At a glance the quick version
Looks how to spot one
Long, slender surface-dwelling fish with raised, split eyes
An elongated, brownish fish with a pale belly and usually three blue to purple stripes along the side. Its eyes sit high on the head and each one is divided into an upper and lower half, letting it see above and below the water at the same time. Females grow noticeably larger than males.21
Personality what they are like
A schooling fish that is usually calm with its own kind; squabbles are rare apart from heavily pregnant females.32
Daily activity how busy a day looks
Spends nearly all its time cruising at the surface, rarely diving. It is a strong jumper and will leap to catch insects.23
Grooming and care the hands-on bits
Warm brackish water around 25 to 31 °C, pH about 7.5 to 9.0 and specific gravity roughly 1.005 to 1.015. A tight-fitting lid is essential because of its powerful leap. Feeding twice a day mirrors its natural rhythm.31
Home where they are happiest
Estuaries, lagoons, mangrove coasts and mudflats. In an aquarium it needs a wide surface area rather than depth, with a base of about 150 x 45 cm and water around 15 cm deep, plus shallow or exposed areas to rest on and root-like branches imitating mangroves.123
Food basics what goes in the bowl
A generalist feeder. Wild fish eat insects, small invertebrates, small crabs and fish, algae and diatoms from the mud. In captivity it takes floating foods with spirulina, bloodworm, brine shrimp and earthworms.123
Company who they like around
A schooling species; wild groups hold 10 to 50 fish. Keep at least six, ideally a dozen or more, preferably in a species-only tank.23
The story where it all began
Linnaeus described the fish in 1758 under the genus Cobitis, and it was later placed in Anableps, from Greek words meaning 'looking up'. It is found in the aquarium trade and is also studied by scientists interested in its remarkable eyes.21
Fun facts for the dinner table
- 1
It does not really have four eyes: each eye is split into two halves with separate pupils for viewing above and below the waterline.2
- 2
Babies are born live and already measure about 4.5 to 5 cm.1
- 3
Males and females are 'left-handed' or 'right-handed', and a pair must be a matching combination to mate.2
- 4
It can stay on exposed mud at low tide and sometimes hops onto mudbanks to feed.1
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed 2020)1
- Carl Linnaeus
- Described in 1758 in Systema Naturae, first placed in the genus Cobitis2
The care rhythm a typical week and year
A typical home-care rhythm for a Four-eyed Fish. A starting point, not a vet's advice.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Salinity checkBrackish fish need a little marine salt, and some need more as they growevery week
- Water changeAbout 25% of the water, mixed to the same salinityevery week
- Water testevery week
- Filter rinseRinse in old tank water, never tap waterevery month
Owner questions the things everyone asks
How often should I feed my Four-eyed Fish?
Feed your Four-eyed Fish small amounts once or twice a day, which matches its natural rhythm. Furry Diary's starting plan suggests feeding daily, and you can adjust based on your fish's appetite and the food label's guidance.31 Pet Wiki plan
What does a Four-eyed Fish eat, and what should it never eat?
Your Four-eyed Fish enjoys floating foods with spirulina, bloodworm, brine shrimp, and earthworms. Avoid giving any food not listed in its diet, and always check with a vet or good breeder for specific concerns.123
How much space does a Four-eyed Fish need?
This fish needs a wide surface area rather than depth, with a base of about 150 x 45 cm and water around 15 cm deep. It's a schooling species, so keep at least six, ideally a dozen or more, in a species-only tank.123
What temperature, light or water does a Four-eyed Fish need?
Keep warm brackish water at 25 to 31 °C, with a pH of 7.5 to 9.0 and specific gravity of 1.005 to 1.015. A tight-fitting lid is essential because it's a strong jumper, and provide shallow or exposed areas to rest on.31
How often should I clean a Four-eyed Fish's home?
Furry Diary's plan suggests a weekly water change of about 25%, mixed to the same salinity, and a monthly filter rinse in old tank water. Test the water weekly and check salinity weekly to keep conditions stable. Pet Wiki plan
Can a Four-eyed Fish live with others?
Yes, it's a peaceful schooling fish that does best with its own kind in groups of at least six, ideally a dozen or more. A species-only tank is recommended to avoid stress, as squabbles are rare except with heavily pregnant females.32
How long does a Four-eyed Fish live?
Lifespan varies depending on care and environment, so ask a vet or good breeder for specific estimates. With proper conditions, they can live several years.
Can I handle a Four-eyed Fish?
It's best not to handle your Four-eyed Fish, as it spends nearly all its time at the surface and is a strong jumper. Use a net only when necessary, and always keep the tank covered.23
Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.
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Every fact on this page has a numbered source. Spotted an error? [email protected].
- FishBase: Anableps anableps, Largescale foureyes fishbase.seused for range, size, environment, temperature, diet, live-bearing, IUCN, author
- Wikipedia: Anableps anableps en.wikipedia.orgused for names, eye structure, colours, size and weight, behaviour, schooling, reproduction, naming
- Seriously Fish: Anableps anableps seriouslyfish.comused for tank size and depth, water parameters, lid, diet, group size, temperament
Checked 2026-09-30. Text is written in our own words from these sources.