Giant Bumblebee Catfish

Quick summary

The Giant Bumblebee Catfish (Pseudopimelodus bufonius) is a nocturnal, predatory ambush catfish that demands a specialist setup rather than a standard community aquarium. Despite the word “giant” in its common name, this species reaches a modest adult size of around 24.5 cm SL, but its predatory nature means any tankmate small enough to fit in its cavernous mouth will almost certainly be eaten.

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Last researched and fact-checked: September 2026.

• Introduction
• Quick Stats
• Appearance
• Natural habitat
• Tank size and setup
• Water parameters
• Filtration and equipment
• Diet and feeding
• Behaviour and temperament
• Tank mates
• Breeding
• Common diseases and health
• Frequently asked questions
• Related guides

Introduction

Pseudopimelodus bufonius belongs to the family Pseudopimelodidae, a group of Neotropical catfishes sometimes referred to as bumblebee catfishes because of the bold dark and light banding many of them display. The species was first described by Valenciennes in 1840 and has had a long taxonomic history, having been placed in various genera over the years before settling into Pseudopimelodus.

It is worth being upfront about a significant taxonomic caveat. Pseudopimelodus bufonius has an exceptionally wide distribution across South America, and some ichthyologists have noted that it likely represents a species complex rather than a single, uniform population. What is sold under this name in the aquarium trade may therefore encompass more than one actual species, and fish from different river basins could differ in adult size, colouration, or behaviour in ways that are not yet formally described. Hobbyists should bear this in mind when comparing care advice from different sources, as writers may be describing subtly different animals.

In the UK hobby, the Giant Bumblebee Catfish appears only sporadically. It is not a bread-and-butter aquarium species, and when it does turn up at specialist retailers or import lists, it tends to arrive without detailed collection locality data. Keepers who can provide the right conditions will find it a rewarding, characterful fish with an entertaining sit-and-wait hunting style, but it is emphatically not a community fish and should only be kept by aquarists prepared to accommodate its predatory habits.

The common name “Giant Bumblebee Catfish” is something of a misnomer. At roughly 24.5 cm standard length (SL), P. bufonius is certainly larger than the popular South American Bumblebee Catfish (Microglanis iheringi), which tops out at around 6 – 7 cm. However, compared to many of the large predatory catfishes that share its habitat, such as certain pimelodids that can exceed a metre, the label “giant” is generous. The name is best understood in context: it is the giant of the bumblebee catfishes rather than a giant catfish in its own right.

Appearance

Pseudopimelodus bufonius has the broad, heavily depressed head that is characteristic of ambush predators among catfishes. The mouth is very wide and terminal, capable of engulfing prey items that seem disproportionately large relative to the fish’s body. The body is robust and somewhat cylindrical behind the head, tapering toward the caudal peduncle. Small eyes sit relatively high on the head, reflecting the species’ primarily nocturnal and benthic lifestyle.

Colouration is the feature that earns the “bumblebee” name. The body displays a pattern of bold, irregular dark brown to black bands or saddles set against a lighter tan, cream, or yellowish ground colour. The precise patterning can vary considerably between individuals, and given the likely species-complex nature of P. bufonius, fish from different geographic origins may show noticeably different markings. Some specimens have very broad, well-defined bands, while others display a more mottled or broken pattern. The fins typically carry some banding or spotting that continues the body pattern.

Three pairs of barbels are present: one pair of maxillary barbels (the longest, extending back along the body) and two pairs of shorter mandibular barbels. These are important sensory organs that the fish uses to detect prey in low-light conditions and amongst leaf litter or other benthic debris.

Sexing P. bufonius externally is not straightforward. Documented methods for reliably distinguishing males from females are sparse. In some pseudopimelodids, mature females may appear broader when viewed from above, particularly when carrying eggs, but this is a generalisation from the family rather than a well-documented observation for this specific species.

Natural habitat

Pseudopimelodus bufonius has one of the wider distributions among pseudopimelodid catfishes. It is recorded from the Lake Maracaibo basin in Venezuela and various river systems across eastern Brazil. Populations from the Magdalena and Cauca river basins in Colombia, once included under this name, were formally split into separate species (Pseudopimelodus magnus and P. atricaudus) in 2020. This is a substantial geographic range spanning several major drainage basins, and as noted above, taxonomic work suggests that what is currently called P. bufonius may actually comprise multiple distinct species across this area.

Across its range, this species is associated with slow to moderate-flowing river stretches, often in areas with soft substrates of sand, mud, or a mixture of both. Leaf litter, submerged branches, and other woody debris are key habitat features. The fish lies concealed among this material during the day, relying on its disruptive banding pattern for camouflage. When night falls, it becomes an active predator, ambushing smaller fish and invertebrates that stray too close.

Water conditions across its native range vary considerably, as one would expect from such a broad distribution. Generally, the habitats tend toward warm, slightly acidic to neutral, and moderately soft water. However, water chemistry can vary meaningfully across this species’ wide range, which is another reason to treat published parameter ranges as guidelines rather than precise requirements.

The IUCN lists P. bufonius as Least Concern, reflecting its wide range and presumed large overall population. However, the listing also notes that the taxonomic situation is unsettled, and if the complex is split into multiple species in the future, some of those newly described species may warrant separate conservation assessments.

Tank size and setup

A minimum tank size of around 350 litres (roughly 77 imperial gallons) is recommended for a single adult Pseudopimelodus bufonius. While this is not an especially active swimmer during the day, it is a solid-bodied fish that reaches approximately 24.5 cm SL, and it needs adequate floor space to set up an ambush territory. Tanks with a larger footprint (length and width) are more important than height, as this is a strictly bottom-dwelling species.

The aquascape should aim to replicate the cluttered, dimly lit benthic environment the fish occupies in the wild. A soft sand substrate is ideal. Sharp gravel or coarse substrates risk damaging the fish’s barbels, which are vital sensory organs. On top of the substrate, provide abundant cover in the form of bogwood, driftwood tangles, large pieces of cork bark, and PVC pipes or ceramic caves. The fish will select a preferred hiding spot and return to it consistently.

Leaf litter, such as dried Indian almond leaves or oak leaves, can be added both for the naturalistic feel and because it mimics the leaf-strewn river beds where this species hunts. The leaves will also leach tannins that gently acidify the water, which suits the species well. Be prepared for the water to take on a tea-coloured tint if using a generous layer of leaves.

Lighting should be subdued. This is a nocturnal fish that will be stressed and reluctant to show itself under bright illumination. Floating plants, dimmer LED settings, or a canopy of broad-leaved plants such as Anubias or Echinodorus species can all help to reduce light intensity at the substrate level. A moonlight or red-light setting on your LED unit will allow you to observe the fish during its active hours without disturbing it.

A secure, tight-fitting lid is essential. Although P. bufonius is not known as a habitual jumper, many catfishes can and do launch themselves out of open-topped aquaria, especially when startled at night.

Water parameters

The parameter ranges given above are a practical guide based on the known conditions across this species’ wide native range. In most cases, aiming for the middle of these ranges will serve well: a temperature around 24 – 26 °C (75 – 79 °F), a pH of 6.5 – 7.0, and moderate softness will suit the majority of specimens encountered in the trade.

As with most catfishes, P. bufonius is sensitive to dissolved nitrogenous waste. Ammonia and nitrite must always be at zero. Nitrate should be kept below 20 ppm through regular water changes. While this species is not especially delicate once established, newly imported specimens can be sensitive to sudden changes in water chemistry, so drip acclimatisation over at least an hour is strongly recommended when introducing the fish to its new tank.

Stability is arguably more important than hitting a precise number. Avoid large, abrupt swings in pH or temperature during water changes. Matching the replacement water to the tank temperature and chemistry before adding it will go a long way toward keeping the fish healthy and stress-free.

Filtration and equipment

Good filtration is important for any predatory fish, and P. bufonius is no exception. Predators that consume whole fish or large meaty items produce a substantial bioload relative to their size. A canister filter rated for at least 1.5 times the tank volume turnover per hour is a sensible starting point. For a 350 litre tank, that means a filter with a flow rate of at least 525 litres per hour, though more is better.

That said, this is not a species that appreciates a strong current at substrate level. In the wild, it inhabits slow to moderate-flowing areas and spends its days lying motionless among debris. If your filter’s output creates a powerful jet along the bottom, use a spray bar or lily pipe to diffuse the flow, or direct it along the back glass so that it circulates without blasting the fish’s chosen resting spots.

Mechanical filtration should be robust enough to handle the waste from meaty foods. Fine filter floss or sponges in the final mechanical stage will help keep the water clear. Biological filtration capacity is paramount: generous quantities of sintered glass media, ceramic rings, or similar high-surface-area biomedia will support the bacterial colonies needed to process ammonia and nitrite efficiently.

An air stone or secondary sponge filter can provide useful supplementary oxygenation, particularly in warmer setups where dissolved oxygen levels drop. A heater rated appropriately for the tank volume, ideally with a heater guard to prevent burns (catfishes sometimes rest against equipment), completes the essential kit. A thermometer placed away from the heater outlet gives you an accurate reading of actual water temperature.

Diet and feeding

Pseudopimelodus bufonius is an obligate predator in the wild, feeding on smaller fishes and aquatic invertebrates. Its hunting strategy is ambush-based: it lies motionless, camouflaged among leaf litter or against the substrate, and engulfs prey that comes within striking range of its enormously wide mouth.

In captivity, newly imported specimens may initially accept only live foods. River shrimp, earthworms, and small live fish (where ethically and legally appropriate) can be used to get the fish feeding confidently. The goal should be to wean the fish onto dead or prepared foods as quickly as possible. Most specimens can be trained to accept meaty frozen foods such as lance fish, whitebait, whole prawns, mussel, and large bloodworm, though the transition may require patience and persistence.

Sinking carnivore pellets or tablets are accepted by some individuals once they are settled, and these can form a useful part of the diet because they are nutritionally balanced. However, many hobbyists report that their specimens remain stubbornly wedded to whole fish or prawn-based diets and show little interest in processed foods.

Feeding should take place after lights-out, when the fish is naturally active. Dropping food near the fish’s known hiding spot in the evening usually produces the best results. Overfeeding is a risk with predatory catfishes: a well-fed adult P. bufonius may only need feeding every two to three days. Uneaten food should be removed promptly to prevent water quality deterioration.

Avoid feeding large quantities of oily fish such as mackerel, or mammalian meats such as beef heart, on a regular basis. While occasionally tolerated, these are not part of the natural diet, and the saturated fats in mammalian meat are poorly metabolised by fish, potentially leading to fatty liver deposits over time.

Behaviour and temperament

The defining behavioural trait of Pseudopimelodus bufonius is its nocturnal, sit-and-wait predatory lifestyle. During daylight hours, the fish is almost entirely inactive, lying motionless in its chosen hiding spot. It can remain so still that new keepers sometimes worry the fish is ill or dead. This is entirely normal. As the lights go off, the fish emerges and begins to patrol the substrate, investigating its surroundings with its sensitive barbels.

This is not a community fish. Any tankmate small enough to be swallowed will be eaten, and P. bufonius can consume surprisingly large prey relative to its own body size thanks to its hugely distensible mouth. Even fish that seem only slightly smaller than the catfish itself may be at risk.

Toward fish of a similar or larger size that are not potential prey, P. bufonius is generally indifferent rather than aggressive. It is not territorial in the way that some cichlids are, and it does not actively chase or harass tankmates. Aggression is almost entirely predatory rather than territorial.

Conspecific behaviour is not extensively documented. Some hobbyists have kept more than one specimen in a large tank without serious problems, while others report squabbling over preferred hiding spots. If keeping multiples, providing more hiding places than there are fish is prudent. A significantly larger tank than the single-specimen minimum would also be necessary.

The species is not especially skittish once settled into a well-furnished tank, but it will always be shy during daylight. Keepers who want to observe their fish regularly should invest in a red or blue moonlight viewing lamp, as most catfishes are less disturbed by these wavelengths.

Tank mates

Choosing tankmates for P. bufonius requires a clear-eyed assessment of what this fish does: it eats anything that fits in its mouth. Suitable companions are therefore species that are too large to be consumed, robust enough not to be stressed by sharing a tank with a predator, and tolerant of the same water conditions. Avoid small, slender, or slow-moving fish entirely.

Good tank mates

• Oscar, large and robust enough to coexist safely with a predatory catfish of this size
• Severum, a peaceful, sizeable cichlid that occupies mid-water and generally ignores bottom-dwellers
• Blue acara, a moderately sized cichlid that is too deep-bodied to be swallowed once adult
• Sailfin pleco, a large, armoured catfish that shares similar water requirements
• Common pleco, similarly well-armoured and grows large enough to be safe
• Firemouth cichlid, tough enough to hold its own once fully grown, though juveniles would be at risk
• Silver dollar, a shoaling species with a deep body, best kept in groups to spread any attention
• Geophagus, eartheater cichlids that are large, peaceful, and occupy the same general habitat zone
• Hoplo catfish, a robust, armoured species that is typically too large and tough to be eaten
• Black ghost knifefish, a fellow nocturnal species of comparable size, though tankmates should be monitored

Fish to avoid

• Neon tetra, far too small and will simply become an expensive midnight snack
• Cardinal tetra, equally tiny and defenceless against an ambush predator
• Guppy, small livebearers are ideal prey items rather than tankmates
• Endler’s livebearer, the same applies to all small livebearers
• Cherry shrimp, any ornamental shrimp will be consumed immediately
• Corydoras, too small and too slow to escape a nocturnal ambush predator
• Harlequin rasbora, small, slender, and a natural prey shape
• Dwarf gourami, small and slow-moving enough to be swallowed whole
• Celestial pearl danio, micro fish that would not survive a single night
• Otocinclus, tiny and defenceless, a textbook prey item for this catfish

Breeding

Specific, verified breeding reports for Pseudopimelodus bufonius in captivity are extremely limited. The species does not appear to have been bred with any regularity in the home aquarium, and detailed accounts of spawning behaviour, egg characteristics, or fry rearing for this exact species are not readily available in the English-language literature.

What little is known or inferred is drawn largely from general observations of pseudopimelodid catfishes rather than confirmed data for P. bufonius itself. Some members of the family are suspected to be cave or crevice spawners, depositing eggs in sheltered locations, but whether this applies to P. bufonius is not documented with certainty. It would be dishonest to present a detailed breeding protocol here when the foundational information simply does not exist in published form.

Hobbyists interested in attempting to breed this species would need to start by reliably sexing their fish, which is itself a challenge given the lack of documented sexual dimorphism. Conditioning with high-quality live and frozen foods, providing multiple cave-like spawning sites, and experimenting with seasonal water parameter changes (such as a cooler dry-season period followed by warmer, softer water to simulate the onset of the rainy season) would be reasonable strategies to try, but these are educated guesses rather than proven methods for this species.

Almost all specimens available in the UK trade are wild-caught imports. If you do manage to observe spawning behaviour, documenting it carefully and sharing it with the catfish-keeping community (for example, via PlanetCatfish) would be a valuable contribution to the collective knowledge base.

Common diseases and health

Pseudopimelodus bufonius is not known to be especially disease-prone once it is established in a suitable tank with stable, clean water. Like most catfishes, it is a scaleless species, which means it can be more sensitive to certain medications than scaled fish. Treatments containing copper, malachite green, or formalin should be used with extreme caution and at reduced doses, if at all. Always check that any medication you plan to use is safe for scaleless fish before adding it to the tank.

The most common health issues are those associated with poor water quality or inadequate diet. Bacterial infections, particularly fin rot and skin ulcers, can develop if ammonia or nitrite levels spike or if the fish sustains an injury on sharp decor. Fungal infections may follow on from untreated bacterial damage. Internal parasites are a possibility with wild-caught specimens, and a precautionary quarantine period of at least two to four weeks in a separate tank is strongly recommended before introducing a new fish to an established setup. During quarantine, observe the fish’s feeding response, body condition, and faeces for any signs of parasitic infection such as white, stringy excrement.

Barbel erosion is another concern to watch for. This is almost always caused by rough or contaminated substrate, or by persistently poor water quality. If you notice the barbels shortening or becoming ragged, test your water immediately and check the substrate for sharp edges. Provided the underlying cause is addressed promptly, barbels can regenerate to some degree, but severe erosion may be permanent. A soft sand substrate, diligent maintenance, and regular partial water changes of around 25 – 30% weekly are the best preventative measures.

Frequently asked questions

Is the Giant Bumblebee Catfish the same as the regular Bumblebee Catfish?

No. The fish most commonly sold as the “Bumblebee Catfish” in UK shops is Microglanis iheringi, a much smaller species (around 6 – 7 cm) from a different family (Pseudopimelodidae as well, but a different genus). Pseudopimelodus bufonius grows significantly larger and is a far more committed predator. The two should not be confused, and their care requirements differ substantially.

How big does a Giant Bumblebee Catfish actually get?

The maximum recorded standard length (SL) is approximately 24.5 cm. Total length including the caudal fin would be somewhat larger, probably around 28 – 30 cm. Despite the “giant” in the name, this is a medium-sized catfish rather than a true giant.

Will it eat my other fish?

Almost certainly, if they are small enough to fit in its mouth. This species has an extremely wide gape and is an efficient nocturnal ambush predator. Any fish roughly half the catfish’s body length or smaller is at serious risk. Choose tankmates carefully and err on the side of caution.

Can I keep more than one Giant Bumblebee Catfish together?

It is possible in a sufficiently large tank with plenty of hiding places, but conspecific behaviour is not extensively documented. Providing at least one cave or shelter per fish, with extras, reduces the risk of territorial disputes. A tank significantly larger than the 350 litre single-specimen minimum would be necessary.

Why does my Giant Bumblebee Catfish never move during the day?

This is completely normal. P. bufonius is strictly nocturnal and spends the daylight hours motionless in its hiding spot. It becomes active after the lights go off. If you want to observe it, use a dim red or blue moonlight lamp in the evening.

Can I keep this fish in a planted tank?

You can, though the fish itself has no interest in plants and the subdued lighting it prefers limits your plant choices to low-light species such as Anubias, Java fern, and Java moss. Hardy, well-rooted or attached plants should survive, but delicate stem plants may be uprooted by the fish’s movements during its nocturnal patrols.

Is this species endangered?

The IUCN currently lists Pseudopimelodus bufonius as Least Concern, reflecting its wide geographic range. However, the likely species-complex nature of this taxon means that individual populations within the complex could face localised threats that are not captured by the current broad assessment.

Related guides

• Bumblebee catfish
• Oscar
• Sailfin pleco
• Common pleco
• Severum
• Black ghost knifefish
• Hoplo catfish