In summary, siltation from upstream led to shrinkage of the water surface area, decrease of salinity and prolific growth of invasive fresh water aquatic weed infestation, all of which had a serious negative impact on habitat of wildlife and fishery resources.
42.
An "'aquatic weed harvester "', also known as a "'water mower "', "'mowing boat "'and "'weed cutting boat "', is an aquatic machine specifically designed for inland watercourse management to cut and harvest underwater weeds, reeds and other aquatic plant life.
43.
:: then in return I will agree to write the article " Aquatic weed control machine " with you over the next few days, and we will submit it for a joint talk ) 06 : 45, 19 January 2010 ( UTC)
44.
Records of alligator attacks kept by the Game and Fresh Water Fish Commission show that people also were bitten when they let their guard down _ while raking the aquatic weed hydrilla from a lake, walking to the restroom in a campground, retrieving golf balls from a pond or swimming.
45.
At an EPA research laboratory in Athens, Ga ., studies showed that an enzyme produced by a common aquatic weed, parrot feather, effectively destroyed trinitrotoluene, better known as TNT . This has led to several successful pilot projects in which artificial wetlands removed the chemical from water that had flowed under military firing ranges.
46.
In 1993, the OTA estimated that a total of $ 100 million is invested annually in invasive species aquatic weed control in the US . Introduced rats cause more than $ 19 billion per year in damages, exotic fish cause up to $ 5.4 billion annually, and the total costs of introduced weeds are estimated at around $ 27 billion annually.
47.
Now, after five years of laboratory study by the Agriculture Department's Aquatic Weed Control Research Unit in Fort Lauderdale and Gainesville to insure that the bug itself does not become a nuisance, researchers have set their hopes on the snout beetle, a docile, pudgy weevil about half an inch long that eats only melaleuca and prefers the tree's new leaves and flower buds.
