Couesius plumbeus picture (SheridanCouesius.jpg) by Erling Holm
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| Size (cm): | 20 TL |
| Locality: | Canada, Ontario, Mississauga, Sheridan Creek, 1 km u/s from mouth at Lake Ontario |
| Sex: | mixed |
| Date: | 2003-05-18 |
| Remark: | Schools of lake chub ascended creek to spawn. |