Pictus Catfish Care Guide

The pictus catfish is a fast, restless, silver-and-spotted river predator with whiskers that trail past its tail - and two traits that decide everything about keeping it. First, if a tankmate fits in its deceptively large mouth, it is food; second, its locking, mildly venomous fin spines snag in nets and sting like a wasp, so you handle it with a container, never a net. Sold as a friendly community catfish, it is really a 12-13 cm shoaling hunter that needs a 4-foot tank and respect.

Pictus Catfish at a glance

The sourced figures the welfare engine uses to judge Pictus Catfish — the parseable key facts.

Where it comes from

Pictus catfish come from the Amazon and Orinoco basins of Colombia, Venezuela, Peru and Brazil, living in shallow, flowing waters over sandy or muddy substrates - open, current-swept riverbed and channels rather than a planted leaf-litter creek. That biotope dictates the setup. An open flowing-river origin means it wants swimming length, brisk well-oxygenated flow and clean water, not a cluttered nano. A sandy bottom means fine sand or smooth rounded gravel to spare those long barbels. And being an active mid-river predator means it is built to chase food down and roam at speed - a high-energy hunter, not a sit-still scavenger. Note the name traps: 'angelicus cat' properly means the unrelated African Synodontis angelicus, and Leiarius pictus is a 60 cm monster that shares the species name - neither is this fish.

Did you know?

• Those barbels can extend past the tail fin - among the longest relative to body size of any common aquarium catfish - sensory organs for hunting in dim, murky water.
• It is a mildly venomous fish hiding in plain sight: the friendly community pictus carries a bee-sting-grade venomous dorsal spine that few hobbyists realise is there.
• The name is a triple trap - 'angelicus cat' actually means an African Synodontis, 'pictus' is shared with the 60 cm Leiarius pictus, and it is nothing to do with dyed 'painted' fish.
• It can live a surprisingly long time - typically 8-10 years, but FishBase records an 18-year captive specimen.
• Essentially every pictus on sale is wild-caught or farm-raised, never bred in the home aquarium, which is unusual for such a common community fish. IUCN status is Least Concern.

Tank size — and why

A 4-foot (120 cm) tank, about 55 US gallons, is the practical floor for a single pictus, and longer is explicitly better. The driver is swimming length, not bioload alone: this is a fast, powerful, restless swimmer that needs a horizontal lane, and a short or tall tank stresses it regardless of volume. Crucially, that 55-gallon figure houses one fish - and because the pictus is a shoaling species, a real group needs much more. Aquariadise scales it to roughly 75 gallons for two, 100 for three, 125 for four and 150-plus for five or more, with the floor for a small shoal around 75 gallons. Typical adults reach about 12-13 cm of body (FishBase's 11 cm is a museum max-record), and well-fed fish can push toward 15 cm, all before you count the barbels. Plan for a big, long footprint up front - the cute 8 cm juvenile grows fast, reaching full size within roughly 8-12 months.

As a guide, a 55-gallon tank comfortably suits a starter group of about 4 Pictus Catfish. As floor-dwelling shoalers they want bottom area, not water column, so a bigger group or added tankmates pushes you toward a larger footprint rather than fitting in alongside.

How big does it really get?

Full-grown Pictus Catfish reach about 12.7 cm (5 in) long, but they are usually sold at only about 2.5 cm (1 in) — a typical shop size (estimate). At full size, Pictus Catfish needs roughly a 55-gallon tank, about 122 cm long; a common 10-gallon starter kit is only about 51 cm.

Adult size is sourced; the shop size is a typical-juvenile estimate; tank length is approximate for a standard 55-gallon aquarium.

Water parameters in practice

A community-tropical fish: aim for about 24-27 C, within a 22-28 C tolerance, with FishBase and Seriously Fish giving a conservative 22-25 C and hobby keepers running warmer. Chemistry is more forgiving than its blackwater origins suggest - soft, near-neutral water is ideal (wild pH around 5.8-6.8) but it adapts across pH 6.0-8.0 and hardness from very soft to moderately hard. The real constraint is water quality, not the exact number: a heavy meaty diet and high waste output mean it needs a mature, well-filtered, well-oxygenated tank with diligent maintenance. As a scaleless catfish it is also more sensitive than scaled fish to medications - dose copper and ich treatments conservatively.

Diet & feeding

A carnivore in the wild, taking small fish, insects, crustaceans and worms. In the tank it is unfussy and accepts sinking carnivore pellets, catfish wafers and good flake, but it thrives on meaty foods - live or frozen bloodworm, tubifex, blackworm, earthworm, brine shrimp and the like. It feeds mainly at dusk and night, hoovering food off the bottom and chasing it through open water with a fast, greedy appetite. The standing risk is overeating: Seriously Fish advises feeding adults sparingly, even every few days, because a greedy fish plus a meaty diet plus high waste equals polluted water and an obese, short-lived catfish. It is not an algae eater and should never be relied on to clean up after others.

Gear & setup

A long tank with a secure, heavy lid is essential - these are fast, powerful swimmers that launch out of open tanks. Run brisk, well-oxygenated flow and oversized filtration to cope with the heavy bioload. Use fine sand or smooth rounded gravel to protect the barbels, and arrange driftwood roots, branches and smooth stones to mimic the river while keeping an open central swimming lane. The fish is shy in bright light and bolder in dimmer, shaded conditions. One piece of 'gear' is really a handling rule: keep a rigid container or cup by the tank for moving the fish, and never a net.

Temperament & behaviour

Toward fish too big to eat, the pictus is peaceful - not a fin-nipper and not territorially aggressive in the usual sense (though it can get a little territorial as it matures, managed by group-keeping and space). The danger is predation, not temper. It is a shoaling species that is far more outgoing and active in a group of six or more; kept singly it becomes a shy, hidden, nocturnal ghost you rarely see. More fish and more length produce a confident, daytime-visible shoal. The defining compatibility fact is simple and load-bearing: if it fits in the mouth, it is food, especially after dark - the pictus has a deceptively large mouth and will pick off bite-size tankmates at night.

Group & social needs

A shoaling fish, despite often being sold and kept as a solitary specimen. Seriously Fish calls for six or more; hobby consensus accepts three to four as a working minimum. Keep at least three or four, ideally six-plus, in a tank long enough to support them - a lone pictus is viable but a poorer, more stressed, more hidden life. The practical limit is space: a real shoal needs a big tank, so group size and tank size have to be planned together.

Compatible tank mates (preview)

The engine clears no fish into a clear top set with Pictus Catfish. It is not a species you can stock from a generic "peaceful community" list — shrimp, snails and small community fish are not safe defaults with it, so work from the temperament and tank-mate guidance in the sections above (and the full compatibility checker) rather than a quick shortlist.

This engine-cleared shortlist is Pictus Catfish's tankmate surface for now — a dedicated tank-mates guide can follow for high-demand species.

Breeding & sexing

Effectively not achievable in the home aquarium. Sexing is difficult - adult females are reportedly slightly stockier or rounder and males more streamlined, but there is no reliable external marker. Commercial supply is wild-caught or pond-raised on farms using hormones and space the hobbyist cannot replicate, so essentially every pictus you can buy is wild-caught or farm-raised, never home-bred - unusual for such a common community catfish.

Lifespan

Plan for roughly 8-10 years with good care, the figure most hobby sources cite, with FishBase giving a more conservative average of 4-8 years and recording one exceptional specimen that lived 18 years. Short lives almost always trace to an undersized tank, poor water from a heavy meaty diet, overfeeding, or injury from netting and handling.

Common mistakes

• Using a net. The locking spines snag and tangle in the mesh and can break off, injuring the fish - move a pictus with a rigid container or cup, never a net.
• Stocking it with small fish, shrimp or snails. Neons, guppies, embers, chili and micro rasboras, dwarf shrimp, fry and even small corydoras all disappear, especially at night - which is why every bite-size species is vetoed from this fish's tankmate preview regardless of a coarse size match. The engine flags it as a small-fish predator but has no swallow-size threshold set, so this list is the safety net.
• Underestimating the tank. A 'cute' 8 cm juvenile grows fast to 12-13 cm and needs a 4-foot, 55-gallon-plus tank for one (more for a shoal), with open swimming length.
• Keeping a single fish in a small tank, which leaves it shy, hidden, nocturnal and stressed - it wants a group and space.
• Overfeeding a greedy fish on a heavy meaty diet, which pollutes the water and makes the fish obese; portion-control adults.
• Dosing copper or medications at full strength - it is scaleless and must be treated conservatively.

Signs of trouble

• Hiding even when kept in a group, with clamped fins - usually too small or too short a tank, or poor water.
• Loss of appetite, which is unusual for this greedy fish and an early warning worth taking seriously.
• Rapid or laboured gilling - check oxygen and flow; this is a high-oxygen river fish.
• White spots with flashing or scratching - ich, which needs conservative, scaleless-safe dosing.
• Tankmates going missing overnight - not illness but predation; the pictus is eating bite-size fish after dark.

Is this fish right for you?

Do not buy a pictus catfish if your tank is under about 4 feet / 55 gallons, if you want to keep a community of small fish, shrimp or fry, if you have soft long-finned or timid tankmates you can't rehouse, or if you are a beginner not ready for a large, fast predator with a hazardous spine. Beginner-suitability is genuinely disputed - FishBase and Seriously Fish frame it as not recommended for home aquariums, while some care blogs call it easy - but given the size, the predation and the spine, treat it as not-for-beginners. And never net it: handle with a container to protect both the fish and yourself.

Bringing one home

Handle it on arrival with a rigid container, never a net - the spines snag and break in mesh and can sting you. Quarantine new stock in a mature, well-oxygenated tank, watch for ich and bacterial signs, and remember that as a scaleless fish it needs conservative medication doses. Acclimate gently to a fully cycled tank; its sensitivity to poor water makes an immature filter a real risk for such a heavy-waste fish.

Common questions

Will a pictus catfish eat my other fish?

Yes, if they fit in its mouth. It has a deceptively large mouth and hunts at night, so neon tetras, guppies, embers, chili and micro rasboras, dwarf shrimp, fry and even small corydoras are at real risk. Keep it only with robust fish too big to swallow - roughly 5 inches and up.

How do you catch or move a pictus catfish?

With a rigid container or cup, never a net. Its locking dorsal and pectoral spines snag and tangle in net mesh and can break off, injuring the fish, and they can also sting you - the wound is likened to a bee or wasp sting.

Are pictus catfish venomous?

Mildly, yes. The dorsal and pectoral fin spines deliver a bee-sting-grade venom that is painful but not medically dangerous for most people, typically stinging for tens of minutes to a few hours. Deep punctures carry an infection risk, so clean them and seek attention if needed.

Can you keep one pictus catfish alone?

You can, but you shouldn't. It is a shoaling fish that is shy, hidden and nocturnal when solitary, and far more active and visible in a group of three to four or more (six-plus is ideal) - provided the tank is long enough to support them.

What size tank does a pictus catfish need?

A 4-foot, roughly 55-gallon tank is the floor for a single fish, prioritising swimming length over height. Because it should be kept in a group, a small shoal needs about 75 gallons and up - around 100 for three, 125 for four, 150-plus for five or more.

How big do pictus catfish get?

Typically about 12-13 cm of body length, with well-fed fish pushing toward 15 cm, plus very long barbels on top. They grow fast, reaching full size within roughly 8-12 months, so the small juvenile in the shop is not what you are housing for long.

Sources & confidence

Sources & confidence (1 species)

These back the Pictus Catfish figures and the previewed tank mates above. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.

• Pictus Catfish Pimelodus pictus — Aquariadise (aquariadise.com/pictus-catfish); Aquarium Source high confidence

Care-guide sources (7)

This guide synthesises the references below; where they disagree, the range and the disagreement are noted in the text above. The figures in the key-facts box are read from the TankStocking species database (v2026.06). Full welfare model on the methodology page.

• FishBase - Pimelodus pictus — authority (Steindachner 1876), family Pimelodidae, max 11.0 cm TL, temp 22-25 C, pH 6.0-8.0, dH 5-19, Amazon/Orinoco range, trophic 3.2, IUCN Least Concern, minimum aquarium 120 cm / 'not recommended for home aquariums', lifespan avg 4-8 yr (one 18-yr specimen)
• Seriously Fish - Pimelodus pictus — habitat (shallow flowing waters over sand/mud), ~12 cm SL, tank 120x45x45 cm, temp 22-25 C, pH 5.8-6.8, dH 1-15, meaty diet + overeating caution, 'shoaling... group of six or more', predatory on small fish, robust tankmates, spine wound 'akin to bee or wasp', Synodontis confusion, not bred in captivity
• Wikipedia - Pimelodus pictus — Steindachner 1876, 11 cm TL, Amazon/Orinoco, prefers soft water, eats small fish like neon tetras 'depending on catfish size', 'mildly venomous sting... dorsal spine... generally harmless to humans', spines 'pierce plastic bags and get caught in nets', Angelicus/Leiarius name confusion
• Aquariadise - Pictus Catfish Care Sheet — max 5 in (12.7 cm), min 55 gal (longer over taller), temp 74-81 F, pH 6.0-7.5, keep in a small shoal, tank-per-fish scaling (75/100/125/150 gal), meaty diet/not algae eaters, avoid small fish & cories, sharp spines snag nets, sexing hard, not bred in captivity, not for beginners
• Aquarium Source - Pictus Catfish 101 — ~5 in max, lifespan 'between 8 and 10 years', min 55 gal, temp 75-80 F, pH 7-7.5, dH 5-15, shoaling, meaty diet, predatory on much smaller fish, sharp pectoral fins/forked tail cut & snag nets
• AquariumStoreDepot - Pictus Catfish Care Guide — 3-5 in (13 cm), full size in 8-12 months, 'groups of 3 to 6' (4+ recommended), 'If it fits in a pictus catfish mouth, it is food', anything under 2 in at risk, container-not-net handling, serrated spines snag nets, temp 75-82 F, pH 6.5-7.5, ~75 gal for a shoal
• WebMD Pets - What to Know About Pictus Catfish — 5-6 in (12.7-15.2 cm), lifespan 8-10 yr, 'spiny dorsal fin... mildly venomous and can sting upon touch', eats neon-tetra-sized fish ('deceptively large mouth'), groups of three or more, 55-75 gal min (150 gal for 3-5)

More on Pictus Catfish

Related guides on TankStocking — each scored by the same welfare engine as the planner.

This care guide is a sourced planning reference, not veterinary advice — individual fish, filtration and maintenance all matter. Cycle the tank, test your water, and observe your fish. How TankStocking works →