On the Choptank River, which feeds the Chesapeake Bay from Maryland's Eastern Shore, Nick Hargrove and Derek Wilson still work the water. When a reporter visited them in 2020, they were among the youngest watermen in Maryland, Hargrove 34 and Wilson 32. They may be part of the last generation. That possibility traces back to a parasite nobody saw coming.
In 1959, Haplosporidium nelsoni appeared in the Chesapeake Bay. The scientists would name it MSX. It had crossed from Delaware Bay, where it was detected two years earlier, and it moved through the oyster beds with a speed that had no precedent in living memory. By 1961, MSX had killed more than 90 percent of Virginia's farmed oysters. The harvest of planted stock fell from 3.3 million bushels in 1959 to 361,792 by 1983. An estimated 1.8 billion animals, gone.
The watermen of the Eastern Shore had survived a great deal before MSX. They'd survived the Oyster Wars of the nineteenth century, when Maryland and Virginia oystermen fought over disputed waters with enough violence to require the governor's intervention. They'd survived a century of overharvesting that had already reduced the catch from its peak of roughly 20 million bushels a year in the 1880s. Captain John Smith had described oysters lying "as thick as stones" in the early 1600s, their reefs rising near the surface as navigational hazards. By the time MSX arrived, the abundance was already a memory. But the watermen were still working. MSX turned depletion into collapse.
Then came the second blow. Around 1986, a native parasite called Dermo, present in the Bay since at least 1949 as a chronic nuisance killing perhaps 30 percent of oysters annually, transformed. A hypervirulent phenotype emerged. Researchers at the Virginia Institute of Marine Science would not identify it until 2021, working through 8,355 archival oyster samples spanning nearly six decades. The intensification was an evolutionary response to pressures created by MSX itself. One invading parasite had made the native one lethal. Dermo became capable of killing more than 70 percent of host oysters within months.
Between MSX, the transformed Dermo, overharvesting, and habitat destruction, the Chesapeake's oyster population fell to 1 to 2 percent of its historical baseline. In the 2003-04 season, Maryland watermen harvested 26,000 bushels. License holders dropped 42 percent in Maryland, 88 percent in Virginia since 1980.
Federal and state partners restored more than 2,300 acres of reef across ten Chesapeake tributaries by end of 2025, making it the world's largest oyster restoration project. Maryland's overall oyster population tripled since 2005.
The restoration was supposed to answer this. The 1993 Maryland Oyster Roundtable, forty experts convened in crisis, produced an Action Plan that launched what became the world's largest oyster restoration. NOAA hit its goal by the end of 2025. In Harris Creek, all 348 acres of restored reef met success criteria. In the Piankatank River, monitoring found 425 oysters per square meter. Maryland's overall oyster population tripled since 2005.
Those numbers read differently from the deck of a workboat. In 2009, the state established 51 sanctuaries, closing roughly a quarter of the Bay's waters to harvest. Watermen estimate more than half the best oyster bars are now off-limits. The season was shortened. Saturday harvest days eliminated. Bushel limits tightened. The feature that made the restoration politically viable, protecting reefs from harvest, determined who paid for it.
When Wilson spoke to a reporter in 2020, he had no other job. He had a wife, two kids, and $4,000 a month in expenses. He sold a bushel for thirty dollars, worked four days a week, twelve bushels a day. His four-year-old asked on Wednesdays why Daddy wasn't oystering.
And now the water itself is shifting. The Bay has warmed by 0.24°C per decade over thirty years, more than double the global ocean average. Warmer water favors Dermo. Coastal acidification threatens the calcification oysters need to build shell. The restored reefs are working inside a system that is moving beneath them.
The 2025-26 season was supposed to vindicate the whole effort. Instead, Maryland watermen landed just over 188,600 bushels between October and January, 44 percent below the five-year average. Governor Wes Moore appealed to the Trump administration for disaster aid in February. His proposed budget would cut state investment in oyster restoration by over 40 percent. The same governor who announced the restoration's completion in August now proposes to defund its continuation.
Monitoring criteria count oysters per square meter. They do not count Wilson's kids. He will grow up in a Chesapeake where the restored reefs may hold, or may not, against warming water and acidifying chemistry. Whether there will be watermen left to work them, the monitoring data has nothing to say about that.