Upside-Down Catfish: A Fish That Swims Wrong Way Up on Purpose

In this guide

Overview

The upside-down catfish genuinely spends much of its time swimming belly-up, a striking and unusual behaviour among aquarium fish that is not a sign of illness but a normal, deliberate adaptation. It comes from the Congo River basin in Africa and reaches around seven to nine centimetres.

The inverted swimming style is thought to help it feed on food and insects clinging to the underside of leaves, logs and overhangs, a niche few other fish exploit, and young fish often practise the behaviour more than fully grown adults.

Tank and water requirements

A group of five or six does well in a tank of eighty litres or more, with driftwood, caves and overhanging decor that gives it surfaces to explore both right side up and upside down. It tolerates a reasonable range of water conditions, including typical Indian tap water.

It is mostly nocturnal and appreciates some shaded, dimly lit areas during the day to rest in.

Diet and behaviour

An omnivorous diet of sinking pellets, algae wafers and occasional live or frozen food suits it well, offered in a way that lets the fish feed comfortably in its preferred inverted position if it chooses to.

It is peaceful and generally shy, doing best in a calm community tank without boisterous or aggressive tankmates that might intimidate it away from feeding.

Buying tips

• Priced around fifty to one hundred twenty rupees per fish in most Indian shops that stock African catfish species
• A genuinely interesting conversation fish given its unusual, deliberate upside-down swimming
• Provide overhangs and driftwood specifically to let this fish express its natural behaviour rather than just decorative cover

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