WHITEFIELD — Each spring, millions of alewives migrate up Maine’s rivers and streams to spawn, and in the summer, their millions of offspring migrate back to the sea.

Drs. Karen Wilson and Theo Willis will speak about these important fish, their population and migration and their interactions with other species in the Gulf of Maine during a free lecture starting at 4 p.m. on July 24 at Sheepscot General Store in Whitefield. 

Wilson is an associate research faculty member at the University of Southern Maine’s Department of Environmental Science and Policy. She is currently working on a project to study juvenile river herring and their habitat in the Penobscot and has studied how alewives create economic and ecologic connections between Maine’s lakes and rivers and the Gulf of Maine.  

Willis is an adjunct faculty member and researcher with the University of Southern Maine’s Department of Environmental Science. His investigations and projects have included freshwater food webs, food webs in the nearshore Gulf of Maine, historic abundance and distribution of alewives and the stock structure of alewives in the Gulf of Maine. He is also a board member for the Alewife Harvesters of Maine.

The Kennebec Estuary Land Trust and the Midcoast Conservancy are collaborating to host a series of speakers this summer focused on fish that migrate through Maine’s estuaries and rivers. 

The July 24 alewife presentation is the second of the series. 

The final presentation will be on Wednesday, Aug. 29 in Bath. John Burrows from the Atlantic Salmon Federation and Paul Christman from the Maine Department of Marine Resources will be presenting about the state of Atlantic salmon in Maine and restoration projects in the Kennebec, Androscoggin and Sheepscot Rivers. 

The Sheepscot General Store is located at 98 Townhouse Rd. in Whitefield.