2025 River Herring & American Eel Survey Goes Swimmingly Thanks to Dedicated Volunteers

Every spring, Seatuck Environmental Association leads the River Herring & Eel Survey, a community science effort to monitor the seasonal migration of river herring and American eels across Long Island and parts of Queens. Active since 2006, it’s one of Long Island’s longest running community science projects. Volunteers visit streams during peak migration (March–May) to record sightings, helping scientists track the timing, size, and location of these critical fish runs.

Arnette snaps a selfie with her daughters during a survey. Photo credit: Ariel Arnette
Volunteer Ariel Arnette snaps a selfie with her daughters during a survey. Photo credit: Ariel Arnette

In Queens and the North Shore of Long Island, a region covering Long Island Sound, as well as the Sound Shore in Westchester, this work is done in collaboration with the Long Island Sound Partnership, where survey data informs habitat restoration efforts, identifies connectivity needs, and evaluates fish passage performance.

The survey is essential to understanding where river herring still return to spawn, often in fragmented or degraded habitats, if they are colonizing new streams, and the scale of their spawning migration. Volunteers are the heart of this project, providing the on-the-ground observations needed that help prioritize restoration sites and support initiatives like the River Revival Project, which aims to reconnect our rivers and restore fish abundance.

Confused river herring skipped the fish ladder and attempted to cross on its own. Beaver Creek, Mill Neck. Photo credit: Dylan Wong
Confused river herring skipped the fish ladder and attempted to cross on its own. Beaver Creek, Mill Neck. Photo credit: Dylan Wong
Snowy egret eating an eel. Roslyn Pond, Roslyn. Photo credit: Kyle Drum
Snowy egret eating an eel. Roslyn Pond, Roslyn. Photo credit: Kyla Drum

Thanks to targeted outreach and coordination by LIS Partnership staff (Jimena Perez-Viscasillas and Lillit Genovesi from NY Sea Grant and Sara Cernadas-Martín from NYSDEC/NEIWPCC), the North Shore stations, once overlooked rose to the top this year in both volunteer participation and number of observation events. This is a major milestone, especially considering that these sites continue to report few or no river herring sightings. The dedication of our volunteers, who return week after week even without fish in view, is what makes long-term recovery possible.

By the Numbers – 2025 River Herring & American Eel Survey

  • 38 active volunteers, including 21 on the North Shore—more than any other region.
  • Top 3 most surveyed sites were all on the North Shore and Queens and managed by LIS Partnership staff:
    1. Beaver Lake, Oyster Bay – 48 survey visits
    2. Sunken Meadow State Park – 44 visits
    3. Gabler’s Creek, Douglaston-Queens – 20 visits
  • 4,738 river herring and 385 American eels recorded across all regions.
  • North Shore sites reported 33 river herring and 136 eels, showing the dedication of volunteers who monitor even when counts are low.

To thank these incredible citizen scientists, the LIS Partnership hosted a Volunteer Appreciation Event on July 26 at the Waterfront Center in Oyster Bay. Volunteers enjoyed kayaking, pizza, fish ID practice, a recap of this season’s findings, and special prizes for our top contributors. We’re very grateful to everyone who gave their time and energy to support this survey. Your efforts are making a real difference!

Learn more or get involved at https://seatuck.org/volunteer-river-herring-survey/.

The article was written by Sara Cernadas-Martin, the New York State Habitat Restoration Coordinator for the Long Island Sound Partnership. Cernadas-Martin coordinates the volunteer survey for the LIS Partnership. She works for the New York State Department of Environmental Conservation through NEIWPCC.

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