Phil, I can't think of any reason not to rock (rip rap) the edges to create aeration. It will also add hiding places for small micro organisms and fish fry. For the rest, the bottom, I guess it depends on why you would want to provide a bunch of rocks. From a fish attractant standpoint, it can be overdone and actually wind up distributing fish.

Some say that you should provide no more than 20 to 25% structure. However, I believe that, if strategicaly placed prior to impoundment, you can go up to 40%. However, it should be planned like a fish highway and not just random.

A consideration might be size of pond and types of fish and other residents.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa