Computer simulation helps alewives return to their spawning grounds

摘要

A fish ladder built 60 years ago at Third Dam on Somes Brook in Somesville, Maine, (image at right) had deteriorated to the point that it prevented diadromous alewives (Alosa pseudoharengus) from migrating to their freshwater spawning habitat. To address this problem, Woodlot Alternatives, Inc. (Topsham, Maine) was hired by a private land trust to determine how the fish ladder could best be restored.