a poor copy of ours. It is an independent answer to the problem of being alive in a dangerous world.

Octopuses have been observed using tools. Veined octopuses carry coconut shell halves across the sea floor, then assemble them as portable shelters. Some build barricades around their dens with stones and shells. In captivity, octopuses have learned to open jars, navigate mazes and solve food puzzles.

Cuttlefish, close relatives of octopuses, show episodic-like memory, remembering what they ate, where they found it and when. They can delay gratification, waiting for a preferred food rather than taking a less desired one immediately. Some studies have compared their self-control with that seen in apes, parrots and corvids.

Octopuses can recognise individual humans. There are reports of captive octopuses squirting water at particular people they appear to dislike. Others have rearranged objects in their tanks, short-circuited lights, escaped enclosures and made their way through pipes to the sea.

The famous case of Inky, an octopus held at the National Aquarium of New Zealand, is often told as a cute escape story. But the more serious point is this: animals do not escape from places they want to remain in.

They do not belong in tanks.

Sentience

Sentience means the capacity to have subjective experiences. To feel. To experience positive and negative states. To have things happen that matter to the individual they happen to.

The evidence for octopus sentience is strong. Octopuses have complex nervous systems, nociceptors, learning abilities, memory, flexible behaviour, responses to injury, wound-tending behaviours and evidence of pain-related experiences that are affected by anaesthetics and analgesics.

A major London School of Economics review, commissioned by the UK government, assessed evidence for sentience in cephalopod molluscs and decapod crustaceans. It concluded there was strong evidence that cephalopods, including octopuses, are sentient. This helped lead to their recognition under UK animal sentience legislation. That recognition matters, but it is not enough.

The UK government recognised octopuses, crabs and lobsters as sentient beings, while also making clear that existing fishing, restaurant and industry practices would not be directly affected. In other words: the law acknowledged they can feel, then allowed the systems that capture, confine, sell and kill them to continue.

The problem with calling octopuses “alien”

Octopuses are often called alien because they look and behave so differently from mammals. But that framing can be dangerous.

Calling them alien may sound like admiration, but it can also create distance. It makes them seem unknowable, unreachable, almost outside the moral circle by definition. If an animal is presented as too strange to understand, it becomes easier for humans to deny that their experiences matter.

Octopuses are not alien. They are animals. Their nervous systems are different, but difference is not absence. Their bodies are different, but difference is not inferiority. Their perception is different, but difference is not emptiness.

Humans have a habit of doing this. When an animal is similar to us, we say we can use them because similarity makes them useful models. When an animal is different from us, we say we can use them because difference makes them less morally relevant.

Either way, the animal loses.

Octopuses should not have to resemble us to be respected.

Octopuses as food

Most octopuses used for food are still taken from the wild. They are caught, hauled from the ocean, transported, sold and killed for a meal. In some places, octopuses are eaten dead. In others, they are mutilated and served while still alive.

Live-animal dishes are not culture. They are violence performed as cuisine.

Octopuses can feel pain. They can remember threatening situations. They can respond to injury. They are not ingredients with arms. They are individuals being cut, boiled, frozen, beaten, suffocated or otherwise killed because humans have decided their bodies taste good.

The global octopus trade is worth billions. Hundreds of thousands of tonnes of octopus are caught annually. As demand grows and wild catches decline, the industry is looking for the same answer it always does: more control, more confinement, more breeding, more killing. That is where octopus farming comes in.

Octopus farming

Proposals for industrial farming of octopuses should horrify anyone who understands who these animals are.

Nueva Pescanova, a Spanish seafood company, has pursued plans for a large-scale octopus farm in Gran Canaria. The facility has been reported as aiming to produce around 3,000 tonnes of octopus flesh per year, with as many as one million octopuses killed annually. It would be an underwater factory farm.

Octopuses are mostly solitary animals. Many are territorial or maintain home ranges. They rely on hiding places, complex environments, control over space, exploration and choice. A barren tank cannot provide the ocean. A crowded tank cannot provide solitude. Industrial lighting cannot replace the dimness and complexity of their natural habitats.

The industry wants to force solitary, intelligent, sensitive animals into crowded systems designed around profit. Predictably, confinement can lead to stress, aggression, injury, cannibalism and death. The reported projected mortality rate for the proposed Nueva Pescanova farm was around 10% to 15% before slaughter. Some sources discussing octopus farming and trial systems suggest mortality can be far higher.

Imagine calling any system acceptable when a significant proportion of the animals die before the killing stage.

Then there is the proposed slaughter method. Plans associated with the Canary Islands farm included killing octopuses by submerging them in freezing water or ice slurry. This method has been heavily criticised because it can cause a slow death.

There is no such thing as welfare in octopus farming. The problem is not simply the size of the tanks, the temperature of the water or the killing method. The problem is turning octopuses into farmed commodities at all.

Farming carnivores means killing others to feed them

Octopuses are carnivores. They eat crabs, molluscs, fish and other marine animals. Farming them would require feeding them other animals, often from already pressured marine systems.

A commonly cited feed conversion is around 3:1, meaning three times more feed weight may be needed than the final weight of octopus produced. In plain language: humans would kill other aquatic animals to feed octopuses, then kill the octopuses too. This is not food security.

Octopus is often sold as a premium product, not a staple food needed by people with no alternatives. The argument that octopus farming is necessary to feed the world collapses under the weight of its own absurdity. Feeding wild-caught fish to captive carnivores so affluent consumers can eat octopus is not solving hunger. It is manufacturing another market for death.

Aquaculture is frequently marketed as sustainable, but fish farms already cause pollution, disease risks, parasite issues, antibiotic use, waste discharge and pressure on wild fish populations. Octopus farms would add another layer of harm to marine life. Calling this “blue food” or “sustainable seafood” does not change what is happening. Greenwashing is still greenwashing when it happens underwater.

Octopuses in aquariums

Aquariums sell captivity as education. They invite the public to stare through glass at animals whose lives have been reduced to display. Fish, rays, sharks, crabs, jellyfish, turtles, octopuses and countless other aquatic animals are placed in tanks for entertainment, then wrapped in conservation language to make the business feel respectable.

Many aquatic animals in aquariums are taken from the wild. Some species do not breed well in captivity, so when one individual dies, another may be captured to replace them. Animals can be taken from conservation-sensitive areas, transported long distances and subjected to stress before they even reach the tank.

Octopuses are curious, exploratory, problem-solving animals. A tank, no matter how carefully decorated, is a fraction of a life. It limits movement, choice, hunting, hiding, mating, den selection and natural behaviour. It exposes them to artificial conditions, constant viewing and a world built for human convenience.

Aquariums point to intelligence when selling tickets, then ignore what intelligence means for the animal. A bored octopus is not an educational resource. A captive octopus is not an ambassador. A confined octopus is an individual whose life has been taken from them so humans can gawp at them.

Octopuses as “pets”

Octopuses do not belong in homes. Keeping an octopus as a companion animal is sometimes treated as quirky or impressive because they are so difficult to contain and care for. But that difficulty is exactly the point. They need specialised water quality, space, hiding places, stimulation, appropriate food, species-specific conditions and constant attention to environmental detail.

Even when someone thinks they are providing good care, they cannot provide the ocean.

The exotic pet trade turns living beings into status symbols. Octopuses become proof that someone is unusual enough, knowledgeable enough or wealthy enough to own someone rare. But animals are not collectibles. Being hard to keep alive is not an argument for keeping someone. It is an argument for leaving them alone.

Octopuses in research

Octopuses are increasingly attractive to researchers because their bodies and nervous systems are extraordinary. Scientists are interested in their distributed nervous systems, camouflage, regeneration, genetics, behaviour, intelligence and potential as biological “model systems.”

When humans call an animal a model, they often mean an individual can be bred, confined, manipulated, injured and killed so humans can learn something. The more interesting the animal becomes to science, the more danger they may face.

Cephalopods have been used in invasive experiments. Some research has involved injury, amputation, gene editing, confinement, behavioural testing and killing. In the United States, cephalopods have historically lacked the same legal protections given to vertebrate animals in laboratories. Campaigners and scientists have pushed for octopuses, squid and cuttlefish to be included in research welfare policies, especially because evidence of their sentience is so strong.

But “protection” in laboratories never means freedom from exploitation. It means regulated exploitation. The deeper ethical issue is not whether a lab follows a protocol before harming an octopus. The issue is whether octopuses should be treated as research instruments in the first place.

The evidence of octopus minds should lead to octopus ethics. If an animal is intelligent enough to fascinate researchers, feel pain, solve problems, remember threats and experience the world consciously, then they are not an object for human curiosity.

Octopus tourism and petting operations

Some facilities market themselves as conservation, education or research while allowing tourists to interact with captive octopuses. This is another form of exploitation dressed as care.

Kanaloa Octopus Farm in Hawaii presented itself as conservation-minded, while investigations and campaigners raised concerns about wild capture, breeding ambitions and the possibility that such facilities could pave the way for commercial octopus farming. Even when a facility is not yet producing octopus flesh, it can still normalise captivity, build industry knowledge and teach the public to see octopuses as manageable resources.

Touch tanks, petting experiences and close-contact displays are not respect. They are domination made interactive. An octopus is not a prop for human wonder.

The aquarium, lab and farm are connected

It is tempting to treat each form of octopus exploitation separately. Food is one issue. Farming is another. Aquariums are another. Research is another. Tourism is another. But they are connected by the same assumption: humans are entitled to use octopuses.

The aquarium says: we can confine them if people learn something.

The lab says: we can harm them if humans might gain knowledge.

The farm says: we can breed and kill them if consumers want the product.

The restaurant says: we can sell their bodies if there is demand.

The pet trade says: we can own them if someone can pay.

Different industries. Same mindset.

An animal rights position rejects that mindset at the root. The issue is not how nicely we exploit octopuses. The issue is that they are not ours to exploit.

Molluscs are animals

Some people try to create loopholes around aquatic animals, especially molluscs. They may say octopuses are obviously sentient but oysters are not. Or that mussels are acceptable. Or that squid are different. Or that “seafood” is somehow morally separate from other animal products.

This is what happens when people try to negotiate with a principle instead of following one.

Molluscs are animals. Octopuses, squid, cuttlefish, nautiluses, snails, slugs, clams, mussels, scallops and oysters are all animals. Their nervous systems vary enormously, and the evidence for sentience is stronger in some groups than others. But veganism is not a game of finding the least familiar animal we can still justify eating.

The most basic point remains: vegans do not eat animals.

For octopuses, the evidence is not borderline. It is overwhelming. They are sentient, conscious, intelligent individuals. They are not plants, fungi or algae. They are animals with lives of their own.

Fishing and bycatch

Octopuses are also harmed by wider fishing systems.

Commercial fishing does not only kill the target species. Nets, traps, lines and trawls kill vast numbers of non-target animals, including fish, crustaceans, sea birds, turtles, sharks, rays, seals, whales, dolphins and other marine life. Trawling drags animals across the seabed, crushes bodies, damages habitats and causes prolonged injury and death.

Octopuses can be caught directly or indirectly. Their soft bodies are vulnerable to injury. When pulled from deep water, animals can experience pressure changes, physical trauma, suffocation and violent handling.

The fishing industry measures life in tonnes. That tells us almost everything we need to know.

When animals are counted by weight rather than by individual, their personhood has already been erased.

Pollution, habitat loss and marine destruction

Octopuses do not only face direct capture. They also live in oceans shaped by human damage. Pollution from industry, agriculture, plastics, discarded fishing gear and chemical runoff affects marine habitats. Octopuses are sensitive to water quality. Polluted water can affect reproduction, immunity, development and survival. Ghost gear, discarded or lost fishing equipment, continues trapping and killing marine animals long after vessels have moved on.

Climate change alters ocean temperatures, oxygen levels and food webs. Habitat destruction removes the complex environments octopuses rely on for dens, hunting, hiding and reproduction.

Humans do not have to personally eat an octopus to participate in systems that endanger them. Our food systems, fishing industries, waste, consumer habits and political choices all shape the ocean.

But the direct use of octopuses for food, farming, research and display is one area where the ethical answer is immediate: stop.

Legal progress and its limits

Some legal progress has been made. The UK recognises cephalopod molluscs, including octopuses, as sentient beings. The EU gives live cephalopods protections in scientific research. Other countries and regions have taken steps to include cephalopods in research or animal protection rules. Washington and California have banned octopus farming, with California also banning the sale of farmed octopus. These are important developments. They show that campaign pressure works. They also show that the old claim that octopuses are unfeeling seafood has become scientifically and politically harder to defend. But legal recognition is not liberation.

An animal can be legally recognised as sentient and still be caught, confined, sold, eaten or killed. A committee can acknowledge welfare while industries continue business as usual. A law can create future review mechanisms while doing nothing for the animals currently being exploited. The animal rights movement cannot stop at recognition. Recognition must lead to abolition.

What would respect for octopuses mean?

Respect for octopuses would not mean better tanks. It would not mean more “humane” recipes. It would not mean slightly improved slaughter methods. It would not mean farming them with enrichment. It would not mean using fewer of them in laboratories.

It would mean refusing to treat them as resources.

Respect means leaving octopuses in the ocean. It means rejecting octopus farming before the industry becomes normalised. It means opposing the capture of octopuses for aquariums and pet trades. It means challenging research systems that turn sentient animals into tools. It means refusing to eat them, buy them, breed them, display them or profit from their confinement.

Octopuses do not need to be useful to us. They already matter to themselves.

What you can do

Do not eat octopus or other animals. Choose plant-based foods instead of sea life. The simplest way to stop funding the exploitation of octopuses is to stop buying their bodies.

Oppose octopus farming wherever it is proposed.

Octopus farming is still new enough to be stopped before it becomes another normalised industry. Support bans, petitions, campaigns and organisations working to prevent commercial octopus farms from being built.

Do not visit aquariums that keep octopuses and other aquatic animals captive. Education should not require imprisonment. Seeing an animal in a tank is not the same as understanding them.

Reject octopus pet ownership and exotic animal trading. Admiration is not ownership. If you love octopuses, leave them alone.

Challenge “sustainable seafood” greenwashing. Sustainability language often ignores the individual animals being used and killed. A system can be marketed as environmentally responsible while still treating sentient beings as commodities.

Share the science.

Many people still do not know that octopuses feel pain, solve problems, use tools, remember, explore and show complex behaviour. Public understanding matters, especially before new industries become entrenched.

Support stronger legal protections, but do not mistake regulation for justice. Protections can reduce some harms, but the goal should be ending exploitation, not polishing the cage.

They are someone, not seafood

Octopuses have survived for millions of years without human permission. They have evolved remarkable bodies, complex nervous systems and ways of being that should humble us.

They are not alien. They are not monsters. They are not luxury food. They are not research models. They are not aquarium exhibits. They are not farm stock waiting for the next industry to discover them.

They are curious, sensitive, intelligent marine animals with their own experiences, their own interests and their own lives.

The question is not whether octopuses are enough like us to deserve respect. The question is why humans keep treating difference as permission.

Octopuses belong in the sea, not on plates, not in tanks, not in labs, not in farms and not in our hands.

They are not ours.