Definition of upside-down catfish in English:
A small freshwater catfish that habitually swims upside down so as to browse on algae on the undersides of floating leaves. Native to central Congo, it is popular in aquaria.
- Synodontis nigriventris, family Mochokidae
- This fish is seen far less often in the aquarium trade, but also appears under the name of upside-down catfish.
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