bowjo...I caution anyone calling me and wanting to use tilapia for watermeal and duckweed control. Tilapia can help gain control, but rarely in a predator pond, and WM/DW may be two things that are more prolific than tilapia...lol...the tilapia would become food while browsing and being vulnerable to attack.
From what I have read, you can have a tilapia pond with duckweed as the food source and you can really REALLY reduce the amount of feed you have to throw to grow some quality tilapia. This ofcourse is with no predators as you said. I just thought it was a cool idea for people looking to grow food for the table.
