Senegal Bichir Care Guide: Keeping the Dinosaur Bichir (Polypterus senegalus)

If you've ever wanted a fish that looks like it swam straight out of the dinosaur age, the Senegal bichir is about as close as the freshwater hobby gets. With its eel-like body, armored scales, and a row of little spiny fins down its back, Polypterus senegalus is a living fossil — a hardy, primitive predator that's been around essentially unchanged for tens of millions of years.

At Tropical Treasures here in Cheyenne, the Senegal bichir is one of our go-to recommendations for folks who want something big, unusual, and full of personality without stepping all the way up to a true monster fish. This guide covers everything we tell customers in the store: tank setup, water parameters, that famous appetite, tankmates, and the quirks that make bichirs so much fun to keep.

Senegal bichir at a glance 📋

The Senegal bichir (Polypterus senegalus), also called the dinosaur bichir or "dino eel," is a primitive ray-finned fish native to the rivers, swamps, and floodplains of Africa. Adults typically reach 12–14 inches in the aquarium, they're long-lived (10–15 years or more), and they have a remarkable trick: they can breathe air at the surface thanks to a primitive paired lung, which lets them survive in low-oxygen water that would kill most fish. They're nocturnal, near-sighted, and hunt mostly by smell.

Tank size & setup 🌿

Because bichirs are long and heavy-bodied rather than tall, floor space matters more than height. A single Senegal bichir needs a 75-gallon tank as a realistic long-term minimum, and bigger is always better — if you're planning a multi-fish predator setup, look at our best fish for a 6-foot aquarium and large tank stocking guides for ideas.

Give them a soft sand or smooth gravel substrate (they nose around the bottom constantly), plenty of caves, driftwood, and PVC tubes for hiding, and dim lighting to match their nocturnal habits. The single most important piece of equipment is a tight, heavy lid with no gaps — bichirs are notorious escape artists and will absolutely slither out of any opening, including cord cutouts. Keeping a big tank stable takes work, so our large aquarium maintenance guide is worth a read before you set one up.

Water parameters 💧

Bichirs are famously forgiving, which is part of why they're such a great oddball for intermediate keepers. Aim for a temperature of 76–82°F, a pH in the 6.5–7.5 range, and soft to moderately hard water. Their air-breathing ability makes them tolerant of less-than-perfect oxygen levels, but that's no excuse to skimp — stable, clean water and regular changes still keep them healthiest. Avoid copper-based medications, which primitive fish like bichirs are sensitive to. New to the hobby? Our roundup of common aquarium mistakes covers most of what trips people up.

Diet & feeding 🍚

Bichirs are carnivores and enthusiastic predators, but they're slow, methodical hunters that find food by smell rather than sight. That means you can't rely on a fast tankmate-style feeding free-for-all — make sure your bichir is actually getting its share. They do best on meaty foods: sinking carnivore pellets, frozen bloodworms, earthworms, krill, and the occasional bit of fish or shrimp.

For a staple, sinking carnivore sticks like Hikari carnivore sticks or Hikari Minivore Delite work well, and you can browse more options in our sinking pellet collection. Our Hikari food guide breaks down which formulas suit big predators. Feed a few times a week — adults don't need daily feeding — and watch their waistline, since bichirs will happily overeat.

Temperament & tankmates 🤝

Senegal bichirs are surprisingly peaceful toward fish too big to eat — they're predators, not bullies. The golden rule is simple: anything that fits in that mouth is food. Avoid small fish, shrimp, and slim species, and pair them with robust tankmates of similar size.

Good companions include larger, peaceful-to-semi-aggressive fish like bigger cichlids (see our frontosa care guide and the African cichlid collection), large plecos like the common plecostomus (browse the plecos collection), and other big catfish. For more oddball companions with similar care needs, the black ghost knife and golden ghost knife are nocturnal showpieces, and the hardy panda garra is a tough little algae eater — though watch that even mid-sized fish can become a snack as your bichir grows. Browse the full oddballs collection to see what pairs well.

Breeding 🥚

Breeding Senegal bichirs in the home aquarium is uncommon and challenging, though it does happen more than with many oddballs. In the wild, spawning is triggered by seasonal rains and rising water levels; in captivity, hobbyists who succeed usually condition a healthy pair, then simulate the rainy season with cooler, softer water changes and dense plant cover. The male wraps his anal and pelvic fins into a cup to fertilize eggs the female scatters among plants. Raising the fry is the hard part. For most keepers, the bichir is best enjoyed as a fascinating long-term display fish rather than a breeding project.

Common care notes ⚠️

Three things cause most bichir headaches, and all are avoidable. First, escapes — a loose lid is the number-one way people lose these fish, so seal every gap. Second, underfeeding in a community — because they're slow and find food by smell, faster tankmates can snatch every bite before the bichir reaches it; target-feed if needed. Third, eating their tankmates — when in doubt, assume anything smaller will eventually disappear. They're otherwise tough as nails and very disease-resistant, but remember their copper sensitivity when treating the tank.

Is the Senegal bichir right for you? 🤔

If you want a hardy, prehistoric-looking predator with tons of personality, the Senegal bichir is one of the most rewarding oddballs in the hobby — it's forgiving of water conditions, long-lived, and endlessly entertaining to watch hunt. It's a great fit for intermediate keepers with a big tank who want something different from the usual community fish. It's less ideal if you only have a small tank, keep tiny community species, or can't commit to a secure lid and a decade-plus of care.

Right now our Senegal bichir (Polypterus senegalus) is between shipments, so check the new arrivals page for restocks. In the meantime, we usually have other striking oddballs in stock — like the black ghost knife, the golden ghost knife, and the panda garra — so browse the full oddballs & unique fish collection to see what's swimming today.

The bottom line

The Senegal bichir is a hardy, prehistoric predator that brings serious wow-factor to a big tank without the demands of a true monster fish. Give it floor space, a locked-down lid, meaty foods, and tankmates too big to swallow, and you'll have a fascinating dino-eel for ten years or more. Stop by Tropical Treasures in Cheyenne (307-369-1118) and we'll help you pick out the right oddball and the gear to keep it thriving.