| Specimen ID | 157344 |
| Group | Crustaceans-Cladocerans |
| Genus | Cercopagis |
| Species | pengoi |
| Common Name | fishhook waterflea |
| Country | Canada |
| State | ON |
| Locality | Between Oakville and Grimsby, Ontario in western Lake Ontario |
| Mapping Accuracy | Approximate |
| HUC8 Name | Lake Ontario |
| HUC8 Number | 04280002 |
| Map | |
| Collection Day | 30 |
| Collection Month | 6 |
| Collection Year | 1999 |
| Year Accuracy | Actual |
| Potential Pathway | shipping ballast water |
| Status | established |
| Reference 1 |
| Ref. Number: | 13643 |
| Author: | MacIsaac, Hugh M. |
| Date: | 2000 |
| Title: | Cercopagis pengoi: Another Ponto-Caspian invader in the Great Lakes. |
| Publisher: | University of Windsor (http://wwwcsuwindsorca/users/h/hughm/private/cercopagishtml). |
| Pages: | 1-5 |
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| Comments | Density in early July was very low (<10% of summer 1998 densities). However, population consisted of parthenogenetic females (many fecund/up to 12 eggs/individual). Dr. Joe Makarewicz (SUNY Brockport) reported C. pengoi densiites of 600 ind/m3 in L. Ontario in Aug. 99. Late summer densities exceeded 1500 ind. m3 in the lake. |
| Record Type | Literature |
| Freshwater/Marine | Freshwater |
| Specimen Impact | Planktivory by alewife is expected to be intense during 1999. |
