Sentences with phrase «where ballast water»

The organisms can cause havoc to marine life in the ports where ballast water is off - loaded, because their natural predators are not there to keep them in check.

Not exact matches

In 1991, the IMO adopted guidelines which recommend that ships should avoid taking on ballast in shallow areas and during toxic blooms of marine algae; keep accurate records of where and when ballast is loaded; exchange ballast water at sea, where toxic organisms are rare; and discharge sediments into approved areas at the port of destination («End of the line for deadly stowaways», New Scientist, 24 October 1992).

That includes San Francisco Bay, where the majority of inhabitants are alien species such as Chinese mitten crabs, New Zealand sea slugs and Japanese gobies — all brought by ballast water.