They’re back!

The 2026 herring migration has begun. Let’s get counting!

Note: if you're not seeing any fish in the videos, don't panic! Videos from the beginning or end of the migration may have no herring in them. Counting these videos is still super helpful (even if they're all zeros) as it helps us pin-point when the migration begins and ends.

Love Nature? Count Fish.

Help us track river herring populations in the Mystic River watershed, and be part of an environmental success story. Watch a video and record what you see. Scroll down for the latest data. Have questions about the online counting, check out the FAQs here.

Read instructions for more detail.

This project is led by the Mystic River Watershed Association to provide needed data to both estimate the herring run size and to also learn more about this keystone species to aid in recovery and restoration efforts.

Website Development by: Walker Environmental, LLC