Who knows what gets into where by accident or release by a fisherman. Looks like a small muskie to me. Where I grew up in St. Louis, there was a little lake (really a concrete hole) in St. Ferdinand Park that had a few 5 lb largemouths, 60-80 lb flatheads and blues, and numerous decent crappie. All released by anglers from LOZ and Truman that I guess wanted to see if they'd live or didn't want to clean the fish upon getting home.