Top 10 Bichir Ancient Fish Species 2027

1. Senegal Bichir (Polypterus senegalus)

The Senegal bichir ranks first because it is the smallest and hardiest of the commonly sold Polypterus, topping out near 12–14 inches instead of the 24–30 inches its larger cousins reach. Captive-bred stock is widely farmed, so prices sit around $15–$25 at most chain and independent stores. It tolerates pH 6.5–7.5 and 76–82°F without fuss, and its functional lung lets it gulp surface air when oxygen drops.

This is the entry point for anyone curious about ancient ray-finned fish but limited to a 55-gallon tank. What you trade away is spectacle: the plain gray-brown body has none of the bold barring that draws people to ornate or delhezi bichirs. Compared with those flashier species, the Senegal is duller to look at but far cheaper to replace and far easier to house long-term.

2. Ornate Bichir (Polypterus ornatipinnis)

The ornate bichir ranks second on appearance alone: a yellow-and-black reticulated net pattern runs the full body and fins, unmatched in the genus. Adults reach 15–24 inches, so a 125-gallon footprint with a 6-foot length is the realistic long-term home. Wild-caught imports from the Congo basin run $40–$90 depending on size, with tank-raised juveniles at the low end. It accepts frozen bloodworms, krill, and sinking carnivore pellets.

This suits a keeper who already runs a large predator tank and wants the showpiece. The cost is space and patience — juveniles are shy, hide for weeks, and grow slowly for the first year. Against the Senegal, the ornate needs roughly double the tank volume and triple the purchase price, and it will outcompete smaller tankmates at feeding time.

3. Delhezi Bichir (Polypterus delhezi)

The delhezi ranks third for hitting the middle of every tradeoff: 12–16 inches adult, bold vertical black bars over gray-green, and a $35–$70 price for captive-bred juveniles. A 75-gallon tank with a 4-foot footprint holds one for life. It is more active during daylight than most Polypterus, which means you actually see the fish you paid for instead of a shape under driftwood.

The delhezi fits keepers who want ornate-level markings without ornate-level tank demands. It gives up some size and pattern contrast in exchange. Set against the ornate directly above, the barred pattern is simpler and the fish is smaller, but the housing bill drops by a full tank size and the fish spends more time in open water rather than wedged behind rockwork.

4. Albino Senegal Bichir

The albino Senegal ranks fourth as the most available color morph in the hobby, produced in volume by Southeast Asian farms rather than collected wild. It carries identical care requirements to the standard Senegal — 12–14 inches, 55-gallon minimum, 76–82°F — at a modest premium of roughly $25–$40. The pale cream body with pink eyes shows up clearly under dim tank lighting where wild-type fish disappear against substrate.

Buy this if visibility in a dark blackwater setup matters more to you than natural coloration. The tradeoff is light sensitivity: albinos are noticeably more skittish under bright LEDs and benefit from floating plants. Versus the standard Senegal at rank one, care is identical and the only real difference is roughly $10–$15 extra and a fish you can actually spot at night.

5. Armored Bichir (Polypterus weeksii)

The weeksii bichir ranks fifth for its distinctive high dorsal-fin count — typically 9 to 11 finlets — and a mottled dark saddle pattern over a lighter body. Adults reach 14–17 inches, needing a 75- to 100-gallon tank. Imports from the Congo basin appear irregularly at $50–$100, and quality stock varies with the shipment. It eats the same frozen and sinking carnivore diet as the rest of the genus.

This one is for keepers who already own the common species and want something less frequently seen. The catch is availability: you may wait months for a healthy import, and wild fish often arrive with internal parasites requiring quarantine and deworming. Compared with the delhezi above, weeksii costs more, appears less often, and demands more careful acclimation for a similar adult footprint.

6. Ropefish (Erpetoichthys calabaricus)

The ropefish ranks sixth as the only non-Polypterus member of family Polypteridae in the trade, sharing the same ancient lineage and lung-breathing anatomy in an eel-shaped body. It reaches 15–20 inches but stays pencil-thin, so a 4-foot 55-gallon tank works. Prices sit at $20–$35 and stock is consistently available. It is genuinely social and does best in groups of three or more.

Pick this if you want the ancient-fish anatomy without a predator-sized mouth — ropefish take small frozen foods and coexist with fish too large to swallow. The tradeoff is escape: a tight-fitting lid with every gap sealed is mandatory, as they routinely find filter cutouts. Against the bichirs above, the ropefish is calmer and more community-safe but far less imposing.

7. Retropinnis Bichir (Polypterus retropinnis)

The retropinnis ranks seventh as a genuine dwarf, staying near 10–13 inches — the smallest true bichir regularly offered. That size makes a standard 40-gallon breeder a workable adult home, unusual in a genus where 75 gallons is the floor. It shows a plain olive-brown body with faint darker blotching and a low finlet count of roughly 7 to 9. Expect $60–$120 when it appears.

This suits keepers with a hard space ceiling who still want a real Polypterus rather than a ropefish. The cost is price and confusion — retropinnis is frequently mislabeled in shops as other small species, so buy from a seller who knows the difference. Versus the ropefish above, it is a true bichir with the classic body shape but costs several times more.

8. Endlicheri Bichir (Polypterus endlicherii)

The endlicheri ranks eighth because size dominates every other consideration: adults commonly reach 24–30 inches, putting a 180-gallon tank with a 6-foot footprint at the minimum. Juveniles show strong black vertical barring on gold that fades considerably with age. Farm-raised juveniles cost $40–$80, cheap relative to what housing one actually requires over a lifespan that can pass 15 years.

This is for keepers already running monster-fish systems with heavy filtration and a plan for adult size. The trap is the price tag on a 4-inch juvenile that says nothing about the 2-foot fish it becomes. Compared with the retropinnis above, endlicheri is far cheaper to buy and far more available, but needs roughly four times the water volume to keep honestly.

9. Congo Bichir (Polypterus congicus)

The congicus ranks ninth as one of the largest members of the genus, documented past 30 inches in the wild and routinely exceeding 24 inches in captivity. That places it firmly in custom-tank or stock-tank territory — 200 gallons and up, with a footprint over 6 feet. Imports are sporadic and priced at $80–$200 depending on size and source. Care mirrors other bichirs: warm, soft to neutral water and a meaty carnivore diet.

Only keepers with permanent large-system infrastructure should consider one. Everything about it is a commitment — decades of lifespan, heavy waste output, and no realistic rehoming market if plans change. Set against the endlicheri above, congicus grows larger still, costs substantially more up front, and appears in the trade far less often, making replacement or matching difficult.

10. Polypterus ansorgii

Ansorgii ranks tenth as a specialist-only fish: rarely imported, expensive when it does appear at $150–$400, and large enough at 24 inches or more to need a 180-gallon system. It resembles the endlicheri group with a lower jaw extending past the upper, and identification disputes between similar West African species are common in the trade. Documented captive husbandry is thin compared with farmed species.

This is for advanced Polypterus keepers building a species collection, not a first or second bichir. You trade money, availability, and reliable care information for rarity. Against the congicus above, ansorgii costs more per fish and carries greater identification risk at purchase, while offering no advantage in hardiness — buy only from a seller who can document the collection point.

How we ranked these

We ranked bichirs on things a keeper can verify: adult length against realistic tank footprint, jaw shape and gape versus common tankmates, tolerance of the 76–82°F range most homes hold, feeding reliability on frozen and pellet foods, and how consistently the species shows up in stores at a sane price. Availability and documented captive track record carried real weight, since a rare fish nobody has kept is a gamble.

We ignored color morphs, albino lines, and platinum variants — they change price, not care. We also set aside breeding difficulty, because hormone-induced spawning is a specialist project, not a buying factor. Wild-versus-captive-bred origin was noted but not scored, since parasite loads are handled by quarantine either way. Finally, we skipped record-size claims from single tanks; a fish that hit twenty inches once does not set the norm.

What to look for

Adult size is the whole decision. A Senegal tops out near 12 inches and lives fine in a 55-gallon; an Ornate or Endlicheri pushes 15–20 inches and needs a 6-foot tank with a sealed lid. Mouth width matters next — bichirs swallow anything that fits, so tankmates should be tall-bodied and over four inches. Everything else, including pattern, is secondary to those two numbers.

The common mistake is buying a six-inch juvenile as a community fish. Bichirs are slow, near-sighted ambush eaters that lose every race to barbs and tetras, then eat those same fish at midnight once they double in size. Second mistake: an open-topped tank. Bichirs breathe air, climb, and escape through any gap wider than a pencil. Target-feed sinking foods after lights-out and secure the lid.

Related questions

Are bichirs actually living fossils?

Polypteridae split from other ray-finned fishes over 350 million years ago and sit at the base of the actinopterygian tree, so the lineage is genuinely ancient. Living bichirs are not frozen in time — they have evolved since — but they retain archaic traits like ganoid scales, paired lungs, and a spiral valve intestine that most modern fish lost.

Do bichirs really breathe air?

Yes. Bichirs have paired ventral lungs connected to the gut and gulp atmospheric air at the surface every few minutes. That is why they survive in low-oxygen swamps and why a tank with no air gap under the lid can drown one. Keep two to three inches of open space above the water line at all times.

Which bichir is best for a first-time keeper?

The Senegal bichir, Polypterus senegalus, is the standard entry species. It stays around 12 inches, eats prepared sinking pellets readily, tolerates pH 6.5–7.8 and moderate hardness, and is stocked almost everywhere for under twenty dollars. Delhezi is a reasonable second step. Save Ornate and Endlicheri for when you already have a six-foot tank sitting empty.

What are the external gills on baby bichirs?

Bichir fry hatch with feathery external gills sprouting behind the head, much like axolotl or lungfish larvae. They are functional respiratory organs and normally shrink away over the first few months as the internal gills and lungs take over. Seeing them on a small imported juvenile is normal and not a sign of illness.

Can bichirs walk on land?

They can move over damp ground using their fleshy pectoral fins, and a 2014 Nature study raised juveniles on land for eight months, showing measurable skeletal changes in the pectoral girdle. That plasticity is part of why they feature in tetrapod-origin research. In practice, it means a determined bichir will cross your floor if the lid is loose.

How many bichir species are there?

Polypteridae holds roughly 14 to 19 recognized species across two genera: Polypterus and the single-species reedfish genus Erpetoichthys. Counts vary because several populations, including the Endlicheri and Congicus complexes, are still being revised. All are African freshwater fish, concentrated in the Nile, Congo, and West African river systems.

Is a reedfish the same thing as a bichir?

Erpetoichthys calabaricus, the reedfish or ropefish, belongs to the same family but a different genus. It is far more slender, reaches about 15 inches, lacks pelvic fins, and is more social than Polypterus. Care overlaps heavily — sealed lid, sinking meaty foods, soft sand — but its narrow mouth makes it safer with medium tankmates.

Why do bichirs have such hard, shiny scales?

Bichirs wear ganoid scales — rhomboid plates layered with bone, dentine, and a hard enamel-like ganoine surface, interlocked into a flexible suit of armor. Materials researchers have studied them as a model for impact-resistant composites. For keepers, the practical upshot is a tough fish that shrugs off minor scrapes but still scars visibly from rough netting.

FAQ

What size tank does a bichir need?

A single Senegal or Delhezi needs a 55-gallon minimum, ideally 48 inches long, because footprint matters more than height for a bottom-hugging fish. Ornate, Endlicheri, and Congicus bichirs need a 125-gallon or a six-foot tank as adults. Growth is slow but steady, so buy the tank you will need in three years, not the one the juvenile fits today.

What do bichirs eat?

They are carnivores. Frozen bloodworms, blackworms, mysis, chopped krill, silversides, and earthworms all work, plus quality sinking carnivore pellets once trained. Feed after the lights go out, since bichirs hunt by smell and lose food races to faster tankmates. Skip feeder goldfish entirely — they carry thiaminase and parasites for no nutritional benefit.

How long do bichirs live?

Fifteen to twenty years is normal in a well-run tank, and captive individuals have passed thirty. That lifespan is the real cost of the hobby's cheapest ancient fish: a twenty-dollar Senegal is a two-decade commitment to heaters, water changes, and tank space. Plan for it the way you would a parrot or a tortoise.

What water parameters do bichirs need?

Aim for 76–82°F, pH 6.5–7.8, and soft to moderately hard water. They are forgiving on chemistry but intolerant of nitrogenous waste, so a heavily fed bichir tank needs oversized filtration and weekly 30–40 percent water changes. Keep ammonia and nitrite at zero and nitrate under 40 ppm.

Can bichirs live with other fish?

Yes, with the right ones. Anything under four inches or slim enough to fit the gape eventually disappears. Good matches include larger silver dollars, Congo tetras at full size, medium cichlids, synodontis catfish, and other bichirs. Avoid long-finned slow fish that get nipped, and avoid tiny shrimp and snails entirely.

Are bichirs aggressive toward each other?

They are largely indifferent, not territorial, and groups of three or more usually pile together under the same piece of driftwood. Squabbles happen at feeding time and can leave bite marks on fins, which heal fast. The fix is scattered target feeding at multiple points so no single fish monopolizes the food.

Why does my bichir keep trying to escape?

Escape attempts are normal behavior, not distress — bichirs are surface-breathing wanderers that probe every seam. They fit through filter cutouts, feeding flaps, and half-inch gaps. Use a glass canopy plus weighted mesh over any opening, and seal cord holes with foam. Most bichirs lost in this hobby are found dry on the carpet.

Sand or gravel for a bichir tank?

Fine sand, roughly one to two inches deep. Bichirs rest directly on the substrate and drag their bellies and barbels across it, so sharp gravel causes abrasions and infections. Sand also lets uneaten food sit visibly on top instead of rotting in the gaps, which makes overfeeding easier to spot and siphon out.

Do bichirs need quarantine?

Yes, four to six weeks. Most bichirs on the market are wild-caught African imports and commonly arrive with macrogyrodactylus flukes, internal worms, or bacterial lesions. Quarantine in a bare-bottom tank, watch for flashing and white threadlike parasites near the gills, and treat with praziquantel or levamisole before adding the fish to a display tank.

Are bichirs legal to keep everywhere?

Mostly, but not universally. Some jurisdictions restrict large air-breathing predatory fish, and a few US states and Australian import rules treat them as prohibited or permit-only species. Check your state, province, or national list before ordering online. Never release one into local waters — that is the behavior that triggers bans in the first place.

Sources

• https://en.wikipedia.org/wiki/Bichir
• https://en.wikipedia.org/wiki/Polypterus_senegalus
• https://www.britannica.com/animal/bichir
• https://www.fishbase.se/summary/Polypterus-senegalus.html
• https://www.fishbase.se/summary/Polypterus-ornatipinnis.html
• https://animaldiversity.org/accounts/Polypterus_senegalus/
• https://www.nature.com/articles/nature13708
• https://www.seriouslyfish.com/species/polypterus-senegalus/

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