Citizen Science: American Eel Research
Students and Community Partners Research Migratory Fish
These nearly transparent glass eels
were born in the Atlantic's
The American eel (Anguilla rostrata), a migratory fish, is born in the Atlantic Ocean and enters North American estuaries, including the Hudson River, as tiny, see-through "glass eels" each spring. Once they arrive, they soon gain pigment and become part of the ecosystem for years to come. The species is in decline over much of its range, and baseline studies, like the Hudson River Eel Project, of populations are crucial for management decisions.
The eel project is coordinated by the NYSDEC Hudson River Estuary Program and the Hudson River National Estuarine Research Reserve, in partnershp with the Water Resource Institute at Cornell University. During this project, teams of scientists, students, and community members collect glass eels using specialized nets and traps on Hudson River tributaries each spring. The juvenile fish are counted, weighed, and released, and other environmental data is recorded. At the end of each season the data is compiled and sent along to decision-makers.
The project directly involves students and volunteers with scientific design and field methodology. Participants experience their local ecosystem firsthand, and collect important information and relevant data about migrating fish.
- Check out results from 2015 in the Hudson River American Eel Research Project Overview (PDF, 5.35 mB)
- Download the Hudson River Eel Project Report (PDF) (2 mB), which covers results from 2008-2016.
- Check out our Eel Project Presentation (PDF) (2.35 mB), with pictures, data, and more!
Volunteer With Us
There are many opportunities to get involved with American Eel Citizen Science. Below are descriptions of our eel projects. Check out other volunteer opportunities with the Hudson River Estuary Program.
- Download our Eel Project Volunteer Flyer (PDF, 340 kB)
Fyke Nets: Large fyke nets are set in the mouths of tributaries for six to eight weeks each spring, catching the juvenile eels as they migrate upstream. Each net is checked every single day by two or more volunteers. Often, people sign up to check a net one or more specific days per week. It takes approximately 45 minutes to sample each day. All gear and materials are provided, but personal transportation to the site is required. Volunteers should be willing to work outside under variable conditions, wear waders into the stream, and work collaboratively within a team of students and volunteers.
Eel Mops: Eel mops are special devices made to mimic juvenile eel habitat. They are passive traps that are set in the water and checked for living things as often or as little as needed. In addition to glass eels, we often find invertebrates and other small fish as well! Learn How to Make an Eel Mop (PDF, 933 KB).
Eel Ladders: On their journey upstream, eels are confronted by barriers that prevent access to favorable habitats. At a few locations by dams, we set eel ladders that catch eels attempting to swim upstream. The eels are then counted, sized, and released above the dam. The ladders are checked twice a week during the summer sampling season.
Sample sites include:
- Richmond Creek in Staten Island
- Saw Mill River and the Center for the Urban River at Beczak in Yonkers
- Furnace Brook in Cortlandt
- Minisceongo Creek in West Haverstraw
- Indian Brook at Constitution Marsh in Cold Spring
- Quassaick Creek in Newburgh
- Fall Kill in Poughkeepsie
- Indian Kill in Staatsburg
- Black Creek in Esopus
- Saw Kill in Annandale-on-Hudson
- Hannacroix Creek in New Baltimore
Some Eel Project History
The Hudson River Eel Project began in 2008 with two sites, the Fall Kill in Poughkeepsie, and Crum Elbow Creek in Hyde Park. By 2014 the project expanded to ten sites, ranging from New York City to Albany County, with over 500 volunteers lending a hand (and learning a thing or two). Over its lifetime, the Eel Project has caught, counted, and released over 300,000 glass eels, helping these animals access better habitat.
Over the course of the project we have collected interesting data. In 2012, volunteers caught an average of 144 glass eels per day and in 2013, volunteers caught an average of 199 glass eels per day. This is a significant increase from previous years during which the average catch per day was around 20-30 eels. One of the key educational aspects of this project is bringing the data back to classrooms to have students interpret and learn from it.
Thank you for your support. In addition to hundreds of volunteers, the Eel Project is supported by many organizations and partners.
Please contact us to find out more and sign up to volunteer:
Chris Bowser, email@example.com