On first attempt to reach Michigan Department of Natural Resources Fisheries Research Biologist David Fielder, he wasn’t monitoring fish populations or water quality. He was busy with a perch basket lunch.
The yellow perch is a staple of Great Lakes commercial and recreational fishing, and Friday fish fries.
Great Lakes Now
https://www.greatlakesnow.org/2021/07/yellow-perch-low-populations-wisconsin-michigan-fishing/