For those who like chowder, those big fish make perfect meat chunks for walleye chowder. In fact, anything about 25" or bigger are usually just called "chowder fish" and we keep the filets separate and vacuum seal in 2# batches (amount I use in recipe). The meat definitely is more dense and sometimes rubbery but is perfect for the chowder cooking process.
The smaller pieces from the tail end of the zipper (any size fish) I also separate. These go into 12-14oz packs labeled as "taco" packs. We frequently do fish tacos through the winter, it doesn't matter that those little filet pieces fall apart in the pan when they are being used as taco filling or salad topping anyway. Gordon's Food has approx 1qt sized containers of taco seasoning in their spice area. This is perfect for making odd sized batches of taco meats and no extra cost of buying the taco kits.
And to add to the debate... our boat has a 30 gallon box under the floor, we plumbed it as a live well but actually use it as a bleeding tank. Get fish out of net, cut gill feathers with kitchen shears, drop fish into tank and let it swim till it bleeds out. Then put them on ice. Exchange water every 4 to 6 fish.