Bythotrephes longimanus

Spiny waterflea

Collection Information for Bythotrephes longimanus

Results limited to HUC #4180000.
To see the collection list for the entire Great Lakes region, click here.
 To see the collection list for the entire United States, click here.
 Results also available in (click to export table to spreadsheet)

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Specimen IDStateCountyLocalityYearHUC NumberDrainage NameStatus
4264WI Lake Superior198904180000Lake Superiorestablished
168297WIAshlandLake Superior, North Channel on east side of Basswood Island200604180000Lake Superiorestablished
270099WIBayfieldLake Superior198704180000Lake Superiorestablished
270101WIDouglasLake Superior198704180000Lake Superiorestablished
270102WIIronLake Superior198704180000Lake Superiorestablished
1709501WIDouglasSt. Louis River201804180000Lake Superior 
1709503WIDouglasSt. Louis River201804180000Lake Superior 
1709506WIDouglasSt. Louis River201804180000Lake Superior 
1709507WIBayfieldChequamegon Bay201804180000Lake Superior 
1709508WIBayfieldChequamegon Bay201804180000Lake Superior 

Citation for this information:
U.S. Geological Survey, 2026, Bythotrephes longimanus: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 2/22/2026