This study evaluated the effects of increasing stocking density under a fixed aeration capacity on water quality, growth performance, and economic efficiency of Nile tilapia ( Oreochromis niloticus ) cultured in concrete ponds equipped with a semi‐movable paddlewheel aeration configuration. Three stocking densities (80, 120, and 160 fish m −3 ) were tested over a 90‐day production cycle using a completely randomized design wit...