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Salinity in the water column varies with the depth of the
water. In the winter there is a greater amount of fresh water
in the Yaquina Bay, much like any other salt water estuary.
In any large body of saltwater rain and fresh water runoff
tends to be greater nearer the surface.
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This is because salt adds density to the water making it
heavier. The lighter fresh water will try to ride at the top
of the water column. Since our oysters usually ride about
14" deep it is important to overcome the salinity issue
by planting as far down river as possible so we will remain
as close to the ocean as we can.
The Yaquina Bay exchanges about 75% of the bay's water with
new ocean water every tide cycle. This is very unusual for
an oyster producing estuary. The advantage this gives during
high flood winters is important if a large river system drains
to the ocean through the estuary.
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