Invasion

Invasion Description

1st Record: Hebron (Worcester County)/MD/Wicomico River drainage (1981, Associated Press 1986; Kilian et al. 2009)

1st Watershed Record: Patuxent National Wildlife Research Center/MD/Patuxent River drainage (1963, Norden 1995, personal communication; Killian et al. 2009, introduced as wildlife food), 1st Record: Philadelphia/PA/Long Hook Creek (2007, Lieb et al. 2011), 1st Records: Worcester County/MD/Tributary to Pawpaw Creek, Chincoteague Bay (38º09'44" 75º17'55" 26 June 2006, Killian et al. 2009); Worcester County/MD/Scarboro Creek (38º09'32" 75º18'10" 26 June 2006, Killian et al. 2009)

Geographic Extent

Hebron (Worcester County)/MD/Wicomico River drainage (Associated Press 1986); Lorton (Fairfax County)/VA/unnamed stream (Potomac Drainage) (1992, USNM 192902, US National Museum of Natural History collections); King William County/VA/Cohoke Mill Creek, Pamunkey Drainage (1972, USNM 192902, US National Museum of Natural History 2007); MD/Patuxent River (established and common in Patuxent National Wildlife Research Center, and is probably widespread through the freshwater Patuxent drainage; Norden 1995; Kilian et al. 2009); MD/Mattawoman Creek (1989-2007, Killian et al. 2010); Charles County/MD/Mallows Bay-Wades Bay, Potomac River (2006, Killian et al. 2009; Killian et al. 2010); Charles County/MD/Nanjemoy Creek (2006, Killian et al. 2010); Kent County/MD/Fairlee Creek (2006, Killian et al. 2009; Killian et al. 2010); Queen Annes County/MD/Corsica River (1989-2007, Killian et al. 2009; Killian et al. 2010); Dorchester County/MD/Fishing Bay tributaries (1989-2007, Killian et al. 2009; Killian et al. 2010); MD/Rewastico Creek Nanticoke River (1989, Killian et al. 2009); Somerset County/MD/Manokin Branch (2006, Killian et al. 2009); MD/Pocomoke River (2006, Killian et al. 2009; Killian et al. 2010), Philadelphia/PA/Long Hook Creek (2007, Lieb et al. 2011), Worcester County/MD/Tributary to Pawpaw Creek, Chincoteague Bay (38º09'44" 75º17'55" 26 June 2006, Killian et al. 2009); Worcester County/MD/Scarboro Creek (38º09'32" 75º18'10" 26 June 2006, Killian et al. 2009)