Porthole catfish - Dianema longibarbis

Scientific name: Dianema longibarbis

Common name: Porthole catfish

Family: Callichthyidae

Usual size in fish tanks: 8 - 10 cm (3.15 - 3.94 inch)

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Recommended pH range: 5.8 - 7.8

Recommended water hardness: 2 - 20°N (35.71 - 357.14ppm)

0°C 32°F30°C 86°F

Recommended temperature range: 24 - 28 °C (75.2 - 82.4°F)

The way how these fish reproduce: Spawning

Where the species comes from: South America

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Bottom levels

Food and Feeding

Dianema longibarbis is an omnivorous bottom-dwelling species that will accept a wide variety of foods. Sinking pellets, algae wafers, and high-quality granules should form the staple diet. Supplement with live or frozen foods such as bloodworms, daphnia, and brine shrimp.

Although often considered a scavenger, this species should not rely solely on leftover food. Target feeding ensures all individuals receive adequate nutrition. Feed once daily, preferably in the evening when they are more active.

Origin

Dianema longibarbis originates from the Amazon basin in South America, including Brazil and Peru. It inhabits slow-moving rivers, floodplains, and heavily vegetated areas with soft, slightly acidic water.

Tank Setup and General Care

A soft sand substrate is recommended to protect their sensitive barbels. Provide hiding places using driftwood, plants, and caves. Floating plants are beneficial, especially for breeding.

This species is capable of breathing atmospheric air and will occasionally swim to the surface. This is normal behavior and should not be mistaken for distress.

They prefer calm water with gentle filtration. Dim lighting and planted aquariums help reduce stress.

Temperament and Compatibility

Dianema longibarbis is a peaceful and social species that should be kept in groups of at least four individuals. In groups, they display more natural and confident behavior.

They are suitable for community aquariums with peaceful fish such as tetras, rasboras, dwarf cichlids, and other non-aggressive species.

Sexing

Sexing Dianema longibarbis is difficult. Females are usually slightly larger and fuller-bodied than males, particularly when carrying eggs.

Breeding

Dianema longibarbis is a bubble nest builder. The male constructs a nest at the water surface, often among floating plants. After spawning, the female should be removed, as the male becomes protective of the nest.

The male guards the eggs until they hatch. The fry can be fed infusoria initially, followed by newly hatched brine shrimp. Soft, slightly acidic water improves breeding success.

Lifespan

With proper care, Dianema longibarbis can live up to 8–10 years. Stable water conditions and group keeping contribute to longevity.

Short Description

Dianema longibarbis is a peaceful bottom-dwelling catfish from the Amazon basin. This species thrives in groups and requires a soft substrate and calm environment. Its unique air-breathing ability and bubble nest breeding behavior make it an interesting addition to community aquariums.

Pictures

Bought by aqua-fish.net from jjphoto.dk. Other pictures were provided by Patrik.