Chesapeake Bay Program - Information, data, maps, and publications about the Chesapeake Bay, the Chesapeake Bay Ecosystem, and the Chesapeake Bay Program.

Like the Japanese shore crab pictured above, non-native or so-called exotic species are among the more insidious and confusing threats to the health of our coastal ecosystems. Plants and animals introduced accidentally or even deliberately can cause unexpected harm - introduced plants like hydrilla or Phragmites can displace native plants, and the green crab, an invader from the Baltic Sea, ...