They put the pickerel in since the early 60's.i have caught several over the years.
I have two friends who swear they got it from a guy who was there at the lake at the time TWRA stocked some muskies in it a couple of winters ago. Said they were surplus stockers and had to go somewhere and were put in to help control the population of some of the other fish.
I have a hard time believing that it was done. Have never heard of anyone catching one. I doubt that they could survive in a shallow warm water lake.