Abstract
Plasma catecholamines were measured following surgery under anaesthesia and after exposing hagfish to 90 and 110% sea water (SW). Plasma noradrenaline (NA) concentration increased from a resting value of 7 to 818 nM l−1 on anaesthesia. Plasma adrenaline (AD) did not change. NA concentrations also increased during volume depletion (110% SW), but to much lower values (26 nM l−1 at 100 min). AD concentrations were increased at 20 min, then fell. During volume loading (90% SW) NA fell, and AD increased to a maximum concentration of 511 nM l−1 at 40 min (resting concentration 24 nM l−1). The data are consistent with a vasoconstrictory role for NA on central veins when venous pressures fall and a vasodilatory role for AD on volume expansion.
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Abbreviations
- DA:
-
Dorsal aorta
- HR:
-
Heart rate
- PCV:
-
Posterior cardinal vein
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Experiments were approved by the University of Canterbury’s Animal Ethics Committee and comply with the laws of New Zealand. We thank two anonymous reviewers for their assistance in improving the manuscript.
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Communicated by I.D. Hume
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Foster, J.M., Forster, M.E. Changes in plasma catecholamine concentration during salinity manipulation and anaesthesia in the hagfish Eptatretus cirrhatus . J Comp Physiol B 177, 41–47 (2007). https://doi.org/10.1007/s00360-006-0107-6
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DOI: https://doi.org/10.1007/s00360-006-0107-6