What Do Pet Octopuses Eat? Feeding Schedule, Prey Choices, and Nutrition Basics

Most octopuses kept in captivity are carnivores that eat marine invertebrates and small animal prey. Across aquarium and husbandry references, common food items include crabs, shrimp, clams, mussels, squid, and pieces of marine fish. For giant Pacific octopuses, aquarium care guidance specifically notes that crabs make up much of the natural diet and that crustacean-rich feeding supports good growth.

As a rule, crustaceans are a strong staple because they are lean, protein-rich, and closer to what many octopus species are built to process. Fish can be part of the menu, but a fish-heavy diet may add more fat than ideal for some octopus species. Rotating several prey types is usually more helpful than feeding the same item every day.

Good routine options often include raw crab, shrimp, clam, mussel, scallop, squid, and other marine shellfish from a reliable source. If your octopus accepts non-live food, target feeding with a stick can make meals easier to monitor and can reduce waste in the tank. Aquarium guidance for giant Pacific octopuses also notes that shell-off foods may be eaten more completely, which can make cleanup easier.

Occasional live prey may be used for enrichment in some setups. Public-aquarium references describe live crabs, clams, crayfish, shrimp, and some fish as enrichment foods that encourage stalking, drilling, pouncing, and problem-solving. That said, live feeding is not automatically required in every home setup, and it should be discussed with your vet or aquatic specialist because prey safety, parasite risk, legality, and tank sanitation all matter.

There is no one feeding schedule that fits every octopus species. In aquarium husbandry, giant Pacific octopuses may stop taking food once they are full, with satiety estimated at about 2% of body weight per day, and juvenile research cited in the same manual found good growth at about 3% of body weight every 3 days on a low-fat diet. Smaller tropical species commonly kept in home aquariums are often offered food once daily or every other day, then adjusted based on appetite, leftovers, and body condition.

A practical starting point is to offer a modest meal in the evening, since many octopuses are more active at night. Juveniles usually need more frequent feeding than adults. If food is consistently ignored, remove it promptly and review water quality, temperature, stressors, and life stage with your vet.

Octopus nutrition is still less defined than dog, cat, or reptile nutrition, but available husbandry literature points in a clear direction: high-protein, lower-lipid foods appear to support growth better than fattier diets. The AZA giant Pacific octopus care manual states that low-fat food, especially crustacean protein, is preferable and notes that octopods appear to use fats and oils less efficiently than lean protein.

That is why variety matters. Feeding only one seafood item can leave nutritional gaps, while rotating crustaceans, bivalves, and squid can better mimic natural prey diversity. Your vet may also suggest reviewing iodine exposure, trace minerals, and prey sourcing if your octopus has chronic appetite issues or poor body condition.

Many octopuses can learn to take thawed raw seafood, which is often more practical than sourcing live prey year-round. Aquarium food-handling guidance recommends keeping frozen seafood solidly frozen, thawing it slowly in the refrigerator, keeping it cold during preparation, and discarding thawed food not used within 24 hours. Thawing under water is discouraged in the same guidance because nutrients can leach out.

Avoid seasoned, cooked, breaded, or oil-packed seafood. Grocery-store shellfish may be acceptable in some cases if it is plain, raw, marine-sourced, and handled safely, but feeder quality varies. When in doubt, ask your vet or aquatic specialist which suppliers are safest for your species.

A healthy octopus usually shows interest in prey, explores the tank, and leaves behind predictable waste rather than large amounts of untouched food. Repeated refusal of favorite foods, sudden hiding, weight loss, weak grip, poor hunting response, or cloudy water after meals can all signal that the plan needs adjustment.

Not every appetite change means illness. Stress after shipping, a new environment, breeding status, senescence, or poor water quality can all reduce feeding. Still, because octopuses can decline quickly, a meaningful appetite change is a good reason to contact your vet promptly.

Food costs vary a lot by species, size, and where you live in the United States. For a smaller home-kept octopus, a realistic monthly food cost range is often about $60-$180 if you are using a mix of frozen marine shrimp, squid, clam, mussel, and occasional crab. For larger species or for pet parents using frequent live crab or specialty marine prey, monthly feeding costs can climb to about $200-$500 or more.

Those numbers do not include the indirect cost of feeding, such as extra filtration media, water changes, cleanup tools, or losses from uneaten prey. Because octopuses are messy eaters, nutrition and tank maintenance are tightly linked.