Journal
JOURNAL OF FISH BIOLOGY
Volume 57, Issue 1, Pages 197-209Publisher
ACADEMIC PRESS LTD
DOI: 10.1111/j.1095-8649.2000.tb00786.x
Keywords
Salmonidae; teleost; fish; exercise; wireless monitoring; non-invasive techniques
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Resting heart rates and ventilation rates in rainbow trout Oncorhynchus mykiss at 15 degrees C are 31.8 +/- 1.8 beat min(-1) and 53.1 +/- 3.7 breaths min(-1), respectively. The non-invasive recording system picked up the bioelectric potentials generated by the fish in the water and was based on an array of six silver-silver chloride electrodes covered with agar-gel, which provided a better signal-to-noise ratio than in previously described systems, and allowed the determination of heart rate and ventilation rates at different swimming speeds up to 21 s(-1). In concert with the lower rates, the scope for changes in heart rate and ventilation rate during swimming was also considerably larger than in earlier studies (2.4- and 2.0-fold, respectively). Two main conclusions result from this work: (i) short recovery times under 48 h after anaesthesia and surgery are unlikely to provide truly resting heart rates and ventilation rates in trout at 15 degrees C; (ii) heart rate regulation during exercise is more important than previously thought and might account for a larger proportion of the increase in cardiac output observed in swimming trout. (C) 2000 The Fisheries Society of the British Isles.
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