You need to get larger Tilapia than predators usually feed on. Last 2 years, I have put in 5-8" Tilapia with the majority(70%+) making it to the winter die-off. Use the same philosophy as if you were adding BG or HSB to an existing pond.
Good luck
20 acres of trees & 3/4 acre pond.
"Home of the future Texas state HSB record for Private ponds"