I believe thats true. You can not cook your daily catch while on the ice. I just have known about it ,not actually read anything about it. I'll try to call a C.O. to get a ruling today.
Here it is..... If there is a slot limit you can not clean the fish that need to be measured. Like on Mille Lacs ,however you could eat the perch as long as you still count those eaten as part of your daily limit.