I am on a much smaller body of water than you are and much earlier in the process of growing my fish as well. I looked the world over for threadfin shad in Kansas and couldn't come up with a supplier. As a result, I substituted Tilapia for Threadfin on spring stocking and as the fish grow will likely do some research on Rainbow Trout for Fall.
Tilapia do not fall into the same niche in the pond as Threadfins but they are available in the KC area and there's info out there on using them as additional forage that will ultimately save some of the BG from predation thus bolstering the BG numbers in the fall after the Tilapia have died or been gorged on as they start to struggle in lower temps. Path of the RBT as I understand it is very similar to the Tilapia in the Spring as the water temps warm and they struggle LMB gorge on them as well.
Looks like you are going on 5yrs on the BoW. Have you had a survey done to see if there are recommendations or what the populations are looking like? There might need to be an update to the 20-25lbs per acre culling you are currently doing to take your fish to the next weight bracket.
1.5acre LMB, YP, BG, RES, GSH, Seasonal Tilapia I subscribe to Pond Boss Magazine
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