If they take over the pond, I'll put in some walleye to clean things up (and hope for the best). I just took another 50 fish out from below the exit tube. All appeared to be BG or too small for me to tell. The tube has a 6 foot drop over 60 feet and then a one foot rise from an Agridrain flash-board device at the pond. Fast water and then a jump for any fish to navigate. I have also heard that gizzard shad do not tolerate low DO very well, so another winter like the last should take its toll. I did not see any shad-looking fish dead after last winter's kill, so maybe I am OK. I put all of the rescued fish is a very shallow pond that the creek floods into every few years, so I cannot really control what gets into it. It is at max 5' deep but is full of nice warmouth's, BG, and a couple nice LMB. I'll lose them sometime due to the shallow water, but its fun to fish right now.