Resumen El articulo expone un sistema automatico para controlar la temperatura y aumentar el oxigeno en estanques de cultivo de alevines de tilapia roja en la granja John Jairo Gonzalez, del Politecnico Colombiano Jaime Isaza Cadavid. El control se realiza a traves de un PLC que recibe dos senales de temperatura ubicadas en puntos diferentes del estanque, y una senal de un sensor de nivel. Ejecutando un algoritmo de control, activa o desactiva diferentes circuitos de Abstract This paper describes an automated system which controls the temperature and increases the oxygen, in the growing red tilapia fingerling’s tanks, at the Politecnico Colombiano Jaime Isaza Cadavid’s John Jairo Gonzalez Farm. The control operates through a PLC, which receives two temperature signals from the tank’s different parts, and another signal from a level sensor. The PLC runs a control algorithm, which enables or disables various cold water circuits, pumped from the Guaracu stream Ruben Dario Vasquez-Salazar - Adrian Camilo Pupo-Urrutia - Humberto Jose Jimenez-Aguas