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1. Cardiac activities of male and female spawning chum salmon were recorded simultaneously by using a radio telemetry system in combination with a wired system. 2. Heart beat stopped during a spawning bout for about 10 sec in female and for 4-6 sec in male. 3. Just before and after the temporary cardiac arrest, heart rate increased from the usual rate, about 50 to about 60 beats per min. 4. It is suggested that the cessation of heart beat might be a reflex response of the cardiovascular system to the hypertension at spawning.
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