Effect of temperature on the swimming endurance and post-exercise recovery of jack mackerel Trachurus japonicus as determined by ECG monitoring
Nofrizal, Tokyo Univ. of Marine Science and Technology (Japan) | Yanase, K. | Arimoto, T.
The effect of temperature on the swimming performance of jack mackerel Trachurus japonicus was examined in a flume tank by measuring the swimming endurance time and heart rate. The lower swimming performance was observed at 10degC (the lowest temperature tested), manifesting as the shortest endurance time and the slowest maximum sustained speed. ECG measurements of the heart rate under free-swimming conditions at zero flow velocity revealed a temperature effect, with 25.3 beats/min observed at 10degC, 38.9 at 15degC, and 67.2 at 22degC. The heart rate also increased with swimming speed to maximum levels of 60, 125, and 208 beats/min, respectively, at these three temperatures. Heart rate recovery times measured after the fish had been swimming at prolonged speed tended to increase with temperature, while a negative correlation resulting in relatively short recovery times was observed after swimming at close to the burst swimming speed at each water temperature.
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