Striped Raphael catfish

Water parameters

Tolerated range for this species. Aim for the middle of each band rather than the extremes.

Tank and habitat

Substrate: sand.

Behavior

Plant interaction: plant safe.

Typically wild-caught; acclimate slowly.

Feeding

Eats at night. Sinking pellets, wafers, frozen bloodworm, frozen shrimp, and frozen krill are the staple foods. Drop food near the fish's hiding spot after lights-out. They'll also scavenge any food that reaches the bottom during daytime feeding, vacuuming it up after dark. Not picky, not shy about eating once they come out. In tanks with aggressive daytime feeders, the raphael compensates by being patient and thorough at night. Live earthworms and blackworms are relished.

Nocturnal feeder; drop food after lights out.

Compatibility

• Nocturnal, peaceful, and armored. During the day, raphael catfish wedge themselves into caves, driftwood, or behind equipment and don't move. At night, they emerge and cruise the bottom searching for food. You may own one for years and rarely see it.
• Safe with any fish too large to eat. Despite reaching 20–25 cm, they're not predatory in the way oscars or pike cichlids are. Mouth size limits prey to very small fish and invertebrates. Adult cherry shrimp are safe; shrimplets may not be.
• The pectoral fin spines lock and are serrated. Same handling precaution as pictus catfish: never net them, always use a rigid container. The spines can puncture bags and sting your hands.
• Extremely long-lived. Specimens in the 15-20 year range are common, and reports of 25+ years exist. A raphael catfish is a long-term commitment.

Origin and habitat

Platydoras armatulus, the striped Raphael or talking catfish, is an armoured doradid catfish from tropical South America, widespread through the Amazon, Parana-Paraguay, and Orinoco basins. Valenciennes described it in 1840 as Doras armatulus. For years the hobby sold it under the name Platydoras costatus, a separate, plainer species from the Guianas, until Piorski and colleagues sorted the confusion out in 2008; the easy tell is that armatulus has its white stripe running forward onto the head, where costatus does not. It belongs to the thorny catfish family, Doradidae, and is heavily armoured, its flanks lined with bony scutes carrying spines and its pectoral and dorsal fins tipped with strong, lockable, serrated spines, a formidable defence. The body is black with bold cream-white stripes. The fish is famous for making sound, the trait behind talking catfish: it stridulates by grinding the pectoral-spine base against the shoulder girdle and also drums by vibrating its swim bladder with a bony elastic spring, producing grunts and barks when handled or stressed, even out of water. Records list a large maximum near 43 cm, but in captivity 20 to 24 cm is the usual size. It is one of the longest-lived aquarium fish, routinely topping twenty years.

Breeding

It is rarely bred in home aquariums, and the natural triggers, probably tied to seasonal flooding and migration, are not reproducible in a tank. Sexing is unreliable beyond a gravid female looking a little rounder. Commercial breeding using hormone induction has been reported in Southeast Asian farms, and most fish now sold are farmed rather than wild-caught, while the occasional keeper finds fry in a tank with long-established adults, so spontaneous spawning seems possible but unpredictable.

Common problems

The main letdown is simply that you rarely see it: a striped Raphael spends the day jammed into a cave, wood, or behind equipment and only comes out after dark, so dim blue or red moonlighting is the way to watch it. The locking, serrated pectoral spines are a real handling hazard, tangling in nets, piercing bags, and able to sting a hand, so the fish should be moved in a rigid container. Ich can be hard to spot against the pale striping, and chemical treatments penetrate the bony armour slowly, so heat and a longer treatment work better. In a community it can go hungry if daytime feeders strip the food before it emerges, which after-dark feeding solves. Otherwise it is exceptionally hardy, and the real catch is the commitment: a juvenile bought today may still be alive in twenty years.

Bioload

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size