Shad abundance has surged in four Chesapeake Bay rivers, surpassing restoration goals in the Potomac and Rappahannock. While shad populations are critically low along the Atlantic coast, scientists hope to see rising trends continue in these two waterways. Shad spend most of their adult lives in the ocean, migrating into freshwater rivers and streams to spawn. Their return brings food to the Bay in the form of protein-rich eggs, adult shad that can be captured during the spawn and a new generation of shad that can offer forage to striped bass, bluefish and other species as they return to the sea.
Once one of the most valuable fisheries in the Bay, shad populations have declined in recent decades due to pollution, historic overfishing and the construction of dams that block the fish from reaching their spawning grounds. The Bay Program tracks the abundance of American shad in the James, Potomac, Rappahannock, Susquehanna and York rivers as an indicator of watershed health. Collectively, these five waterways account for about 90 percent of the Bay’s shad population, and each has its own population target.
Between 2000 and 2014, shad abundance in the Bay increased from 11 percent to 44 percent of the goal. The Potomac River has seen the most consistent rise in returning shad, but the Rappahannock has also seen notable highs. In 2014, abundance in the Potomac and Rappahannock reached 130 and 110 percent of the rivers’ respective targets.
Scientists attribute these increases to a series of factors, including improvements in water quality; a resurgence in underwater grass beds; moratoriums on shad harvest; an increase in habitat available to migratory fish; stocking efforts that reprint fish to rivers and kick-start local populations; and the overall suitability of the Potomac, in particular, as shad habitat.
“The Potomac River shad population has surpassed its sustainability target,” said Jim Cummins, director of living resources for the Interstate Commission on the Potomac River Basin and co-chair of the Bay Program’s American Shad Indicator Action Team. “But we want to see recovery continue until a robust population is once again providing ecological benefits and supporting a fishery that includes some recreational harvest. Hopefully, in the not too distant future, anglers will be able to enjoy shad on the table and at the end of a line.”
Shad abundance remains negligible in the upper James and Susquehanna and variable in the lower James and York. Some variability is natural, but the continued scarcity of shad in the upper James and Susquehanna can be attributed to large dams. Through the Chesapeake Bay Watershed Agreement, the Bay Program has committed to opening more stream miles to migratory fish and improving our capacity to understand the role forage fish populations play in the Bay ecosystem.
American eel numbers are up in the headwater streams of Shenandoah National Park, following the 2004 removal of a large downstream dam.
Significant increases in upstream American eel populations began two years after the Rappahannock River's Embrey Dam was removed and have continued nearly every year since, according to a report released last week by the U.S. Geological Survey (USGS), U.S. Fish and Wildlife Service (USFWS) and National Park Service (NPS) researchers.
Image courtesy EricksonSmith/Flickr.
Dams can act as travel barriers to American eels, which undertake long-distance migrations from their ocean spawning grounds to freshwater streams along the Atlantic coast. While American eels can surpass substantial natural barriers--like the rapids of the Potomac River's Great Falls, for instance--dams pose a more difficult obstacle and have contributed to the widespread decline in American eel populations. Dam removal, therefore, could have long-term benefits for eel conservation.
"Our study shows that the benefits of dam removal can extend far upstream," said USGS biologist Nathanial Hitt. "American eels have been in decline for decades and so we're delighted to see them begin to return in abundance to their native streams."
Embrey Dam, which once provided hydroelectric power to Fredericksburg, Va., was breached in 2004 following years of work by nonprofit organizations and city, state and federal government agencies. Its removal was intended to benefit more than the American eel, however, as dams can impact a number of fish that must migrate up rivers to spawn.
"Shad, herring and striped bass are also using reopened habitat on the Rappahannock River," said Alan Weaver, fish passage coordinator for the Virginia Department of Game and Inland Fisheries. "It's exciting to see a growing number of species benefiting from dam removal in Virginia."
Learn more about American eel abundance in Shenandoah National Park.
On a brisk Saturday in October, 160 volunteers collect 3.5 tons of discarded children’s toys, plastic bottles, crushed automobiles, and various other kinds of trash from their local Chesapeake Bay tributary, the Rappahannock River.
The volunteers, many of them students at the University of Mary Washington and Mountain View High School, are participants in a clean-up hosted by Friends of the Rappahannock, a non-profit advocacy, restoration and education organization based in Fredericksburg, Virginia.
Friends of the Rappahannock – also known as “River Friends” or “FOR” – hosts fall and spring clean-ups each year. But its environmental efforts span the entire year. From engaging at-risk youth in streamside restoration activities to helping residents construct rain gardens in their yards, FOR’s volunteers are saving the Chesapeake Bay in a number of ways.
“We give people the chance to make a difference, to go home feeling that whatever they’ve done, they’ve made some type of positive impact,” says John Tippett, FOR’s executive director. “Providing a range of these fulfilling opportunities is what keeps our volunteers coming back.”
FOR’s diverse collection of volunteer programs are critical for a river so geographically expansive: the Rappahannock travels from the Blue Ridge Mountains to the Chesapeake Bay, transecting landscapes that range from agricultural (in the headwaters and tidewaters) to urban (near Fredericksburg).
Along the its course, the river experiences nearly every type of pollution pressure that can be found in Virginia: from livestock manure on farm fields to fertilizer from suburban lawns.
How does FOR help reduce these pollution pressures? The group’s strategy varies from community to community. FOR takes into account the pollution source (anything from animal waste to fertilized lawns), but also considers the interests of residents, the involvement of local governments, and the availability of staff and volunteers.
“We strive to develop a variety of activities and volunteer opportunities to engage our members and other community members,” explains Sarah Hagan, volunteer coordinator at FOR.
Here are a few of our favorite ways you can get involved with FOR:
Contact FOR to get involved today! And if you don’t live near the Rappahannock, don’t worry; there are plenty of small, volunteer-based watershed organizations throughout the Chesapeake Bay region that you can get involved with!
MORE from FOR:
Images courtesy Friends of the Rappahannock