
Source: Wikimedia Commons
Polypterus weeksii
A large bichir with broad dark blotches over a pale ground, found in the middle Congo. FishBase records a maximum of 54cm TL. It belongs to the upper-jawed group and is seen less often in the trade than its congeners.
Polypterus weeksii is a large polypterid from the middle Congo basin. FishBase records a maximum of 54cm TL, 9-11 dorsal finlets and a body depth 6.5 to 9.5 times in standard length. Broad dark blotches over a pale ground are its hallmark, and the body is somewhat more compressed than in most congeners. It belongs to the upper-jawed group, in which the upper jaw is as long as or longer than the lower, and Seriously Fish notes it is one of the rarer bichirs in the hobby. That site suggests a 150 x 60cm base of about 540 litres but lists temperature, pH and hardness as not recorded, and FishBase gives none either. Nocturnal and weak-sighted, it locates food by smell and eats any fish that fits in its mouth. The swim bladder serves as a lung, so surface access is essential, and a lid is needed because it escapes readily. The IUCN rates it Least Concern and it is not listed by CITES.
Source: Wikipedia (CC BY-SA 4.0)
The Mottled Bichir lives 10-15 years.
The Mottled Bichir grows to Up to 54cm TL.
Origin
Africa (middle Congo basin in the Republic of Congo and DR Congo)
Lifespan
10-15 years
Size
Up to 54cm TL
Temperature
22〜28℃
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Polypterus weeksii Boulenger, 1898
Authority databases: FishBase
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendices (species not listed) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
Meaty live and frozen foods such as prawns, earthworms, mussel and lancefish
Seriously Fish suggests a 150 x 60cm base of about 540 litres. Favour floor space, build cover from driftwood and smooth rocks over sand, and fit a heavy, gap-free lid.
Seriously Fish lists temperature, pH and hardness as not recorded for this species and FishBase gives none. With no verifiable figures, no range is quoted here.
It swallows anything small enough but is otherwise fairly peaceful. Other Polypterus, Datnioides, knifefish, larger Synodontis and Ctenopoma and medium to large characins are suitable.
Carnivorous and often refuses dried food. Offer prawns, earthworms, mussel and small fish, live or frozen. It hunts by smell and is easily outcompeted by faster tankmates.
Captive breeding has not been recorded and is presumed to follow congeners. In the wild it spawns during the rainy season, the male cupping the eggs in his anal fin, fertilising them and scattering them among plants; hatching takes three to four days.
It breathes air and will drown if it cannot surface. The external gills of juveniles are lost with growth. Imports are uncommon and newly arrived fish can be unsettled, so check that a specimen is feeding before buying. The IUCN rates it Least Concern.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The average lifespan of Mottled Bichir is 10-15 years. With proper care and nutrition, they can live a long and healthy life.
Mottled Bichir typically reaches Up to 54cm TL as an adult. Size may vary depending on care conditions and individual genetics.
Mottled Bichir feeds on: Meaty live and frozen foods such as prawns, earthworms, mussel and lancefish. Aim for a balanced diet with appropriate feeding frequency.
The price of Mottled Bichir varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 17, 2026