Sentences with phrase «ships as ballast»

Not exact matches

In the 40s he gradually forsook pay diving for treasure hunting, prowling from one wrecksite to another, most of them located on tips from local fishermen who had worked over round rocks but never figured them as the ballasts of old ships.

Stop the overseas ships known regionally as «salties,» and you can stop their ballast invasions.

Although the Isle Royale boat is almost toy - sized compared with the freighters that ply the Great Lakes, Green contends the relatively simple chlorine treatment could be scaled up to the biggest boats on the lakes as an emergency line of defense that would be far stouter than the saltwater flushing — the only protection for the lakes until ballast treatment systems are required for all overseas ships, which likely won't be until 2021 at the earliest.

Rats, the world's foremost invasive species, have traveled the world with explorers and traders; so have tropical fire ants, which genetic studies suggest have hitchhiked from southwestern Mexico to Asia and beyond starting in the 16th century in soil used as ballast in Spanish ships.

The stowaways can arrive either as biofouling on the outside of the ships or via water in the ballast tanks.

As a child he showed considerable initiative in fossil hunting, even collecting specimens from the discarded ballast of cargo ships.

The imported red fire ant, as it is colloquially known, came to the U.S. from its native South America sometime in the 1930s or «40s, likely as a stowaway in ship ballast.

Empty ships routinely take on seawater as ballast before they set sail, to keep them stable while at sea.

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.

Much attention has been given to migration of vermin on board ships, and the transport of larger organisms such as algae and jellyfish in ballast water.

[4] The point derived the name Ballast Point from the fact that the early Yankee skippers would have stones gathered from Ballast Point to serve as ballast in their ships during their returns around Cape Horn to their home town, Ballast Point from the fact that the early Yankee skippers would have stones gathered from Ballast Point to serve as ballast in their ships during their returns around Cape Horn to their home town, Ballast Point to serve as ballast in their ships during their returns around Cape Horn to their home town, ballast in their ships during their returns around Cape Horn to their home town, Boston.

The point derived its name from the fact that the early Yankee skippers would have stones gathered from Ballast Point to serve as ballast in their ships during their returns around Cape Horn to their home town, Ballast Point to serve as ballast in their ships during their returns around Cape Horn to their home town, ballast in their ships during their returns around Cape Horn to their home town, Boston.

By this time little transports were coming with supplies on a haphazard schedule, and when the Clipper ship Aranzaya arrived in 1795, she brought three workmen and the necessary timber to build a fort at Ballast Point, or as it was known at that time, Point Guijarros.

The oldest Anglican church in Central America stands in Belize City, a monument to the slaves who built it between 1812 and 1820 using bricks originally carried as ships» ballast.

Other Belize City points of interest: the Swing Bridge, Supreme Court Building, Government House of Culture and St. John's Anglican Church, constructed in 1812 from bricks brought as ballast from European Sailing ships.

The oldest Anglican Cathedral Church in Central America, St. John's Cathedral, was built in 1812 from bricks brought as ballast from European sailing ships.

There are many actions which can be taken to reduce, but not eliminate, the risk of alien species invasions, such as the treatment of ballast water in cargo ships and wood products, strict quarantine applied to crop and horticultural products, and embargos on the trade and deliberate introduction of known invader species.

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.

(GML Heritage 2018) SYDNEY, AUSTRALIA — According to a BBC News report, indigenous Australians made traditional tools from flint cobbles carried to Australia as ballast on British ships in the...

The space under the floor is filled with insulation and tiles that serve as ballast, which helps the ship lie lower in the water and makes it easier to pass under the bridges.