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

Native to the Amazon, Paraguay-Paraná, and lower Orinoco basins in South America. A member of the family Doradidae (thorny/armored catfishes). Described as Doras armatulus by Valenciennes in 1840. Until 2008, the species sold in the trade was misidentified as Platydoras costatus; the true P. costatus is a different, monochromatic species found only in coastal rivers of Suriname and French Guiana. Inhabits slow-moving rivers, streams, and flooded forests over muddy or sandy substrates with dense vegetation (Quinn's Fins, multiple sources). The body is heavily armored with lateral bony scutes equipped with spines; coloration is a distinctive black background with conspicuous pale (white or cream) horizontal stripes. Produces audible sounds through two mechanisms: high-frequency stridulation by rubbing pectoral fin spine ridges against the shoulder girdle, and low-frequency drumming by vibrating the swim bladder via a bony elastic spring mechanism. These sounds are emitted during disturbance, courtship, and territorial encounters. Typically reaches 15–20 cm in captivity (Quinn's Fins). One of the longest-lived species in the hobby; with good care, they can surpass 25 or even 30 years. Contrary to older information, most specimens now sold are captive-bred from Southeast Asian farms rather than wild-caught. IUCN Least Concern.

Breeding

Rarely bred in home aquariums. The spawning triggers are unknown in captivity and may involve seasonal flooding and migration cues. Sexing is unreliable; females may be slightly rounder when gravid. Commercial breeding has been reported using hormone injection in Southeast Asian facilities, but details are scarce. Wild-caught specimens are plentiful and cheap, which removes the economic incentive for breeding. Some hobbyists report finding fry in tanks with long-established adults, suggesting that spontaneous spawning is possible but not predictable.

Common problems

The main "problem" is that you never see them. Striped raphael catfish are committed to their daytime hiding spots and don't emerge until the lights are off. Keepers who expect a visible fish are disappointed. Adding moonlight LEDs (dim blue or red) lets you watch their nocturnal activity. The locking pectoral spines are a handling hazard covered above. Ich can appear in new purchases; the armored body makes visual diagnosis harder because the white spots are less visible against the pale striping. Treat with elevated temperature. Chemical treatments penetrate the bony armor more slowly, so extend treatment duration. Starvation is a risk in community tanks where daytime feeders eat everything before the raphael comes out. Targeted nighttime feeding prevents this. The fish is otherwise extremely hardy and disease-resistant. The biggest practical concern is longevity: people buy them as juveniles and don't plan for a 20-year commitment.

Bioload

Further reading

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