Zebra mussels under a bridge on Trent-Severn Waterway
ZEBRA mussels - fresh water mollusks - are invading the five Great Lakes and waterways in between. It's thought that more than two decades ago, zebra mussels hitch-hiked their way to the Lake St. Clair in the ballast of ships.
Because zebra mussels have no natural enemies in the Great Lakes area, they spread and have become a problem. Apparently the mussels filter algae from the water, removing food that larval fish and other invertebrates - now in decline - would have eaten.
Closer view of Zebra mussels
On the other hand, many native birds, fish and other animals eat zebra mussels. Some duck populations have changed their migratory routes to take advantage of these tasty morsels. And fish such as small-mouthed bass, perch, sunfish and lake sturgeon have increased in some areas heavily invaded by zebra mussels.
FYI: I took these photos when the water was low so they had been out of the water for a while.
I am linking to Jenny Matlock at Alphabe-Thursday HERE