I know this pond, as I fish a few of these up here myself.
Are they on bottom or roaming?,.. Both, depending on conditions, with suspended added in there for giggles.
These fish are bass, just the same as bass found on definitive structure/cover. They just have a different set of options available. Recognizing the cues and clues, or "ever so slight" changes, will answer your questions.
Match their forage correctly, fish where they are, at the right time.
As many will attest to, right bait, right place, right time.
These shallow clear water mudholes are a task, I will attest that it seems the fish have been beamed aboard the starship Enterprise for the spring months, or have left for Florida over the winter like the geese, and retiree's, and have yet to return. But trust me, they are there, and as you move around the pond, casting away at the usual targets, the fish are usually right beneath your mode of floatation, hugging the bottom, feeding voraciously on something, be it baitfish, crayfish, insects,.. whatever.
These ponds?,. this time of year??? Tough deal, but not impossible. "Follow the yellow brick road",... consider ALL of the variables to piece the puzzle together. And that right there?? is the key