The Mystic River Watershed Association and the MA Division of Marine Fisheries have been counting American eels at the Upper Mystic Lake dam in Medford since April 1st. The eels wiggle up the eel-way next to the fish ladder and remain in a box until MyRWA removes them to count them. The eels are then released into the Upper Mystic Lake. The eels are born in the Sargasso Sea, and are typically just two to four inches long by the time they reach the Mystic Lakes. In 2013, 13,019 eels were recorded at the Upper Mystic Lake dam, whereas in 2012 2,784 eels were counted.