My friend has a pond that is 5,000 gallons on the lower level ....idk exactly, but the surface area is probably 15-20 across, 2-3 feet deep, probably 2 for most with a hole for 3' or 2.5' if I had to guess. How many Channel catfish would you put in this pond? Forget all other factors......just think of how many would be ok in 5,000 gallons.