What’s causing sharp drop in Chesapeake Bay’s crab population?

Crabs being sorted in Maryland. (Carolyn Van Houten/The Washington Post)
Habitat loss, especially the reduction of underwater grasses that shelter young crabs, may be playing a role, experts said. Changes in currents, winds and storms, pollution and runoff, and low-oxygen “dead zones” caused by algae blooms may also contribute, experts said.
“They’re a short-lived species and the biggest thing we’re seeing is a decline in the number of young crabs entering the population,” said Chris Moore, the Chesapeake Bay Foundation’s Virginia executive director. “That long-term trend of fewer young ones is very concerning.”
Healthy blue crabs are vital to the bay’s ecosystem. They eat worms, clams, and smaller crabs, and are prey for fish, great blue herons, and sea turtles. Blue crabs also generate $50 million to $80 million annually for the commercial crabbing industries of Maryland and Virginia, experts said.
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