White perch are small  7 to 12 inches in length. They are silvery greenish-gray fish with a dark, highly domed back . Sources: https://nas.er.usgs.gov/queries/factsheet.aspx?SpeciesID=777 & https://www.dnr.state.mn.us/invasives/aquaticanimals/whiteperch/index.html.

White Perch was brought from New Jersey to Nebraska in 1964, and fry produced that year in a hatchery were accidentally introduced into a reservoir that provided access to the Missouri River (Hergenrader and Bliss 1971). White Perch has been stocked intentionally in other areas for sportfishing. Factsheet.