AI Article Synopsis
- Synbranchus marmoratus is a fish capable of both gill ventilation and air-breathing, which leads to increased heart rate (tachycardia) when it surfaces.
- During this process, although the elevated heart rate may reduce stroke volume due to decreased cardiac filling time, the fish compensates through increased venous tone to maintain stroke volume.
- The study measured various cardiovascular parameters in different oxygen conditions, finding that both air-breathing and gill ventilation significantly influenced cardiac output and the venous system's regulatory role during these processes.
Article Abstract
Synbranchus marmoratus is a facultative air-breathing fish, which uses its buccal cavity as well as its gills for air-breathing. S. marmoratus shows a very pronounced tachycardia when it surfaces to air-breathe. An elevation of heart rate decreases cardiac filling time and therefore may cause a decline in stroke volume (V(S)), but this can be compensated for by an increase in venous tone to maintain stroke volume. Thus, the study on S. marmoratus was undertaken to investigate how stroke volume and venous function are affected during air-breathing. To this end we measured cardiac output (Q), heart rate (f(H)), central venous blood pressure (P(CV)), mean circulatory filling pressure (MCFP), and dorsal aortic blood pressures (P(DA)) in S. marmoratus. Measurements were performed in aerated water (P(O2)>130 mmHg), when the fish alternated between gill ventilation and prolonged periods of apnoeas, as well as during hypoxia (P(O2)
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http://dx.doi.org/10.1242/jeb.02459 DOI Listing Publication Analysis
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