Conservationists, environmentalists, and seafood lovers alike have both positive and negative news regarding two of Maryland’s most beloved aquatic neighbors. Oyster populations in the Chesapeake Bay are increasing, partly due to volunteer efforts, while blue crab populations have dropped to one of the lowest levels recorded in past decades by aquatic researchers.
As the crab population goes down, the oyster population in the bay has been estimated at over 7.5 billion, a significant increase from 2005’s estimated 2.4 billion oysters. Oysters improve water conditions by filtering excess nutrients from the Chesapeake Bay, preventing algae buildup that can remove oxygen from water and endanger fish and crabs.
An oyster sanctuary located near the long-abandoned man made island of Fort Carroll, established before the tragic collapse of the Key Bridge, has had over six million oysters deposited since 2008 and is a continued source of community support to strengthen the bay’s health.
While Chesapeake Bay Foundation boat captain Ben Carver feared that the bridge collapse would disrupt or destroy the artificial oyster sanctuary, the reserve has held strong and over 125,000 new oysters have been planted there this year alone.
“Oyster restoration is one of the Chesapeake Bay’s greatest success stories, and this latest stock assessment proves it. Oyster abundance in restored oyster sanctuaries has increased five-fold, even higher than the increase observed throughout Maryland,” said Chesapeake Bay Foundation’s Maryland Executive Director Dr. Allison Colden.
She also expressed optimism for the future of Maryland’s oyster population amid ongoing conservation efforts.
“The strong results should encourage us to maintain, and even accelerate, the momentum for large-scale oyster restoration,” she said.
Blue Crab Population Declining But ‘We’re Still OK’
Recently, Maryland’s blue crab population was estimated at 238 million, still higher than 2022’s all-time low estimate of 226 million. While there are no reasons pinpointed for the decline in the blue crab population, experts have largely noted habitat destruction and a rise in invasive predator species can contribute to a decrease in numbers.
“This year’s total estimated abundance is the second lowest in the history of the survey, which has operated since 1990,” read a Maryland Department of Natural Resources survey in late May about the crab population. “The lowest was 226 million crabs in 2022. The juvenile abundance of 103 million in 2025 was a decrease from 138 million last year, and the third lowest abundance on record, after 2021 and 2022.”
With the declining numbers, some environmentalists, conversations and Chesapeake Bay experts are concerned.
“The latest blue crab numbers are extremely distressing. Blue crabs are a staple on our plates, in our water, and in our culture,” said Chesapeake Bay Foundation’s Virginia Executive Director Chris Moore.
Nonetheless, the population has been reported as “stable” by a joint study between the Maryland Department of Natural Resources (DNR) and the Virginia Institute of Marine Science.
“We saw a very high mortality rate among blue crabs this winter, likely due to several cold snaps,” said Mandy Bromilow, blue crab manager at Maryland Department of Natural Resources. “With the results of the stock assessment next year, we hope to have more insight on what could be contributing to the ongoing low juvenile recruitment and what we can do to support the Chesapeake Bay’s blue crabs. Until then, we need to maintain caution in our management approach for blue crabs.”
Despite the challenges, Bromilow is encouraged for the road ahead for Maryland’s famous crustacean.
“We’re still OK,” Bromilow said. “It’s not ideal, but it’s not something where we’re super concerned.”
Moore emphasized the importance of environmental conservation.
“We must protect them in order to ensure their important role in the Chesapeake Bay ecosystem,” he said, “and preserve sustainable harvests for the most valuable commercial fishery in the bay.”
