Endlicheri Bichir Care Guide: Keeping the Saddled Dinosaur

Species Overview#

The endlicheri bichir (Polypterus endlicherii) is one of the few fish in the hobby that genuinely deserves the "living fossil" label. Bichirs as a family have been swimming around in essentially their current form for over 100 million years, predating most of the fish you see at the local store by an evolutionary eternity. The endlicheri is the heavyweight of the group — a thick-bodied, snake-like predator that grows to two feet of muscle and bone-plated armor and lives long enough to outlast a typical car loan.

This is not a beginner fish. It is a commitment to filtration, floor space, lid weights, and a freezer drawer dedicated to silversides. But for hobbyists who want a piece of prehistoric Africa in their living room, nothing else in the freshwater world looks or behaves quite like a saddled bichir cruising the substrate at midnight.

Adult size

24-30 in (60-76 cm)

Lifespan

10-15 years

Min tank

75 gallons (180+ long-term)

Temperament

Predatory, semi-territorial

Difficulty

Intermediate-Advanced

Diet

Carnivore (nocturnal hunter)

The "Saddled" Appearance: Identifying Polypterus endlicherii#

The endlicheri gets its common name "saddled bichir" from the dark vertical bars or saddle-shaped blotches that wrap over the dorsal ridge from juvenile through adult. The base color is a creamy gray-tan with darker olive markings, and the body is covered in thick ganoid scales — the same enamel-coated armor plating found on gars and sturgeons. Run your finger along a healthy adult and you'll feel something closer to fish-shaped chainmail than typical fish skin.

The dorsal fin is the giveaway. Bichirs carry a row of 9-14 individual finlets along the back instead of a single continuous dorsal fin, which is one of the easiest field marks for separating Polypterus endlicherii from a true eel or a ropefish. The head is broad and flat, the lower jaw extends slightly past the upper (a feature that distinguishes endlicheri from the closely-related ornate bichir, where the jaws are roughly even), and the eyes are small and set high on the head — adaptations for an ambush predator that spends most of its life on or near the substrate.

Juveniles also display external feathery gills behind the head, a holdover from their amphibian-like larval stage. These typically resorb by 4-5 inches of body length, but seeing them on a healthy young specimen is one of the small rewards of buying an endlicheri small and growing it out yourself.

Size Expectations: Preparing for a 24-30 Inch Predator#

Most captive endlicheri tap out between 22 and 26 inches, though wild specimens from the Nile, Chad, and Niger river basins routinely push past 30 inches and have been documented as long as 35. That captive ceiling is not a reassurance — it is a warning that 24 inches of thick-bodied predator needs serious infrastructure.

Compare this to the smaller delhezi bichir at 14-16 inches or the senegal bichir at 12 inches and the math becomes obvious: the endlicheri is roughly twice the size and four times the volume of the entry-level Polypterus species. If you cannot commit to an eventual 6-foot tank, buy a smaller bichir species instead.

Lifespan: A 10-15 Year Commitment#

A well-cared-for endlicheri lives 10 to 15 years in captivity, and 18-20 year specimens are not unheard of in dedicated monster-fish setups. This is roughly the lifespan of a medium-sized dog, and the planning required is similar — a fish you buy at age 25 may still be with you at 40. Almost all premature deaths in this species come from one of three causes: jumping out of an unsecured tank, choking on inappropriately-sized prey, or chronic poor water quality from undersized filtration.

Water Parameters & Tank Requirements#

Endlicheri are physically tough — their gilled labyrinth-like swim bladders let them tolerate hypoxic water that would kill most fish — but their bioload, size, and tendency to launch themselves through any opening larger than a credit card make tank planning the single most important decision in keeping one alive.

Minimum Tank Size: Why a 75-Gallon is Only the Beginning#

A 75-gallon (48" x 18" x 21") is the absolute minimum for a single juvenile endlicheri up to about 18 inches, and it is a temporary solution. By the time the fish hits 20 inches, you need a tank with at least 24 inches of front-to-back depth so the bichir can turn around without scraping its sides on the glass. A 6-foot, 180-gallon (72" x 24" x 24") is the realistic long-term home for one adult; pairs or trios need 240 gallons or more.

Length matters more than height with this species. Bichirs are bottom-dwellers — vertical water column above the first 12 inches is functionally wasted on them. Prioritize footprint over depth every time.

Ideal Parameters: Soft Water (pH 6.0-7.5) and Tropical Temps (77-86°F)#

Endlicheri come from warm, slow-moving African rivers and are built for the high end of the tropical range.

The species is tolerant of most municipal tap water within these ranges. What matters is stability and oxygenation — keep temperatures consistent, change at least 30% of the water weekly, and avoid the common rookie mistake of running a single hang-on filter for a fish that produces this much waste.

Substrate and Decor: Sand vs. Gravel and the Importance of Hiding Spots#

Use fine sand. Pool filter sand or aragonite-free play sand both work. Bichirs walk on their pectoral fins along the substrate, and coarse gravel will abrade their bellies and can be accidentally ingested when they strike at food — a lodged piece of gravel in the gut is one of the more common preventable killers of captive Polypterus.

For decor, prioritize large smooth stones, pieces of driftwood arranged into caves, and at least one cave large enough for the adult fish to fully enter and turn around. Avoid sharp slate edges, broken terra-cotta with hard corners, and anything with mesh or netting that could snag the bichir's gill plates during a nighttime panic dash. Plants are optional and largely cosmetic — endlicheri will uproot stem plants while hunting and ignore most others.

Filtration and Lids: Managing High Bio-load and Preventing Escapes#

Filter for at least 6-8x the tank volume per hour, and use canister filters or sumps rather than hang-on backs. A 180-gallon endlicheri tank should run two large canisters or a properly-plumbed sump rated for 250+ gallons. Over-filtration is essentially impossible with this species; the meat-heavy diet produces enormous amounts of waste.

The lid is non-negotiable, and it is where most first-time owners fail.

Diet & Feeding#

The endlicheri is an obligate carnivore with a head built for hunting — wide gape, sharp teeth, and a sense of smell that compensates for poor eyesight. Feed accordingly.

Transitioning from Live Foods to High-Protein Pellets#

Wild-caught and freshly-imported endlicheri often arrive trained on live foods (feeder fish, earthworms, blackworms) and refuse anything else for the first several weeks. The goal is to transition them to a sustainable mix of frozen meaty foods and high-quality sinking carnivore pellets within the first 30-60 days.

The standard technique is to fast the bichir for 3-4 days, then offer a thawed silverside scented with a drop of garlic juice. Once accepting frozen, gradually introduce sinking pellets (Hikari Massivore, Northfin Predator, or similar) by mixing them with the frozen food. A fully pellet-trained adult is far easier to maintain long-term than one that requires constant feeder fish — and it eliminates the very real risk of disease transmission from store-bought feeders.

Best Meaty Foods: Tilapia, Silversides, and Earthworms#

The ideal long-term diet rotates between several protein sources to provide nutritional variety. Frozen silversides and shrimp are the staples; tilapia fillet (cut into bite-sized chunks) provides leaner protein; nightcrawlers and red wigglers are excellent occasional treats that most bichirs will absolutely demolish. Avoid mammalian protein sources like beef heart and chicken — bichirs cannot efficiently process the saturated fats, and chronic feeding leads to fatty liver disease.

Adults eat 3-4 times per week, with one fast day weekly to prevent constipation. Juveniles under 8 inches can be fed daily. Portion size should leave the belly visibly rounded but not bloated — a good adult meal is two large silversides or one nightcrawler-sized worm.

Nighttime Feeding Habits: Catering to a Nocturnal Hunter#

Endlicheri are crepuscular to nocturnal, meaning their hunting instincts kick in at dusk and through the night. If you feed during bright midday tank lights, you will lose most of the food to faster diurnal tank mates. Drop food into the tank an hour after lights-out, or invest in red moonlight LEDs that the bichir cannot see — this lets you watch the hunting behavior, which is genuinely one of the most interesting things in the freshwater hobby, without disrupting it.

Tank Mates & Compatibility#

The endlicheri is not aggressive in the cichlid sense — it does not chase, hold territory in the water column, or harass fish that ignore it. But it is a 24-inch predator with a wide mouth and zero hesitation about eating anything that fits, and it can be territorial with other bottom-dwellers competing for cave space.

Selecting Large Dither Fish: Silver Dollars and Tinfoil Barbs#

The best tank mates are large, fast, mid-to-upper water column fish that are too big to be swallowed and too quick to be caught. Tinfoil barbs at 12-14 inches are a classic choice — they school in the open water above the bichir's hunting zone, add visual motion to an otherwise slow tank, and serve as "dither" fish that signal to the bichir that the environment is safe. Silver dollars work similarly. Other proven options include large tiger oscars, adult jack dempseys, green terrors, clown knifefish, and adult iridescent sharks (in tanks 240+ gallons).

Bottom-Dweller Conflict: Avoiding Territorial Issues with Other Bichirs#

Bichirs can be kept with other bichirs, but the dynamics depend on tank space. In a 180-gallon or larger, you can safely keep 2-3 endlicheri (or mix endlicheri with other large Polypterus species like ornate bichirs). Below that, expect chronic face-biting, fin nipping, and food competition that stresses the subordinate fish. The "saddled dinosaur" looks placid, but two males in a small cave will absolutely chew each other up over real estate.

Avoid mixing endlicheri with smaller bichir species like the senegal — the size difference makes the smaller bichir a meal candidate within a year of growth.

The "If it Fits, it's Food" Rule: Incompatible Small Species#

Anything that fits in the bichir's mouth will eventually be eaten. This includes neon tetras, cardinal tetras, cherry shrimp, otocinclus, small corydoras, juvenile livebearers, and any fish under about 4 inches at the time of introduction. The endlicheri does not need to chase — it waits, opens its mouth, and inhales. A school of expensive tetras will be a one-week buffet.

Monster Fish Growth Timeline#

Stunting is the silent killer of captive endlicheri, and it almost always traces back to undersized housing during the rapid juvenile growth window. Here is the timeline most hobbyists are not warned about at the point of sale:

• Months 0-6 (4 to 8 inches): Fastest growth phase. A juvenile fed properly will gain roughly half an inch to an inch per month. A 40-gallon breeder is acceptable temporary housing only during this window.
• Months 6-12 (8 to 14 inches): The fish doubles in size. By month 12, a 55-gallon is too small — the bichir cannot turn around without bending its spine against the glass. This is when most LFS returns happen, when the owner realizes the "small dinosaur fish" is now the length of their forearm.
• Months 12-24 (14 to 20 inches): Growth slows but does not stop. The 75-gallon you may have upgraded to becomes the new bottleneck. A 125-gallon (72" x 18" x 22") is the realistic next step.
• Years 2-4 (20 to 26 inches): The fish reaches sexual maturity and approaches adult size. A 180-gallon (72" x 24" x 24") is the long-term minimum; a 240-gallon (96" x 24" x 24") is comfortable.
• Years 4+ (full adult): Growth tapers to a fraction of an inch per year. The infrastructure investment is essentially complete — provided the tank was sized correctly.

The trap is the "I'll upgrade later" promise. Most owners do not, and the fish pays for it with a shortened lifespan and visible spinal curvature.

Common Health Issues#

The thick scales and air-breathing physiology of endlicheri make them resistant to many common aquarium ailments, but two specific problems show up often enough to deserve their own section.

External Parasites: Dealing with Macrogyrodactylus polypteri (Flukes)#

Bichir-specific monogenean flukes (Macrogyrodactylus polypteri) are extremely common on wild-caught and recently-imported endlicheri. Symptoms include excessive surface gulping, flashing against decor, white slime patches on the body, and clamped finlets. These flukes are species-specific to Polypterus and can persist on a host for years if untreated.

The standard treatment is praziquantel at 2.5 mg/L, dosed weekly for 3 weeks. Quarantine all new bichirs for at least 6 weeks and treat prophylactically — the alternative is introducing flukes to your display tank and battling them indefinitely.

Physical Injuries: Treating Scrapes from Sharp Decor or Jumps#

Bichirs are powerful, panicky fish in confined spaces. They will scrape themselves on sharp rocks during nighttime hunting bursts and routinely damage their snouts by ramming the tank glass when startled by sudden lights or movement. Most minor scrapes heal within 2-3 weeks at clean water and stable parameters. Use methylene blue or aquarium salt at 1 tbsp per 5 gallons to prevent secondary infection on deeper wounds.

If your bichir has visible white fungus on a wound, the underlying cause is almost always poor water quality — tighten up your maintenance schedule before reaching for medication.

Where to Buy & What to Look For#

The endlicheri market splits cleanly into two camps: wild-caught imports from West Africa and captive-bred specimens from a handful of dedicated breeders.

Inspecting Fins and Eyes at Your Local Fish Store (LFS)#

Before paying for any endlicheri, do this 60-second inspection at the tank.

A healthy endlicheri at the LFS should respond to your hand near the glass — even a sleeping bichir will twitch its finlets. A fish that lies motionless with clamped fins is either critically ill or in such advanced shipping stress that recovery is unlikely.

Wild Caught vs. Captive Bred: What to Expect#

Most endlicheri in the trade are wild-caught from the Nile, Chad, or Niger basins. They are usually larger (8-12 inches) at point of sale, more genetically diverse, and almost always carry parasites that require quarantine and praziquantel treatment. Captive-bred specimens are less common, smaller (4-6 inches typical), more expensive per inch, and arrive parasite-free if from a reputable source.

For most hobbyists, wild-caught is the practical choice — but build the 6-week quarantine into your purchase plan. Skipping it almost guarantees flukes in the display tank.

Quick-Reference Cheat Sheet#

The endlicheri bichir is a long-term investment in floor space, filtration, and freezer-foods rotation — but for hobbyists who want a genuinely prehistoric predator that interacts with you at feeding time and lives long enough to become part of the household, no other freshwater species delivers the same experience.