Becker, George C. / Fishes of Wisconsin
Trout-perch family - percopsidae, pp. 739-744 PDF (2.4 MB)
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
http://rightsstatements.org/vocab/InC/1.0/| Copyright 1983. The entirety of this book is available for viewing by the public as an Open Access text through the cooperative efforts of George Becker, the University of Wisconsin Press, and the UWDCC. This Work is copyrighted to the Board of Regents of the University of Wisconsin System. Any use of this material falling outside the purview of "Fair Use" requires the permission of the University of Wisconsin Press.