This paper reports a method of measuring blood flow in the dorsal aorta of Octopus vulgaris using fixed magnet flow meters. Blood flow, like blood pressure, falls progressively during acute hypoxia. Flow increases greatly as soon as the ambient Poo2 rises, with values for a given external Poo2 exceeding those found during the preceding development of hypoxia. On average, about 70% of the total systemic blood flow runs down the aorta to the head and arms; the rest goes to the gonad, to the mantle, to the coronary circulation and to the guts. This pattern remains unchanged as the ambient POO2 falls.

This content is only available via PDF.