Percopsiformes
English: Northern cavefish.
Synonyms: Percopsida; Salmopercae; Salmopercoidea; Heteropygii.
Habitat: freshwater .
Region: North America.
Zoology
Ray-finned fishes; characteristics of their internal anatomy; different species may appear quite different externally.
Genera: 7; 11 species; 3 families.
Size: 5 to 20 cm.
Families
• Amblyopsidae; Cavefishes.
• Aphredoderidae: Pirate perch.
• Percopsidae: Trout-perches.