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Effects of rearing temperature on volitional and escape response swimming performance in lake sturgeon, Acipenser fulvescens, from hatch to age 1

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Abstract

In fishes, differences in early rearing environment can have a significant impact on phenotypic development. In the present study, we examined the effect of differences in egg incubation (adhered to substrate or non-adhered and tumbled) and water temperature during early rearing on the development of escape response and volitional swimming performance in lake sturgeon, Acipenser fulvescens, throughout the first year of life. Developing embryos were incubated at 12–14 °C and supplied with flow-through aquarium water and ambient light conditions in McDonald hatching jars or allowed to adhere to substrate. Upon hatch (~ 9 days post-fertilisation, dpf), larvae from each incubation treatment were then acclimated to 16, 18 or 20 °C at a rate of 0.5 °C·day−1 and held at those temperatures until approximately 33 dpf. All treatments were then transferred to a common garden experiment where tanks were fed flow-through river water at ambient temperature and natural light cycles. Sturgeon were fed ad libitum twice daily throughout the growing season and food was withheld when water temperature reached 1.5 °C (~ 6 months post-hatch). Food was reintroduced at the start of spring the following year when water temperature exceeded 2 °C (~ 10.5 months post-hatch). There was no consistent effect of treatment on either volitional swimming or escape responses suggesting significant phenotypic plasticity in these measured traits during the first year of life. There was however an effect of time on these performance metrics that was most likely the result of seasonal differences in temperature throughout the 13-month study.

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Data availability

Data available on request from the authors.

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All statistical analyses were conducted in Rstudio using publicly available packages.

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Acknowledgements

The authors thank the staff at the Grand Rapids Fish Hatchery for their help with caring for the sturgeon in this yearlong study. We also thank Forrest Bjornson, Amber Hiebert and Thomas Roberts for assistance in running experiments at the hatchery.

Funding

This research was supported by a NSERC/Manitoba Hydro Industrial Research Chair program in conservation aquaculture of lake sturgeon and NSERC Discovery grant #05348–15 awarded to WGA. CB was supported by an NSERC Canadian Graduate Student—Master’s Program award, a University of Manitoba Faculty of Graduate Studies’ Fellowship for Educational Purposes Award, Tri-council Supplement Award and Tri-council Top-up award, a University of Manitoba Department of Biological Sciences’ G.A. Lubinsky Award, and a Fish Futures Inc.’s Ken Stewart Memorial Scholarship; WB was supported by a University of Manitoba Graduate Fellowship Award.

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Correspondence to Catherine Brandt.

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Ethics approval

All described procedures and experiments were approved by the University of Manitoba’s animal care committee (protocol#: F015-007) pursuant to the guidelines established by the Canadian Council for Animal Care.

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The authors declare no competing interests.

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Appendix 1

Appendix 1

Table 1

Table 1 Statistical analysis carried out for each group of data tested that returned significant results. Includes the test statistic, sample sizes and p-values (when p < 0.05) associated with each statistical test

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Brandt, C., Bugg, W., Groening, L. et al. Effects of rearing temperature on volitional and escape response swimming performance in lake sturgeon, Acipenser fulvescens, from hatch to age 1. Environ Biol Fish 104, 737–750 (2021). https://doi.org/10.1007/s10641-021-01112-9

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  • DOI: https://doi.org/10.1007/s10641-021-01112-9

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