CURRENTLY MONITORING: 

Over-wintering wavy-rayed lampmussels and infected smallmouth bass)
 

COSEWIC listing: Endangered

To view footage of the wavy-rayed lampmussel from our BRAVO video archive, click HERE

In a few rivers in Canada including the Grand River, Ontario, this endangered unionid bivalve uses lures to attract smallmouth bass as part of its reproductive cycle.  When a fish approaches the lure (one lure type imitates a leach, one imitates a crayfish and the other lure type imitates a darter - see pictures below), the mussel expels numerous glochidia into the mouth of a smallmouth bass.  The glochidia are larval mussels that attach to the gill filaments  of the fish for several months.  During this period, the fish carry the mussels upstream, and likely use fishways to transport mussels upstream over barriers such as the Mannheim weir, which is located approximately 5 km upstream from BRAVO node 1. 

Wavy-Rayed Lampmussel archive

Photographs of female Lampsilis fasciola from the Thames River and Grand River, Ontario, courtesy of Todd Morris - Fisheries and Oceans Canada