American eels are migratory fish that are hatched in the Atlantic Ocean and enter rivers as tiny “glass eels” each spring. The species is in decline over much of its range, and baseline studies are needed for conservation.

Teams of scientists and students collect glass eels using net and trap devices on several Hudson River tributaries. Juvenile fish are counted, weighed, and released to better habitat upstream, often above dams. Help protect this critical species. For adults. Free. Programs require pre-registration. To register, visit www.teatown.org or call 914-762-2912 x 110.