Abstract: The paper discripes the application of determination of FRF-1 (fish respiration frequencies) in enviromental monitoring.And introduces the function of FRF-l instrument, sensor and structure of hardware and soltware of signle component computer system.
Nine species of fish are determined by the instrument, the results show that if the tetnpreture rises or drops 2~3℃, pH is less thn 7, turbidity rises above 25ppm and DO becomes low.All these will affect the fish respiration frequencies and the FRF-l varies with the change of fish respiration frequencies.