Pembroke: Pennamaquan River Walk

Saturday, May 27

2 - 4 pm 

Guide: Fred Gralenski

This hike will focus on the alewife (Alosa pseudoharengus), an anadromous fish that migrates up rivers about this time of year to spawn in lakes. State and federal fisheries managers are studying rivers and streams as nurseries for the Gulf of Maine. Recently the St. Croix River was opened to spawning anadromous fish after an 18 year closure.

We hope to see Bald Eagle, Osprey, and other birds feeding on migrating alewives, and although river herring don’t make spectacular leaps like salmon, they negotiate some very fast water, and their capabilities are impressive.

We will discuss the life cycle of diadromous fish, and how they can survive in both salt and fresh water; their impact (both real and imagined) on fresh water lakes, and their importance as forage for birds, mammals, and other fish. We will net a few alewives and show their interesting anatomy as plankton feeders. We will also discuss their use as nutrition for soils, lobsters and people.

Where to start: Route 1 in Pembroke. Meet at the parking lot beside the former Crossroads Restaurant & Motel (now closed) by the falls.