Michael W. Fincham producer/director; Jack Greer and Dan Terlizzi, executive producers. 2008. UM-SG-DV-2008-03. $7.50.
Green crabs from the Baltic Sea. Zebra mussels and rapa whelks from the Black Sea. Seagrasses from Japan. Clams from Korea. Dozens of alien species are infiltrating hundreds of American harbors, bays, and rivers. Do these invaders pose a threat to the Chesapeake Bay and its complex ecosystem?