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Re: E-M:/ Turbid waters....Lakes St. Clair and Western Lk Erie



The Maumee River larval walleye in the first days after hatch are very vulnerable to predators.  They are at mercy of the current drift down to the river estuaries where the zooplankton food is in the nursery areas.  The annual turbidity of the river helps hide the fry.  The small walleye are less than 10mm using the yolk sac for the wild current ride.  Once in Maumee Bay the yolk sac is gone on day 5 when the fry must immediately find exact proper size zooplankton or die.  Nature requires everything in perfect timing.  The turbid nutrients coming down river to feed zooplankton, the water temperature for perfect zooplankton hatch, and walleye fry do not hit perfect conditions and timing every year.  Thus you have the poor to strong year class cycles. There are other factors, but you can check for more information with the Ohio fishery biologist. 
 
MAUMEE, Ohio -- The pioneers had an apt description for many of the rivers they encountered on the trip west: Too thick to drink, too thin to plow.  That description would fit half of the rivers in the Midwest after days of alternate rain, snow and melting, including the Maumee, which the sign on the Highway 20 Bridge identified as an "Ohio Scenic River."
 
In a message dated 4/3/2008 2:34:15 A.M. Eastern Standard Time, ajs@sagady.com writes:
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Enviro-Mich message from "Alex J. Sagady & Associates" <ajs@sagady.com>
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Yesterday, Wednesday, April 2, the NASA
Moderate Resolution Imaging Spectroradiometer (MODIS) TERRA
satellite passed over the Great Lakes region after
a previous couple of days of rain we had in the lower lakes
region.

Satellite imagery from yesterday shows that the rains brought
considerable turbidity to Lake St. Clair and Western Lake
Erie....most likely from poor soil erosion control on
agricultural fields in Southern Ontario and the Eastern and
Southern Land areas of Ohio and Michigan for the
Western Lake Erie basin.

The overall satellite imagery from yesterday shows these two
regions to have the worst problems with turbid water pollution
in the entire Great Lakes basin yesterday.    Some turbidity is
also noted at the mouth of the Saginaw River at Saginaw Bay.

After the better part of a century of soil conservation  efforts, you
really have to wonder why such serious soil erosion/turbidity problems still exist in
Ontario's Thames River, Michigan's Raison River, and Ohio's
Maumee, Portage and Sandusky Rivers.

View of Lake St. Clair and Western Lake Erie:

http://www.sagady.com/turbidity/WestLkErieandLkStClair04022008.jpg

Closeup on Lake St. Clair  (Thames River mouth at SE corner of the lake):

http://www.sagady.com/turbidity/LakeStClair04022008.jpg

Closeup on Western Lake Erie:

http://www.sagady.com/turbidity/WestLkErie04022008.jpg

Entire Great Lakes basin (WARNING- 9 mb large file):

http://www.sagady.com/turbidity/MODISTerra04022008.jpg



==========================================
Alex J. Sagady & Associates        http://www.sagady.com

Environmental Enforcement, Permit/Technical Review, Public Policy,
Expert Witness Review and Litigation Investigation on Air, Water and
Waste/Community Environmental and Resource Protection
Prospectus at:  http://www.sagady.com/sagady.pdf

657 Spartan Avenue,  East Lansing, MI  48823 
(517) 332-6971; (517) 332-8987 (fax); ajs@sagady.com
========================================== 


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