Polypterus

Polypterus key facts

Care level

Intermediate

Lifespan

15-20 years

Size

20-70cm (varies by species)

Temperature

25〜28℃

Diet

Frozen bloodworms, shrimp, small fish, pellets

Tank

Size depends on species — 60-120cm

Temperature

25-28°C

Escaping

Comes to surface for air — seal all gaps

Diet

Carnivorous — sinking food at night

Notes

Poor vision, finds food by smell — feed at night

About Polypterus

Polypterus traces its origins to the Devonian period some 360 million years ago and is found across tropical rivers and wetlands from the Nile basin to Central and West Africa. The name means "many fins," a reference to the row of isolated spiny finlets running along the back that give the fish its unmistakable silhouette. The body is armored in hard, rhomboid ganoid scales, lending an almost prehistoric, dragonlike appearance. A primitive paired lung allows Polypterus to breathe atmospheric air directly, an extraordinary biological trait that enables survival in oxygen-poor waters. In temperament they are generally calm, with little intense territorial aggression among individuals of similar size, though their nocturnal lifestyle means daytime activity is limited and patience is rewarded. The genus encompasses a wide range of species, from the compact Polypterus senegalus to the impressive Polypterus bichir bichir, offering plenty of variety for collectors. Combining remarkable hardiness and longevity with an ancient, otherworldly presence, Polypterus continues to captivate aquarists around the world.

7 things to know before welcoming a Polypterus

1. 1Size Varies by Species

   Adult size varies widely by species, from around 20 cm for smaller types to over 70 cm for larger ones. Always research the maximum size of the specific species before purchasing, and plan your tank size accordingly. Small species need at least a 60 cm tank; large species require 120 cm or more.

2. 2Escape Artists

   Polypterus can use their pectoral fins to crawl and are notorious escape artists, slipping through surprisingly small gaps. While their air-breathing ability lets them survive briefly out of water, desiccation is dangerous. Always use a tank with a secure, well-fitting lid.

3. 3Nocturnal Behavior

   Being nocturnal, Polypterus spend much of the day hiding in driftwood, rock caves, or other shelters. Feeding after lights-out typically produces a better feeding response. Providing multiple hiding spots helps reduce stress and encourages natural behavior.

4. 4Poor Vision, Strong Nose

   Polypterus have very poor eyesight and rely primarily on their sense of smell to locate food. This makes scented foods like frozen bloodworms and shrimp highly effective. Strong water currents can disperse food odors and reduce feeding, so maintain a gentle flow in the tank.

5. 5Choosing Tank Mates

   Polypterus will eat any fish or shrimp small enough to fit in their mouth. While generally peaceful toward their own kind, significant size differences can lead to the smaller fish being attacked. If keeping with other species, choose peaceful bottom dwellers that are noticeably larger than the Polypterus.

6. 6Water Quality Needs

   While Polypterus are relatively adaptable, they are sensitive to ammonia and nitrite spikes. As carnivores, they produce significant waste, so aim for weekly water changes of about one-third of the tank volume. Maintain a water temperature of 24–28°C and a slightly acidic to neutral pH.

7. 7Long-term Commitment

   Polypterus can live 15–20 years under proper care, making them a genuine long-term commitment. Larger species require tanks of 120 cm or more along with powerful filtration, resulting in higher initial costs. Carefully consider your available space and ongoing maintenance expenses before committing to these long-lived fish.

Frequently asked questions about Polypterus

Q.Can I keep multiple Polypterus together?

A.Keeping multiple individuals together is possible as long as they are similar in size. A significant size difference puts the smaller fish at risk of being eaten, so aim for no more than a one-third difference in body length. Providing one shelter per fish helps minimize territorial conflict.

Q.Is it okay to keep the tank without a lid?

A.Keeping a Polypterus without a lid is dangerous. They are capable of climbing out of the tank using their pectoral fins, and many fatalities occur overnight before the escape is noticed. A tight-fitting lid with no gaps is an absolute requirement.

Q.Can Polypterus be trained to eat pellets?

A.Most individuals can be gradually trained to accept sinking pellets such as Hikari Carnivore. Start by mixing pellets with frozen bloodworms and slowly increase the pellet ratio over time. Results vary by individual, and some fish may never fully transition to dry food.

Q.What are the main differences between small and large species?

A.Small species like P. senegalus stay around 30 cm as adults and can be kept for life in a 60 to 90 cm tank. Large species such as P. endlicherii or P. bichir bichir can exceed 60 cm and require tanks of 120 to 180 cm with powerful filtration. Choose a species that matches your available space and budget.

Q.How long do Polypterus live?

A.With proper care, Polypterus commonly live 15 to 20 years or more. Setting up appropriate tank size, filtration, and feeding routines from the start is key to a long, healthy life. Be prepared for a long-term commitment before bringing one home.

Useful tools for Polypterus care

Learn more about Polypterus in the encyclopedia

Polypterus related articles

More in this category