The invention relates to a sound generator for 
trapping mandarin fishes. The fish-
trapping sound generator comprises a 
transformer, a 
capacitor and triodes, wherein output ends of an oscillating coil of the 
transformer are connected with the 
capacitor in series, a center shaft head of a control coil of the 
transformer is connected with a power supply 
cathode and emitting electrodes of the triodes through a 
resistor, and the other two ends of the control coil are respectively connected with the bas electrodes of the triodes through a 
diode; and a center shaft head of a power coil of the transformer is connected with a power supply 
anode through a shunt 
resistor and a switch of an 
ampere meter, one end of the power coil is connected with the collector 
electrode of one 
triode, the other end of the power coil is connected with the collector 
electrode of the other 
triode and then is grounded, the input end of the power supply is connected with a 
voltmeter in parallel, and the shunt 
resistor is connected with the 
ampere meter in parallel. The fish-
trapping sound generator has simple structure, small size and convenience in use, the shock 
waves of the sound generator are in 
resonance with the sleep frequency of the mandarin fishes so that the mandarin fishes can be trapped during sleeping. The sound generator has no influence on the 
life habit of the mandarin fishes, and labor intensity for trapping the fishes is low.