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Journal of Fish Biology (1998) 52, 11541164 Cardiac conduction times in Sparus auratus at different

Summary: Journal of Fish Biology (1998) 52, 11541164
Cardiac conduction times in Sparus auratus at different
heart rates. Influence of body weight
Unitat de Fisiologia Animal, Departament de Biologia Cellular i Fisiologia, Universitat
Auto`noma de Barcelona, E-08193 Cerdanyola, Spain
(Received 15 March 1997, Accepted 23 January 1998)
At different heart rates, the conduction time through the atrium of gilthead sea bream Sparus
auratus (PR interval) was constant in each fish but differed from one fish to another. This
difference was not related to the body size of the animal, suggesting the lack of preferential
conduction pathways in the atrium. A clear relation between RT interval and fish weight was
observed, suggesting a similar conduction speed of the excitatory wave and the presence of
specialized conductive tissue in the ventricle. Moreover, the PR and RT intervals did not
participate in the determination of the heart rate, and all changes in the heart rate were related
to changes in the TP interval. 1998 The Fisheries Society of the British Isles
Key words: Sparus auratus; electrocardiogram; heart rate; PR interval; RT interval.
The electrocardiogram (ECG) is considered a simple and useful way to examine
the physiological status of the heart in fishes. It has been used to investigate the
effect of different pathologies such as cardiac abnormalities due to different toxic


Source: Altimiras, Jordi - Department of Biology, Linkpings Universitet


Collections: Environmental Sciences and Ecology