Temperature effect on heart rate performance of eel (Anguila bicolor)

Abstract

Temperature changes affect fish behavior, and it is one of the critical factors which influence fish survival. The optimum temperature of a species can be used to detect the presence of fish. The fish heart rate indicates the effect of temperature on fish physiology. This study aims to determine the effect of temperature on the fish heart rate and its recovery time. The study collected the heart rate data by observing 40 eels (Anguila bicolor ) measuring 36±0.30 cm and body weight <200 g at 21, 25, and 31°C. The heart rate was monitored by the electrocardiograph (ECG) technique. The results from video monitoring were calculated using frame-by-frame video analysis. The effect of the temperature on the heart rate and recovery time were processed using statistical analysis with a completely randomized design. The results showed that the eel heart rates at 21, 25, and 31°C were 40±1.61, 70±3.91, and 122±7.36 bpm, respectively. Temperature significantly affected (P<0.05) the eel heart rate with the lower Q10 values were 2.77 and 2.25. The eel heart rate recovery time at low temperature was more prolonged than at high temperature.

Perspective Chapter: In Vitro Contracting Cardiomyogenic Models from Whole Fish Embryos and Larvae – Method, Properties, and Applications

“…The contraction frequency of the SCCs correlated highly with temperature [29]. A steady and significant increase in their frequency with increasing temperature and vice versa was observed [29], as found in the in vivo condition in fish and mammals [37][38][39].…”

“…This includes exploring the effects of temperature fluctuations and changes in oxygen levels on cardiac cells, allowing researchers to manipulate temperature and oxygen concentrations to simulate hypoxic or hyperoxic conditions to overall mimic different climate scenarios in vitro. In this way, the effects of temperature and oxygen changes on cardiomyocyte viability, contractility, electrical activity, and overall cardiac function can be assessed, allowing further investigation of the biological mechanisms underlying cardiomyocyte behavior under adverse environmental conditions [37][38][39][40][41][42][43][44]. Moreover, extensive research has demonstrated the influence of temperature on cardiac contractility across vertebrates [24,37,41,42].…”