Abstract
Abstract Cardio-respiratory synchrony in which the heart tended to beat during adduction occurred in some Port Jackson sharks Heterodontus portusjacksoni during “eupnoea”. Bradycardia was evident in the apnoea and waning phase of arrhythmic respiration: a tachycardia accompanied the vigorous post-apnoeic ventilation. Cardio-respiratory relationships appeared only in quietly resting, undisturbed fish.
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