No photo yet
Sign in to submit the first photo
Porthole Catfish
Dianema longibarbis
Also known as Flagtail Porthole Catfish
Animalia›Chordata›Actinopterygii›Siluriformes›Callichthyidae
📍 Rio Negro & Rio Madeira, Brazil
The Porthole Catfish is a slender, elongated catfish reaching around 10 cm (3.9 in), featuring a beige to tan body adorned with rows of small dark spots along the flanks and a distinctive pattern of long barbels around the mouth. It is a peaceful, social species that spends most of its time near the substrate and lower water column, making it an excellent cleanup crew member in community aquariums.
Community Photos
0 photosPhotos 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 Porthole Catfish to be the first!
Sign in to vote.
Care Guide
Diet
Porthole Catfish are omnivores that accept a wide variety of foods including high-quality sinking pellets, wafers, and bottom-feeder tablets as a dietary staple. They benefit greatly from regular supplementation with frozen or live foods such as bloodworms, tubifex, and daphnia to encourage optimal health and coloration. Occasional offerings of blanched vegetables like zucchini or cucumber are also accepted and provide useful dietary variety.
Behavior
Porthole Catfish are highly social and should be kept in groups of at least four to six individuals, as solitary specimens tend to become shy and stressed. They are most active during dawn and dusk, spending much of the day sheltering among driftwood, leaf litter, or dense vegetation near the substrate. They are completely non-aggressive and will not bother tankmates of any size, making them ideal for peaceful community setups.
Breeding
Breeding Porthole Catfish in captivity is possible but relatively uncommon compared to other callichthyids. Unlike many related species, they are bubble nest builders; the male constructs a floating nest of bubbles and plant material at the water surface, into which the female deposits eggs. The male guards the nest, and eggs typically hatch within 3-4 days; fry should be fed infusoria and finely powdered foods initially, and water quality must be kept pristine during this period.
Tank Mates
Similar soft, acidic water requirements and completely peaceful; an ideal pairing in a biotope-style Amazon setup.
Occupies the upper water column, reducing competition; ensure the tank is not overly aggressive or territorial with the gourami.
Peaceful mid-water schooling fish with overlapping water parameter preferences; adds activity to upper zones without disturbing the catfish.
Common Diseases
Ich (White Spot Disease)
Fine white spots resembling grains of salt covering the body and fins, flashing against surfaces, lethargy, and loss of appetite.
Raise water temperature gradually to 28-30 C to accelerate the parasite lifecycle, and treat with a copper-based or formalin-based ich medication; avoid medications containing scaleless-fish warnings as callichthyids can be sensitive.
Red Blotch Disease (Bacterial Hemorrhagic Septicemia)
Red streaks or blotches on the body and fins, ulcers, lethargy, and loss of appetite; often triggered by poor water quality.
Perform immediate large water changes to improve water quality, identify and eliminate the stressor, and treat with a broad-spectrum antibiotic such as kanamycin or nitrofurazone.
Fungal Infection
White or gray cotton-like growths on the body, fins, or around the mouth, often secondary to physical injury or poor water conditions.
Improve water quality with frequent water changes, remove any decaying organic matter, and treat with an antifungal medication such as methylene blue or a commercial antifungal product safe for scaleless fish.
Tips from the community 💡
0 tipsReal 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!
Quick Facts
- diet
- Omnivore; sinking pellets, frozen and live foods
- lifespan
- 5-8 years
- max size
- 10 cm (4 in)
- tank size
- 30 gallons minimum
Water it likes
- ph
- 6.0-7.5
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 2-12 dGH
- temperature
- 72–82°F (22–28°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.