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Author Topic: Sea Grant Lake Michigan-Huron Food habits study...  (Read 486 times)

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Dire Wolf

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Sea Grant Lake Michigan-Huron Food habits study...
« on: July 19, 2017, 10:17:04 AM »

Huron-Michigan diet study: What are fish eating?

As invasive species shift the Great Lakes food web, predators are changing their feeding habits. The Huron-Michigan Diet Study enlists anglers to contribute stomachs from all types of predatory fish caught in Lake Huron and Lake Michigan.

If you fish early or late in the year, late at night, or in places away from crowds, your contribution may be especially useful. To avoid bias, it is important that you collect stomachs from all fish caught during the trip. Even empty stomachs are very important because a high percentage of empty stomachs means that fish are having trouble finding food. If you decide not to collect fish stomachs after a trip, that is fine, but if you collect one stomach, you should collect all of them by doing the following:
•Cut the esophagus and intestine to remove stomach.
•Place stomach and all contents into plastic freezer bag.
•Write all required data on a data tag.
•Place the tag into the bag with the corresponding stomach.
•Seal the bag carefully to prevent spilling.
•Place the bag in one of the freezers located at access sites in Michigan and Wisconsin.

Freezers at collection sites are operated in conjunction with Michigan DNR and Wisconsin DNR, and volunteers from Michigan Steelheaders will be maintaining stomach collection supplies at many Michigan ports. Other partner groups include Michigan State University and U.S. Geological Survey.

Materials for stomach collection include:
•Stomach Sample Removal Figure (both lakes)
•2017 Lake Huron Diet Study Instructions
•Lake Huron Data Tags
•Lake Huron Stomach Drop Sites
•2017 Lake Michigan Diet Study Instructions
•Lake Michigan Data Tags
•Lake Michigan Stomach Drop Sites (TBD)

I can't cut and paste this and keep the bullet point links active.  Go to Michigan Sea Grant's website. Find the tab on the tool bar titled:Explore and open it. Scroll down to the Fisheries links and then scroll to the section I posted above to get tags, and turn-in sites if you intend to participate.

Contact Ron Kinnunen- (906) 226-3687  Be  patient, Ron is running back-and-forth to Vietnam per the "Rumpster Administration's" intervention in attempting to protect the domestic catfish market for Swai imports!


Dire Wolf

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Re: Sea Grant Lake Michigan-Huron Food habits study...
« Reply #1 on: July 19, 2017, 05:02:05 PM »

Chuck Madenjian is one of the USFWS people who  advocates that lake trout should be the keystone predator, principally because they feed at many different trophic levels on a broader variety of prey.  As you read this, I would encourage you to think in terms of annual fishery return for sport anglers or the life time fishery return, since lake trout live well into the twenties, while salmon are mature and out of the the system by 4.5 years.


Get ready, the MDNR is now discussing a Zone management approach to the Lake Michigan fishery, apparently, contradictory to the Coded Wire Tag data salmonines don't move throughout the basin, as well as between Lakes Michigan and Huron.