绣滑油鲶 · Sailfin Pim

Overview

A tall sail-like dorsal fin and independently moving long barbels distinguish Leiarius pictus. This rapidly growing catfish can live well beyond twenty years. Adult accommodation must therefore exist before purchase rather than depend on a hoped-for upgrade or rehoming.

Distribution & habitat

It inhabits the Orinoco in Colombia and Venezuela and parts of the Amazon in Peru and Brazil. Large rivers and lakes offer submerged roots and other daytime retreats; feeding activity increases after dark.

Aquarium setup

Adult housing is on the order of 240 by 90 by 120 cm, with enough width to extend the barbels. Dim light allows sparse decor; any substantial wood or stones must be secured while retaining open swimming space. Juveniles benefit from roots, rock shelters, and suitably sized pipes.

Ordinary gravel may be swallowed or lodge in the gills. Sand is movable, while large smooth pebbles or a bare bottom are practical alternatives. Heavy waste production requires substantial biological filtration. A sump also keeps fragile heaters and thermometers outside the reach of a powerful adult.

Diet & feeding

A natural fish predator, it usually accepts varied nonliving prawns, shellfish, fish pieces, and earthworms. Rotate foods to prevent fixation on one item. Feed juveniles on alternate days, reducing frequency toward at most one adult meal weekly. Avoid overfeeding, mammalian or avian meats, and feeder fish that can introduce disease.

Behaviour & compatibility

It can be peaceful with similarly sized fish too large to eat, but readily consumes smaller companions. Such a community requires near-public-aquarium scale. Territoriality toward conspecifics and other large pimelodids usually favors keeping only one of this type.

Sexual dimorphism

External sexing is unreliable; greater female bulk is only a tentative clue.

Notes

The especially tall dorsal fin helps separate it from similar catfish, notably when young. Restricting tank size is not a healthy way to keep it small.