There is a cattle feed lot near me that I am told stocked tilapia in a catch pond. That is the downhill pond that all of the cattle waste runs to. I am told that the tilapia kept the pond clean. Once a year the pond is drained and the tilapia ground up for fertilizer or something. I have no personal knowledge of this but it sounds plausible. Not sure I'd want to eat the fish, though.
Curious about a couple of things. How do tilapia eat? Do they filter water or actually take bites of algae or both? Is there any downside to them? I would assume that the amount of manure they produce would foul the water but beign filter feeders maybe they can clean up after themselves.
