A persistent "dead zone" seems to have settled into southern Hood Canal, where oxygen levels remain so low that many bottom-dwelling creatures have probably perished. State officials continue to add fishing restrictions in Hood Canal, and nobody seems to know when the nightmare will end.
Normally, by this time of year, dissolved oxygen in deep water has recovered to safe levels due to mixing from winter weather and inflow from ocean waters. Last year, the canal never fully regained its health. And this year, something terrible seems to be at work.
The amount of oxygen in southern Hood Canal is 25 percent less than it has ever been during winter months. "It is very disturbing that it is staying so low for so long," said Jan Newton, an oceanographer with the state Department of Ecology.
In Lynch Cove at the tip of the canal, dissolved oxygen levels remain at or below 1 part per million. Generally, levels below 5 are considered stressful, and those below 3 may be deadly."
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http://www.thesunlink.com/redesign/2004-03-13/local/424140.shtml