Ballast water is taken on board ship to maintain their stability when laden. When a ship is loaded with cargo it empties its ballast tanks. In this way ballast water sucked up in one open port can be
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Links:
[1] http://admin.indiaenvironmentportal.org.in/news/illegal-aliens-ballast
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/financial-times-london
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
