Been reading about the how... depth/size/shape/slope etc.

Still wondering on the why?

For example, What is the advantage of raising separate and then catching and moving to larger pond to feed predators vs. just simply letting them live/spawn and be eaten in the larger pond without having to trap and move them?

I'm assuming that the forage might grow larger before being eaten if they grow in a separate pond, but I'm not biologist.

Has there been a PB article/back issue that deals with this question? I am a only a recent subscriber.

Please list any + or - you see to having a separate forage pond (given you have the space for one).