Shoal & Stem
Back to Flora & Fauna

No photo yet

Sign in to submit the first photo

FishmediumFreshwater

Midnight Catfish

Auchenipterichthys thoracatus

📍 South America

The Midnight Catfish (Auchenipterichthys thoracatus) is a striking nocturnal driftwood catfish from South America, known for its dark, velvety coloration and active personality. It is a member of the family Auchenipteridae and is notable for its internal fertilization, a rare trait among catfish. This species is a rewarding choice for intermediate aquarists who appreciate active, personable catfish with unique behaviors.

Size4.5"
Min Tank30g
School3+
semi-aggressive
Zonemiddle

Community Photos

0 photos

Photos are added when members log a tank with this species and upload a photo in their tank journal. Add your own tank to contribute.

No photos yet — add a tank with Midnight Catfish to be the first!

Sign in to vote.

Care Guide

Diet

The Midnight Catfish is an omnivore that readily accepts a variety of foods including high-quality sinking pellets, freeze-dried or frozen bloodworms, brine shrimp, and daphnia. It is most active at night, so feeding in the evening is recommended to ensure it competes well for food. Supplement its diet with occasional live foods to encourage natural foraging behavior and optimal health.

Behavior

This species is primarily nocturnal, spending daylight hours hiding among driftwood, caves, or dense vegetation, and becoming very active after lights out. It can be kept in small groups of three or more of its own kind, though males may occasionally spar with one another. It generally ignores tankmates that are too large to eat, but may prey on very small fish or shrimp.

Breeding

Breeding in captivity is uncommon but has been achieved; females undergo internal fertilization and can store sperm for extended periods. To encourage spawning, condition the pair with live foods and simulate a rainy season with slightly cooler, softer water changes. Eggs are deposited in hidden locations and the female provides minimal parental care.

Common Diseases

Ich (White Spot Disease)

Symptoms

Small white spots resembling grains of salt on body and fins, flashing, lethargy

Treatment

Raise temperature gradually to 28-30 C, treat with ich medication such as malachite green or copper-based treatments; catfish are sensitive so use half doses

Bacterial Infection (Columnaris)

Symptoms

White or grayish patches on skin, frayed fins, ulcers, rapid gill movement

Treatment

Improve water quality, treat with antibacterial medications such as kanamycin or nitrofurazone

Fungal Infection

Symptoms

Cotton-like white or gray tufts on body or fins, lethargy, loss of appetite

Treatment

Remove affected fish to a hospital tank, treat with antifungal medications such as methylene blue or clotrimazole-based products

Parasitic Worms (Internal Parasites)

Symptoms

Bloating, wasting despite eating, stringy white feces, lethargy

Treatment

Treat with antiparasitic medications such as praziquantel or fenbendazole added to food or water

Tips from the community 💡

0 tips

Real experiences, care advice, and keeper notes. Finn learns from these too.

Sign in to share your experience.

No community tips yet — be the first to share your knowledge!

Ask Finn

Quick Facts

diet
Omnivore – accepts sinking pellets, frozen/live foods such as bloodworms, brine shrimp, and small invertebrates
lifespan
5-8 years
max size
11 cm (4.5 in)
tank size
30 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)

Stats

Community tips0
Kept by0 hobbyists