Suckermouth catfish may refer to:

• Any species of armored catfish (family Loricariidae), most notably:
  • Hypostomus plecostomus and Hypostomus punctatus, two species of armored catfish popular with aquarists.
  • Any similar species marketed under the name "plecostomus" or "pleco".
  • The sailfin suckermouth, usually Pterygoplichthys gibbiceps.
  • The pygmy suckermouths, species in the genus Otocinclus.

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