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Ornate Pimelodus
Pimelodus ornatus
📍 South America
The Ornate Pimelodus is a striking, large-growing South American catfish known for its bold black and white spotted patterning. It is an active, fast-moving species that is best suited for spacious aquariums with robust tankmates. Though visually impressive, it requires experienced care due to its size, speed, and predatory nature toward smaller fish.
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Care Guide
Diet
The Ornate Pimelodus is a carnivore that thrives on high-protein foods such as sinking carnivore pellets, frozen bloodworms, krill, earthworms, and chopped shrimp. It is an opportunistic predator and will consume any fish small enough to fit in its mouth. Feed once or twice daily, offering only what can be consumed within a few minutes to maintain water quality.
Behavior
This species is highly active, particularly at dusk and dawn, and will patrol the lower and middle regions of the tank with impressive speed. It can be kept singly or in groups, though groups require very large tanks to reduce territorial skirmishes. It is generally peaceful with similarly sized tankmates but will readily eat smaller fish and invertebrates.
Breeding
Breeding Pimelodus ornatus in captivity is extremely rare and has not been reliably documented in home aquaria. In the wild, they are believed to be open-water egg scatterers that migrate to spawn during seasonal floods. Hormonal injection techniques used in commercial fish farming would likely be required to induce spawning.
Tank Mates
Large enough to avoid predation and shares similar water parameters
Robust cichlid of comparable size that can hold its own
Armored catfish that is too large and spiny to be eaten
Large pleco that occupies similar zones but is well-armored
Fast-moving, large schooling fish that is difficult to predate upon
Large, active South American species sharing compatible water conditions
Common Diseases
Ich (White Spot Disease)
Small white spots resembling grains of salt on body and fins, flashing, lethargy
Raise temperature gradually to 28-30 C, treat with ich-specific medication; use half-dose with caution as catfish are sensitive to medications
Columnaris
White or grayish patches on skin, frayed fins, ulcerations, rapid gill movement
Broad-spectrum antibacterial treatment such as kanamycin or nitrofurazone; improve water quality and reduce stress
Hole-in-the-Head Disease
Pitting or erosion on the head and lateral line, loss of appetite, lethargy
Improve diet with varied nutrition, perform frequent water changes, treat with metronidazole if parasitic involvement is suspected
Anchor Worm / External Parasites
Visible thread-like parasites attached to skin, redness, irritation, flashing
Manual removal with tweezers followed by topical antiseptic; treat tank with diluted potassium permanganate or appropriate antiparasitic medication
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Quick Facts
- diet
- Carnivore – sinking pellets, frozen meaty foods, earthworms, shrimp
- lifespan
- 10-15 years
- max size
- 36 cm (14 in)
- tank size
- 180 gallons minimum
- temperament
- semi-aggressive
Water it likes
- ph
- 6.0-7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 2-15 dGH
- temperature
- 72–82°F (22–28°C)