PMID: 9320017Jan 1, 1996

Consequences of catecholamine release on ventilation and blood oxygen transport during hypoxia and hypercapnia in an elasmobranch Squalus acanthias and a teleost Oncorhynchus mykiss

The Journal of Experimental Biology
S F Perry, K M Gilmour


The marine dogfish (Squalus acanthias) and the seawater-adapted rainbow trout (Oncorhynchus mykiss) were exposed to acute environmental hypercapnia or hypoxia to evaluate (i) the dynamics of catecholamine release into the circulation and (ii) the impact of catecholamine release on gill ventilation and blood oxygen transport. This comparison was undertaken to test the hypothesis that the pattern and consequences of catecholamine release differ in the two species according to the presence or absence of a Root effect and a red blood cell (rbc) ss-adrenergic response. Hypercapnia and hypoxia elicited marked increases in plasma catecholamine levels in the trout but not in the dogfish. In the trout, catecholamine release occurred abruptly during hypoxia when arterial PO2 (PaO2) decreased below 2.7 kPa. In the dogfish, plasma catecholamine levels remained stable during hypoxia even when PaO2 fell below 2.0 kPa. Trout and dogfish displayed pronounced hyperventilatory responses during both hypercapnia and hypoxia. In trout, the hyperventilatory response consisted of an increase in ventilation amplitude (estimated by opercular cavity pressure changes) with no change in ventilation frequency (fv), whereas in the dogfish, both amplitude (e...Continue Reading

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