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news-002499		Biologists study options for managing ballast water invasions | News | Notre Dame News | University of Notre Dame			.html	text/html	579	21	45	These results emphasize the importance of implementing improved methods of ship-board treatment (through such methods as adding toxins to ballast water, filtration units on decks, U.V. radiation or centrifuges), and moving beyond the current practice of ballast water exchange in which ships pump out ballast water in the middle of the ocean.p. Biologists study options for managing ballast water invasions |	cache/news-002499.html	txt/news-002499.txt