Invasion

Invasion Description

1st Record: PA/Delaware River (Bean

1st Watershed Record: NJ-PA-DE/fish ponds (1882, McDonald 1884). 1882, widespread shipments to applicants in Congressional districts, for pond-rearing; probably many fish jwere ust released (MacDonald 1884). By 1893, they were established in PA (Bean 1893). By 1911, they were abundant in DE (Fowler 1911).

Geographic Extent

Trenton-Philadelphia-Wilmington/NJ-PA-DE (Fowler 1911; Horwitz 1986; Raasch and Altemus 1991; Weisberg et al. 1996); DE/Chesapeake and Delaware Canal (Wang and Kenehahan 1979); DE/Appoqunimink Creek (Smith 1971); DE/Alloway Creek