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Politics : Impeach George W. Bush
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To: longnshort who wrote (88637)12/27/2007 10:15:12 PM
From: SeachRE  Read Replies (1) of 93284
 
Oysters are filter-feeders: they draw water in over their gills through the beating of cilia. Suspended food plankton and particles are trapped in the mucus of the gills, and from there are transported to the mouth, where they are eaten, digested and expelled as feces or pseudofeces. Feeding activity is greatest in oysters when the water temperatures are above 50°F (10°C). Healthy oysters consume algae and other water-borne nutrients, each one filtering up to five litres of water per hour. Scientists believe that the Chesapeake Bay's once-flourishing oyster populations historically filtered the estuary's entire water volume of excess nutrients every three or four days. Today that process would take almost a year,[2] and sediment, nutrients, and algae can cause problems in local waters. Oysters filter these pollutants, and either eat them or shape them into small packets that are deposited on the bottom where they are harmless(from elementary Wikipedia).
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