Using a strain of herpes to attack invasive carp in Australia.

While it could work out really, really well... it might not. Wouldn't be the first virus to jump species unexpectedly.

http://www.livescience.com/54643-eradicating-australian-carp-using-herpes.html
Quote
To rid their streams and rivers of invasive European carp crowding out native freshwater species, officials plan to begin introducing a strain of the herpes virus — Cyprinid herpesvirus 3 (CyHV-3), or “carp herpes” — into fish populations.

In a statement released May 1, Australian Department of Agriculture and Water Resources (DAWR) officials described their National Carp Control Plan, which will be developed over the next two and a half years at a cost of approximately AU$15 million (about US$11.2 million) and potentially deployed by 2018.

Research by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) has already determined that the virus kills European carp quickly, and that it does not develop in native fish, in other introduced fish species or in other animals — including humans.

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