K.C. your welcome. This site really is the greatest thing.
There's a search function that you can click on on the upper right (?) section of the page. You can search those topics like "crappie" and something for a pond size calculation.
When you search, it's important to select the right sub-category of the forum. ie/ if you wanted to know about putting X-mas trees in your pond, you would do your search in the "Creating Habitat" sub-category.
Anyone's guess on your pond's size in acres is going to be very rough from just the pictures.
My pond is 6-7 acres, with depths from 15' to shallow. I have black crappie in my pond. They were there when I bought the pond (6) years back.
The biggest crappie I ever caught was maybe 8-9" long. They're not overpopulated, but on the other hand, they are nothing to write home about either (I had good size LMB, bluegill, bullheads in the pond). I think my LMB population kept them in check.
So I think with your 7 acres, you could manage for a great LMB fishery (or other predator species) or a great Crappie fishery, but maybe not both. Please note I said "maybe." If you are an active pond manager, who know's what is possible.
