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Printed in Great Britain CARDIAC OUTPUT IN THE LARGE CEPHALOPOD OCTOPUS DOFLEINI*

By Kjell Johansen

Abstract

The high level of structural organization displayed by the cardiovascular system of cephalopoda promises a similar complexity in its functional organization. In spite of an extensive literature on this subject most of the work is old and inadequate in techniques and experimental procedures (Fuchs, 1895; Fredericq, 1914)- The only physiological parameters hitherto recorded of any value for the evaluation of cardiovascular dynamics have been arterial and venous blood pressures (Johansen & Martin, 1962). The present paper attempts to describe measurements of the cardiac output making use of the Fick principle. Simultaneous measurements of blood pressure and analyses of blood gases provide data for calculation of stroke volume and stroke work as well as oxygen saturation of arterial and venous blood. MATERIALS, METHODS AND EXPERIMENTAL PROCEDURES The species used for the experiments was Octopus dofleini. The species is one of the larger living cephalopods reaching weights up to 50 kg. It is distributed along the Asian coast, extending over to the Gulf of Alaska and down the Pacific coast of Nort

Year: 1964
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