Aplodinotus grunniens (Freshwater Drum) is one of the few freshwater members of the drum or croaker family (Sciaenidae), distinguished by modifications of the swimbladder which enable them to produce loud sounds associated with mating and territorial behavior. This fish is native to the Mississippi-Gulf-Great Lakes basin, from Mexico to Montana and Quebec. In 1989. a single specimen was collected in the Hudson River, but it is now established in the tidal freshwater portion of the river. It probably colonized the river through the New York State Barge Canal. In 2020, this fish was caught in the Schuylkill River, in Philadelphia. Websites indicate multiple catches in Delaware and New Jersey and probable establishment. In 2023, several specimens were caught near Conowingo Dam, at the head of Chesapeake Bay, on the Susquehanna River, but establishment here is unknown. This fish could have been introduced to the Delaware and Susquehanna Rivers by unofficial releases, or as contaminants in batches of stocked fishes, or discarded bait. This fish has been tracked in the Hudson River by its sound production. The Freshwater Drum is moderately popular as a sport-fish, considered a 'rough fish' by some, and good eating by others. It has a preference for freshwater mussels, which is a conservation concern.