The largescale stoneroller (Campostoma oligolepis) is a fish in the family Cyprinidae native to the eastern United States.

[3] It is native to the Upper Mississippi River and Lake Michigan drainages of Wisconsin, eastern Minnesota, eastern Iowa, and northern Illinois; Ozarkian streams of central and southern Missouri, and northern Arkansas; Mobile Bay drainage, Georgia, Alabama, and eastern Mississippi; parts of Green, Cumberland, and Tennessee River drainages of Kentucky, Tennessee, Georgia, and Alabama [4] It has also been introduced into other areas in North America like the Illinois River in Oklahoma.

It is thought that the reason for their introduction into the Oklahoma is due to the fact that it is a popular baitfish, and has effects on this area in ways that have not been noticed by scientist and researchers.

[6] It is a herbivorous fish which eats diatoms, green algae, and blue-green bacteria, with a tendency to ingest less sand and silt than the central stoneroller.

The breeding process starts with the males constructing the nest in gravel bars and rocks in the late winter.