Comments: Formerly placed in the genus Roccus. Distinct populations occur within Chesapeake Bay and in other areas (Chapman 1990). Wirgin et al. (1989) found unique mtDNA genotypes in the Apalachicola River system, suggesting the continued existence there of a maternal lineage of Gulf ancestry. The family Percichthyidae was recognized by Robins et al. (1991) as possibly polyphyletic but was retained for convenience.