1st Record: Conowingo Dam [in Conowingo Village]/MD/Susquehanna River (2008, USGS Nonindigenous Aquatic Species Program 2008), 1 specimen in power plant intake). The scattered collections of small numbers of settled mussels and veligers inidcate a small, but established population (Klauda and Ashton 2013; Klauda and Ashton 2015).
Peach Bottom Atomic Power Station/PA/Susquehanna River (nontidal, ~15 km upstream of Conowingo, 2009-2013, 47 to 5,000 veligers collected per year, but only 2-4 settled mussels, Klauda and Ashton 2013); Conowingo Dam [in Conowingo Village]/MD/Susquehanna River (11/20/2008, USGS Nonindigenous Aquatic Species Program 2008, 1 specimen in power plant intake); (nontidal, Glen Cove Marina/MD/Conowingo Pond (single mussel on boat); City of Baltimore water intake, upstream of Conowingo Dam/MD/Susquehanna River (6/11/13, Klauda and Ashton 2013), zebra mussels attaced to intake); Harford County water intake, upstream of Conowingo Dam (5/20/12, veligers found in water samples, Klauda and Ashton 2013); Spencer and Roberts Islands, below Conowingo Dam/MD/Susquehanna River (7/6/2010, Maryland Department of Natural Resources 2010, http://dnr.maryland.gov/dnrnews/pressrelease2010/071510c.asp, 9 live, 2 dead mussels. More were found here in 2012, Klauda and Ashton 2013); near Betterton/MD/Sassafras River, near mouth of Turner Creek (10/17/2011, USGS Nonondigenous Aquatic Species Program 2011, 1 mussel, dead, but it was still attached to a jet ski mooring).; buoys off Havre de Grace/MD/Susquehanna River-Chesapeake Bay (12/3/12, http://news.maryland.gov/dnr/2012/12/17/more-zebra-mussels-found-in-upper-chesapeake-bay/; Klauda and Ashton 2013, about 20 live mussels found; Klauda and Ashton 2015); Havre de Grace/MD/Susquehanna Flats (Ashton and Klauda 2014, Ashton and Kaluda 2015, 100s to 1000s on floats and lines); MD/Bush, Gunpowder, Middle River estuaries (7-8/205, Wheeler 2015, settling on crab gear and submerged vegetation)
|Alternate||Fisheries Accidental (not Oyster)|
ReferencesAshton, Matthew J.; Klauda, Ronald J. (11/21/14) <missing title>, Maryland Department of Natural Resources, Annapolis MD. Pp. 1-6
Ashton, Matthew J.; Klauda, Ronald J. (2015) The spread of zebra mussels (Dreissena polymorpha) from the lower Susquehanna River into the upper Chesapeake Bay, USA, BioInvasions Records 4: In press
Halsey, Ashley III (5/24/2009) Find of invasive zebra mussels could spell serious damage, Washington Post <missing volume>: published online
12/17/12 More Zebra Mussels found in Upper Chesapeake Bay. http://news.maryland.gov/dnr/2012/12/17/more-zebra-mussels-found-in-upper-chesapeake-bay/
12/4/2013 Current status of Zebra Mussels in Maryland. Resource Assessment Service, Maryland Department of Natural Resources, Annapolis MD. 5pp.
Thomson, Candus (11/25/2008) Waterways face threat: Single invasive mussel found., Baltimore Sun <missing volume>: <missing location>
2003-2015 Nonindigenous Aquatic Species Database. Gainesville, FL. http://nas.er.usgs.gov
Vanassche, Jennifer M.; Wong, Wai Hing; Harman, Willard N.; .Albright, Matthew F (2014) Early invasion records of zebra mussels Dreissena polymorpha (Pallas, 1771) in Otsego Lake, New York, BioInvasions Records 3: In press
Wheeler, Timothy (8/26/2015) Zebra mussels found in Gunpowder, Middle rivers, Baltimore Sun <missing volume>: published online
Wheeler, Timothy B. (12/15/2014) Pipe-clogging zebra mussels a growing concern in Maryland, Baltimore Sun <missing volume>: 1