Sentences with phrase «by ballast water»

The McGill team chose to work on the problems created by ballast water.

Circumstantial evidence suggests that a previously unreported strain of cholera found in oysters and fish - gut contents in Mobile Bay, Alabama during 1991, was transported there by ballast water from ships that arrived from Latin America, which had an ongoing cholera epidemic.

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.

The notorious sea creature shipped around by ballast waters devastated Black Sea fisheries in the 1990s.

Not exact matches

The recent infestation of nonnative zebra mussels throughout North American waters was probably started by ships carrying the shellfish in ballast water.

There is a separate IMO international convention on management of ballast water — signed in 2004 — that would come into force when ratified by a required number of 30 states.

Last year, for instance, a team led by aquatic ecologist Gregory Ruiz of the Smithsonian Environmental Research Center in Edgewater, Maryland, found that ballast water from ships entering the Chesapeake Bay contained Vibrio cholerae, the bacterium that causes cholera.

The survey revealed that some «major trading nations» are very worried by the danger of ballast water and have adopted their own procedures to prevent the escape of exotic organisms.

While the marine life in ships» ballast water and attached to ship hulls explains the invasion of many species in the sea, the forams, and similar bottom - dwellers not found in the water or attached to hulls, are believed to be rarely moved by ships.

A United Nations treaty agreed in 2004 requiring ships to install kit to kill off biological stowaways in their ballast water has still not been ratified by enough nations to come into force.

But a study by the environment group WWF suggests that the economic cost of dealing with existing invasive species from ballast water is more than three times the cost of preventing more.

The 70,000 or so vessels that would be covered by the treaty transport more than 7 billion tonnes of ballast water round the world each year, says David Smith, head of technical services at the Plymouth Marine Laboratory in the UK.

These biological time bombs were meant to be defused by a UN treaty agreed in 2004 requiring big ships to filter and disinfect ballast water before dumping it.

Accidental introductions of non-native species has been of increasing concern since the 1980s when human - mediated transportation, mainly related to ships» ballast water, was recognised as a major route by which species are transported and spread.

Future simulations will also have to take into account which engineering solutions for ballast water treatment will eventually be adopted by port authorities.

Sixty years passed before the placid waters around Ballast Point were again disturbed by deep - sea keels, when Sebastián Vizcaíno anchored on November 10, 1602.

Ocean acidification, rising ocean temperatures, declining sea ice, and other environmental changes interact to affect the location and abundance of marine fish, including those that are commercially important, those used as food by other species, and those used for subsistence.16, 17,18,122,19,20,21 These changes have allowed some near - surface fish species such as salmon to expand their ranges northward along the Alaskan coast.124, 125,126 In addition, non-native species are invading Alaskan waters more rapidly, primarily through ships releasing ballast waters and bringing southerly species to Alaska.5, 127 These species introductions could affect marine ecosystems, including the feeding relationships of fish important to commercial and subsistence fisheries.

Via Milwaukee Journal Sentinal: - «Frustrated by the mounting number of invasive species arriving in the bellies of overseas freighters, some conservationists are proposing a simple but radical solution: Ban the ships from the Great Lakes until they can figure out how to stop discharging contaminated ballast water.