About 5 years ago, I loaded my little 1 acre neighborhood pond up with Gizzards. Huge bass were the product. To be honest, I didn't see any horrible results of such a move, we did put several flatheads in the pond from the MO river which seemed to have helped clear the shad a bit, LMB alone will not control them. I recently had a fish kill from city tap water being released into the pond. Quite a few Shad in the 6"-8" range washed up but not as many as I would have thought. That tap water came in for 4.5 hours so I'm pretty sure there isn't much left in the pond, currently debating what direction I want to go this time...I don't mind breaking "the rules"