The blue crab population in the Chesapeake Bay (the largest estuary in the United States, stretching 200 miles through Maryland and Virginia) has jumped 46% to an estimated 349 million crabs, its highest level since 2019, according to the region's annual winter dredge survey. The surge was driven largely by a 121% rise in juvenile crabs and a 43% increase in adult males, though the adult female population fell 25% to 81 million — well below the management target of 196 million — leaving scientists without a clear explanation for the divergence. Researchers are urging caution, noting that the rebound lifts numbers only to long-term averages and that past survey peaks have not always translated into real-world fishery gains, with ongoing threats including invasive blue catfish, climate-driven cold shocks, and habitat loss continuing to cloud the species' long-term outlook.