Effectiveness of a Fish Passage Facility for Anadromous River Herring Recruitment
Migratory stocks of river herring, alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) have declined as a result of overfishing, poor water quality, and loss of spawning and nursery habitat. To provide access to previously blocked spawning and nursery areas, fish passage facilities have been installed at stream blockages. In 1997, a fish ladder was installed on Unicorn Lake, a tributary of the Chester River in Maryland. In 1998 and 1999, we evaluated the effectiveness of the fish ladder for passing adult river herring and surveyed the upstream habitat for juvenile...
