Abstract
1.1. Methods of telemetry of heart rate from fish in the natural environment are reviewed. Acoustic transmission is more widely used than radio.2.2. The ECG waveform can be analysed to define maximum heart rate, core temperature and breathing rate as well as heart rate.3.3. Missing heart beats or approach reflexes are observed in response to environmental stimuli.4.4. Heart rate often displays circadian cycles allowing analysis of physiological and behavioural rhythms.5.5. Methods of standardization of data in order to compare different fish at different temperatures are discussed.6.6. Heart rate can be used to place maximum values on estimates of metabolism in the wild.7.7. Heart rate telemetry allows investigation of environmental stress and mortality probability under different conditions.
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