Mine is a round 4' diameter by 4' deep. Frame built from 1/2" pex and enclosed w/ 3/4" nylon fencing. Minnows can easily swim in so the BG have feeding options. Free floating with pool noodle on the top rim and allowed to drift. I have it tied off on the dock.

I wouldn't have an issue keeping a couple dozen fish in it over an extended period.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!