2 p.m., Parker River National Wildlife Refuge, Plum Island Turnpike, Newburyport
What lurks below the surface of the Merrimack River? It might surprise you — in a good way.
Join Eric Roach, a longtime local fisherman and lecturer, as he talks about the changing nature of fish and fishing in the river. From its low point 50 years ago as a heavily polluted river, the Merrimack has seen a rebound in many important species of fish, though it still faces many challenges.
The lecture is free to the public. It will be held Sunday, April 22 (Earth Day) at 2 p.m. at the Parker River National Wildlife Refuge Headquarters, located on Plum Island Turnpike in Newburyport.