Linear programming is used to select systems based on minimization of total annual cost using aeration devices for pond to give optimum oxygen. By linear programming model results, one aerator of the type air-injector (0.75 kW) was found suitable for a pond of sizes 0.1, 0.2, and 0.4 ha by least-cost. Splash aerator (0.75 kW) was found suitable for single use for pond of sizes 0.8 ha by least-cost, and suitable in addition to diesel paddlewheel (9 kW) for large pond size (3.2 ha). Diesel paddlewheel aerators (6 kW and 9 kW) were found suitable for large pond sizes (1.6, 3.2, 4.0, and 4.8 ha). Diesel paddlewheel aerators are suitable for large ponds under Egyptian conditions.