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Drifting Away of a FET Endpoint: The Heart Rate in Danio rerio Embryos is Extremely Sensitive to Variation in Ambient Temperature

Abstract

Beyond the mere detection of presence or absence of heart beat in zebrafish (Danio rerio) embryos in a fish embryo test conducted referring to the OECD TG 236 at 48 hpf (hours post fertilization) onwards, embryo heart rate may serve as an additional and very sensitive endpoint in ecotoxicological studies. But by including heart rate as a sublethal endpoint, care has to be taken of separating effects exerted by a tested compound from those exerted by temperature. Therefore, profound knowledge on the natural variation of zebrafish heart rates at defined temperatures as a basis for the assessment of gained results is mandatorily needed. As such continuous information in D. rerio is lacking from the literature, we designed a study covering a span of 12°C (from 18 to 30°C in steps of 2°C) to quantify the relationship between heart rate and temperature in D. rerio embryos 48 hpf. Conducting a multiple regression analysis, we found a considerably strong relationship between treatment temperature and the log10 of the heart rate, ranging from 82.8 beats per minute at 18°C to 218.0 beats per minute at 30°C. Our results therefore may serve as a reference for heart rates measured under normal conditions to be able to detect potential effects of contaminants in other studies when working under certain temperatures.

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Acknowledgements

We thank C. Hepper, A. Meral, V. Baur, F. Gammerdinger and J. Leibßle for the maintenance of the D. rerio culture.

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Correspondence to Mona Schweizer.

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Schweizer, M., Dieterich, A., Triebskorn, R. et al. Drifting Away of a FET Endpoint: The Heart Rate in Danio rerio Embryos is Extremely Sensitive to Variation in Ambient Temperature. Bull Environ Contam Toxicol 99, 684–689 (2017). https://doi.org/10.1007/s00128-017-2196-1

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Keywords

  • Danio rerio
  • Fish embryo test (FET)
  • Heart rate
  • Temperature