It does resemble a chain pickerel in a sense.. but I highly doubt thats what it is.. Thats fish would be a trophy class pickerel. The pattern on that fish is just as far off for a chain pickerel as it is for a northern. Its very common to get young northerns with similar markings, but I dont think I have ever seen one of that size with the unusual markings.
Polk county WI. Caught a muskie that night and quite a few this year on the same lake. All of theme have been just your average olive green. Have not caught any tigers out there that I can recall.