Blood pressure and heart rate during tonic immobility in the black tipped reef shark,Carcharhinus melanoptera |
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| Authors: | Peter S Davie Craig E Franklin Gordon C Grigg |
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| Institution: | (1) Heron Island Research Station, The University of Queensland, Heron Island, The Great Barrier Reef, Queensland, Australia;(2) Department of Physiology and Anatomy, Massey University, Palmerston North, New Zealand;(3) Present address: Gatty Marine Laboratory, University of St Andrews, St Andrews, Fife KY16 8LB, Scotland;(4) Department of Zoology, University of Queensland, Brisbane, Australia |
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| Abstract: | Tonic immobility was induced in black tipped reef sharks (Carcharhinus melanoptera) and heart rate and ventral aortic blood pressure recorded. Without branchial irrigation, tonic immobility was correlated
with a significant depression in blood pressure and heart rate irrespective of the sharks being in air or in water. Tonic
immobility with branchial irrigation resulted in a significant increase in blood pressure in sharks in air, but not in water.
Heart rate was unchanged when the gills were irrigated. Intra-arterial injections of atropine abolished the bradycardia and
blood pressure rise associated with tonic immobility. We conclude that, during tonic immobility, sharks are able to receive
afferent information from the ventilatory system and make appropriate responses via the vagus nerve. |
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| Keywords: | tonic immobility heart rate blood pressure black-tipped reef shark Carcharhinus melanoptera |
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