Catfish (Siluriformes) represent one of the most diverse and fascinating groups of fish in the aquarium hobby. Found in nearly every freshwater environment worldwide, they range in size from tiny dwarf Corydoras to giant species requiring specialized setups.
Popular Groups of Catfish
In the hobby, catfish are often categorized into several main groups based on their appearance and requirements:
- Corydoras (Callichthyidae): Small, peaceful schooling fish ideal for community tanks, known for their constant foraging on the substrate.
- Suckermouth Catfish and L-numbers (Loricariidae): This group includes popular algae eaters like Ancistrus, as well as highly sought-after and colorful L-number species that often hide in caves.
- Synodontis: African catfish often kept with Rift Lake cichlids. Some species are famous for their habit of swimming upside down.
- Predatory Catfish: Larger species such as Pimelodus, which require more space and cannot be kept with small tank mates.
Tank Setup and Decor
Most catfish are nocturnal and appreciate plenty of hiding spots provided by caves, driftwood, and dense vegetation. Since many species sift through the substrate, using fine, rounded sand is essential to prevent damage to their sensitive barbels. Water parameters depend on the specific species, but generally, they require efficient filtration and well-oxygenated water.
Feeding
Catfish are often mistakenly viewed merely as "scavengers" living only on leftovers. While many do eat remaining food, they require a varied diet consisting of sinking pellets, frozen foods, and for some species, fresh vegetables or wood (essential for the digestion of certain suckermouth catfish).
