Alewives stack up Sunday in Seven Mile Stream in Vassalboro, while migrating from the Atlantic Ocean to Webber Pond.

Thousands of the river herring are moving up the Kennebec River to various fresh water lakes to spawn, according to Maine Department of Marine Resources biologist Nate Gray. DMR is assisting the fish by carrying them by truck above the Lockwood Dam in Waterville, as well as lifting them over Benton Falls on the Sebasticook River.

About 20,000 alewives have entered Webber Pond in the fourth day of the migration, Gray said, with an estimated 500,000 moving through the Benton Falls fish lift.  

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