I put 50 lbs fo tilapia into Zephyr Pond which is two acres. The pond has really gone down a bunch, but the tilapia are doing well and I seem to have tons of small BG. I think maybe the tilapia have taken the pressure off my BG and allowed them to prosper. I am anxious to start cathching bass again to see if they have increased in size. My wife loves having those tilapia, therefore we will always try to have them in Zephyr Pond