The difference is that without stocking, stripers would be completely gone from Cland in a few years, walleye would not as they do spawn successfully and the stockings are supplimental. What would a walleye hybrid do?? I don't know. Maybe a good thing, but I don't know. The geneticists say that the rockcastle fish is an isolated population and that the strain is pure. I'll have to take their word for it. However, I would describe that egg source as anything but "easy".