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Nice read Mike and thanks for sharing. Not sure I agree on the Saginaw Bay predation but glad they are going to start controlling them here in 2015. Heard that would happen when they caught up with Thunder Bay we were next. See string after string of them in early May going out to the shallows to feed on the fish. Hopefully will see less waves of them in 2016.
 

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A cormorant diet study was conducted in Saginaw Bay in 2013-2014 at Little Charity Island and Spoils Island. Stomachs were collected from cormorants from April to September and diet analysis conducted by USGS. Cormorants consumed a variety of prey, with round goby, shiners, and nongame fish making up a majority of the diet. Predation on yellow perch was higher in spring compared to the rest of the breeding season, but overall perch consumption was negligible.
Reducing the cormorants increases gobies, shiners etc.; more food options for walleye means less pressure on perch. What's not to like?
 
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