RAH, I have rip rap all the way around and down quite a ways. Even at that, it's still highly unlikely they would ever pull off even a partial spawn. I think it would take a well planned and built channel with a continuous current flow of super clean water through that channel for it to have a chance at any regularity in a pond setting.
Walleye eggs are super sensitive to sediment and easily suffocate, in fact in the best situations I believe a high percentage of eggs in the areas where there is recruitment-do not hatch.
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