Amazon Sailfin Catfish
Pterygoplichthys pardalis
Animalia›Chordata›Siluriformes›Loricariidae
📍 South America (Amazon basin)
The Amazon Sailfin Catfish (Pterygoplichthys pardalis) is a large, hardy suckermouth catfish — one of the fish most often sold generically as a “common pleco.” It's recognized by the bold leopard-spot pattern across its body and its tall, sail-like dorsal fin. A tireless algae grazer as a juvenile, it grows quickly to 16–20 inches, produces a heavy bioload, and rapidly outgrows smaller tanks. Peaceful and nocturnal, it does best in 125+ gallon setups with strong filtration, driftwood, and supplemental vegetables — algae alone won't sustain an adult.
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Tanks keeping this 🐟
Kept by 1 hobbyistCommunity tanks featuring Amazon Sailfin Catfish.
Care Guide
Diet
Primarily herbivorous. Offer sinking algae wafers and blanched vegetables (zucchini, cucumber, spinach) daily, with occasional protein (bloodworms, shrimp pellets) a couple of times a week. Feed after lights-out, since it's a nocturnal grazer, and don't rely on tank algae alone for an adult.
Tank Mates
Large, peaceful cichlid that shares the same water and won't bother a bottom-dwelling pleco
Fast midwater schooler that stays well clear of the bottom
Peaceful surface/mid dweller for a large tank; no overlap in zone or diet
Another peaceful large catfish; ensure the tank and filtration are sized for two heavy waste producers
Common Diseases
Ich (White Spot)
White salt-like spots on the body and fins, flashing/rubbing on surfaces, clamped fins.
Raise temperature gradually to ~30°C (86°F) and treat with a proprietary ich medication; plecos are scaleless/sensitive, so use half-dose and remove carbon during treatment.
Malnutrition / wasting
Sunken belly and 'pinched' look behind the head despite the tank having algae — algae alone can't sustain an adult.
Feed sinking algae wafers plus blanched vegetables (zucchini, cucumber, spinach) daily and occasional protein; ensure it's actually getting food after lights-out.
Skin/barbel abrasions & infection
Reddened or eroded belly, mouth, or barbels from a bare/rough substrate or aggressive tankmates.
Provide smooth substrate and driftwood, remove aggressors, keep water pristine; treat secondary bacterial infection with an appropriate antibacterial if it develops.
Nitrate stress / poor water quality
Lethargy, loss of appetite, rapid gilling — plecos produce heavy waste and foul water fast if under-filtered.
Increase filtration and water-change volume/frequency; keep nitrate under 20 ppm; do not overstock relative to the tank size.
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Quick Facts
- diet
- Omnivore, primarily herbivorous — algae wafers, blanched vegetables, occasional protein
- lifespan
- 10-15 years
- max size
- 48 cm (19 in)
- tank size
- 125 gallons minimum
- temperament
- peaceful
Water it likes
- ph
- 6.5-7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 4-18 dGH
- temperature
- 72–86°F (22–30°C)
Legality
No state or federal restrictions on record for this species.
Not legal advice, and possibly incomplete or out of date. Rules vary by state and locality and change over time — always confirm the current regulations with your state wildlife or agriculture agency before buying, keeping, or shipping this species.