Wels Catfish (European Catfish)

The Wels Catfish (European Catfish), scientifically known as Silurus glanis, belongs to the Catfish family group. Adults reach a maximum size of approximately 150 cm and have a depressed body shape with a fast growth rate. Classified as aggressive, this species primarily occupies the bottom zone of the aquarium and produces a extreme level of biological waste.

To thrive, the Wels Catfish (European Catfish) requires a freshwater only aquarium with a minimum volume of 10000 litres and a tank length of at least 400 cm. Water temperature should be maintained between 4°C and 25°C, with a pH range of 6–8 and a general hardness of 5–20 dGH. A moderate water flow is preferred.

Due to its specialist needs, the Wels Catfish (European Catfish) is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 3 varieties: Adult / Standard, Juvenile (Grow-out), and Albino Wels Catfish. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.

When setting up an aquarium for the Wels Catfish (European Catfish), a moderate water flow best suits their natural preferences. Because this species occupies the bottom zone, the aquarium layout should prioritise sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include smooth gravel or rounded substrate to protect their sensitive barbels and driftwood, which can serve as both a hiding place and a dietary supplement.

Classified as aggressive, the Wels Catfish (European Catfish) is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten and territorial behaviour may cause issues if hiding spots or floor space are limited. Selecting tankmates that favour different water layers from the bottom zone can help reduce competition and territorial overlap.

Wels Catfish (European Catfish) is best for a fishkeeper who expects a species with attitude and plans the tank around that behavior and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially smooth gravel.

The most common mistake is buying Wels Catfish (European Catfish) for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.

The Wels Catfish (European Catfish) is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided and is primarily active at dusk and dawn, so offering food shortly after lights-off ensures it receives adequate nutrition.