is a family of fish in the order Percopsiformes
. Its living members are two North American fresh water species of the genus Percopsis
, trout-perch Percopsis omiscomaycus (Walbaum 1792)
and sand roller Percopsis transmontana (Eigenmann & Eigenmann 1892)
Trout perch are silvery-transparent in appearance. Specimens found in the US range from 76-102 mm while ones found in Canada can get as big as 152 mm. These fish live 3-4 years in shallow lakes and streams, hiding among rocks. They survive on chironomids, ephemeropterans, amphipods, and small fish.
Similar in appearance to trout-perch, although shorter and stubbier, sand rollers grow up to 9.6 cm and live up to 6 years in slow-moving, sandy-bottomed streams and rivers among vegetation. Their diet includes Diptera
, although juveniles also have been known to eat crustacean zooplankton