River Herring Counting Workshop

The 2025 river herring counting workshop focused on updates and lessons learned on volunteer visual counting, electronic, and video counting methods.

DMF hosted a river herring counting workshop on March 12, 2025, at our New Bedford laboratory (the University of Massachusetts, Dartmouth Graduate School of Marine Science and Technology). The workshop followed a DMF workshop held 20 years ago in Gloucester that ushered the modern effort to count river herring in Massachusetts during their spring spawning migrations. The 2025 workshop focused on updates and lessons learned on volunteer visual counting, electronic, and video counting methods. Over 100 participants from local volunteer groups, watershed associations, municipalities, state, federal and non-government organizations attended the workshop both in-person and virtually. The workshop featured eight presentations (available for download below) as well as group discussions concerning current issues and directions for future monitoring efforts.

Session 1: Visual Counting and Estimation

Session 2: Video Monitoring and Machine Learning Applications

Session 3: Electronic Counting

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