Mill Brook Preserve supports the largest fish migration from Casco Bay. About 70,000 fish traveled this route in 2018! Each spring, the University of Southern Maine runs a volunteer fish count to monitor and learn about this migration. To learn more or sign up to help with the count in 2019, please see this form.

For fly-fishing enthusiasts, this map highlights some great spots in the Presumpscot River watershed–including a few Presumpscot Regional Land Trust Preserves–that are all publicly accessible and stocked by the Maine Department of Inland Fisheries and Wildlife in the spring.