The Great Hudson River Fish Count is an annual event, sponsored by the DEC's Hudson River Estuary Program and the Hudson River National Estuarine Research Reserve. Each summer, organizations all along the Hudson River and New York Harbor participate at riverfront sites to collect, count, and catalog fish species. During the fish count, participating organizations encourage visitors to help collect fish using seine nets, minnow traps, or rods and reels. Seining involves pulling a 30-foot net through the water and checking out the fish, crabs, and other river-life caught in the mesh. The fish are identified, counted and released back into the river.