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Becker, George C. / Fishes of Wisconsin
(1983)

Trout-perch family - percopsidae,   pp. 739-744 PDF (2.4 MB)


Page 739

 
Trout-Perch Family- 
           Percopsidae 
  A single genus and only two species are recognized in this family, which
is placed in the same suborder with the Aphredoderidae (pirate perch) 
and Amblyopsidae (cavefishes). Regarded as of North American origin, 
the trout-perch is thought to have repopulated North America in post- 
glacial times from a refugium in the Mississippi Valley. 
  The trout-perch is a surviving remnant of a fauna which marked the 
transition from soft-rayed, herringlike forms to the later appearing groups
of spiny-rayed fishes. It resembles both a trout and a perch: its adipose
fin and naked head are features of the Salmonidae, its ctenoid scales and
fin spines, and the form of its mouth, make it appear to be related to the
Percidae. 
  The trout-perches possess large heads, and nonprotractile premaxillar-
ies which form the border of the upper jaw. Their dorsal, pelvic and anal
fins are each preceded by one to two weak spines. The scales are small, 
and have only a single row of weak ctenii on their exposed edges. 
739 


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