HERRING MONITORING
Beginning in April 2012, MyRWA volunteers began monitoring river herring at the Mystic Lakes Dam fish ladder for the very first time. Volunteers help count fish and support data collection to estimate run size in the Mystic River. Previously the dam prevented river herring from reaching their native spawning grounds. In the past, a bucket brigade was assembled to hoist the fish over the dam. Thanks to the Upper Mystic Lake Dam Rehabilitation project, a new fish ladder allows passage for river herring.
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WHAT IS A HERRING?A herring is a type of fish. The Mystic River Watershed supports two species of herring: Alewife (Alosa psuedoharenous) and Blueback Herring (Alosa aestivalis). Both species, collectively called river herring, are anadromous. This means they spend most of their lives at sea and return to rivers—like the Mystic—to spawn, or lay their eggs. Click the picture below for ID information.
WHY MONITOR RIVER HERRING?In colonial times and earlier, herring in the Mystic River were extraordinarily abundant. But from the 1900’s until today a much smaller population of river herring is present. Since the dam has been rebuilt this is the first time that a fish ladder will be in place to allow an accurate count of herring. According to the Herring Alliance some river herring runs on the Atlantic Coast have declined by 95% or more over the past 20 years. In 2006 the National Marine Fisheries Service designated river herring as a species of concern. Population decline may be associated with numerous factors including by-catch, habitat loss and degradation, water pollution, poaching, access to spawning habitat, and natural predators.
WHAT IS MyRWA DOING?The Herring Monitoring Program will monitor herring swimming through a fish ladder to estimate run size. Counting will occur from April 1 – mid June following the Division of Marine Fisheries protocol. The goal of the herring monitoring program is to collect valuable data about herring populations as they make their way up the Mystic River to reach their native spawning grounds and to educate the public about river herring. We hope that through participation, volunteers will increase their understanding and stewardship of the Mystic River and the watershed.
This program would not be possible without the support and collaboration with:
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EELSMyRWA also monitors American Eel (Anguilla rostrata) passing through the Mystic Lakes Dam. Eels are collected in buckets, counted then returned to the Upper Lake. American Eel are catadromous fish, leaving their habitat to spawn in the Atlantic Ocean.
STORY OF THE WEEK "I brought a couple of my son's friends to the dam to count the herring. We talked about the certain type of fish that migrate from the ocean to fresh water to spawn. We talked about how that journey has become more and more difficult or impossible because of dams, water diversions, construction and other human interventions. But, that nature persists once given a chance, hence the ladder.
RESOURCES
HOW CAN YOU HELP? Volunteer to be a fish monitor! No previous experience or knowledge is required. Please attend an upcoming volunteer training. To find out more about this volunteer opportunity or the project, please contact Meghna at herring@mysticriver.org.
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