Scientists in Louisiana are reporting development and successful testing of a new cost-effective system to kill unwanted plants and animals that hitch a ride to the United States in the ballast water of merchant ships. These so-called "invasive species," such as the notorious zebra mussel, devastate native organisms and infrastructure and cost taxpayers billions of dollars annually.
In the study, Dorin Boldor and colleagues point out that invasive species often travel in ballast tanks of international cargo ships. Ships pump sea water into these tanks for stability when a vessel leaves port with little or no cargo. They dump the water at their destination -- along with zebra mussels, Asian clams and other organisms that may pose environmental risks.
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