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The Percopsiformes are a small order of ray-finned fishes, comprising the trout-perch and its allies. It contains just ten extant species, grouped into seven genera and three families. Five of these genera are monotypic[2]

Temporal range: Eocene–Recent
Amblyopsis spelaea.jpg
Northern cavefish
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Superorder: Paracanthopterygii
Order: Percopsiformes
L. S. Berg, 1940

Amblyopsidae (cavefishes)
Aphredoderidae (pirate perch)
Percopsidae (trout-perches)

  • Percopsida
  • Salmopercae
  • Salmopercoidea
  • Heteropygii Tellkampf 1844

They are generally small fish, ranging from 5 to 20 cm (2.0 to 7.9 in) in adult body length. They inhabit freshwater habitats in North America. They are grouped together because of technical characteristics of their internal anatomy, and the different species may appear quite different externally.[1]


  1. ^ a b Cohen, Daniel M. (1998). Paxton, J.R.; Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 129. ISBN 0-12-547665-5.
  2. ^ Froese, Rainer, and Daniel Pauly, eds. (2008). "Amblyopsiformes" in FishBase. December 2008 version.
  3. ^ Haaramo, Mikko (2007). "Percopsiformes". Mikko's Phylogeny Archive. Retrieved 30 December 2016.
  4. ^ Nelson, Joseph S.; Grande, Terry C.; Wilson, Mark V. H. (2016). Fishes of the World (5th ed.). John Wiley & Sons. ISBN 9781118342336.
  5. ^ van der Laan, Richard (2016). "Family-group names of fossil fishes". Cite journal requires |journal= (help)