this paper is based on the construction of an instrumentation system for the measurement of the most representative physical - chemical variables in fish farming in artificial ponds conditionals. The system has a temperature sensor LM35; also it has a commercial sensor for measurement of PH and dissolved oxygen. The control module is based on microcontroller ATmega8 of Atmel which its main task is reading all the information from the sensors. The system has an analysis stage written in C code in C++ Builder software to save and latterly to make the analysis by the user through reports in a text file of format .txt. And the end of the paper the results are presented of several measurements performed in an artificial pond in room temperature.