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We took juveniles into the lab that MN DNR collected and sent to me (via the good folks at the aquarium in Mall of America). We could not use adults because of the size constraints in the lab. But we did document the temperature-feeding patterns and resting metabolism of the fish across a broad range of temperatures. The results are pretty solid evidence that winter fishing would predominantly be a snagging affair-as the fish stopped feeding altogether in the 40s and rarely ate in the 50s. I believe DNR has verified the snagging with their own ‘angling’ at the wintering concentrations.
I have attached another published write-up that documents the migration patterns of flatheads (adults) in Missouri. The bottom line is that the fisheries were connected by migrating individuals. Fish captured in the big rivers may well have been in a tributary earlier in the year, and vice versa. The drivers of the migrations seemed to be the position of overwintering and reproductive habitats.
Hope the attachments are helpful to you. Happy Holiday season!
Jason Vokoun
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Dear WIDNR
The biologist facts are here. There are videos to show it.
It’s time WI stops digging in it’s heels and starts to protect a valuable resource they and MN share on the Mississippi and St Croix Rivers!