NOAA Fisheries has developed a comprehensive management plan for the Merrimack River watershed aimed at restoring these important fish, and the habitats on which they rely.
The Merrimack River watershed is the fourth largest in New England, and historically supported great runs of migratory fish. Over the past 200 years, their numbers have dramatically declined, negatively impacting the ecology of the watershed and coastal waters. Along with our partners, NOAA Fisheries has developed a comprehensive management plan for the watershed aimed at restoring these important fish, and the habitats on which they rely.
 Merrimack River near North Chelmsford, MA. Credit: NOAA Fisheries/Ben German
Dams, Fish, and Why They Don't Mix
Diadromous fish spend part of their life in freshwater, and part in saltwater. Prior to pervasive dam construction in the late 18th and early 19th century, they were abundant in the Merrimack River watershed.
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