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Increased acute thermal tolerance and little change to hematology following acclimation to warm water in juvenile Striped Bass, Morone saxatilis

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Abstract

Striped Bass naturally inhabit a wide range of temperatures, yet little is known about the processes that control their acute and chronic temperature limits. The objective of this study was to determine the effect of temperature acclimation on acute thermal maxima and physiology of juvenile Striped Bass. Juvenile fish were acclimated to 15, 25 or 30 °C for 4 weeks, then split into two sampling groups: post-acclimation and post-critical thermal maximum trials. We found that fish survived in all acclimation temperatures with little change to underlying hematology, and that critical thermal maximum (CTmax) increased with increasing acclimation temperature. At CTmax, fish acclimated to 30 °C had elevated plasma cortisol, lactate and potassium levels. These results suggest that, while 30 °C is likely to be outside their thermal optima, Striped Bass can survive at high temperatures. This ability to cope with warm temperatures may provide an advantage with increasing global temperatures.

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Data from this manuscript will be archived on the University of New Brunswick’s Dataverse Research Data Repository.

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Acknowledgements

Funding for this project was provided by Natural Sciences and Engineering Research Council of Canada, Canada Research Chair, University of New Brunswick, New Brunswick Innovation Foundation, and the Canada Foundation for Innovation. The authors would like to thank Dr. J Duston at the Haley Institute at Dalhousie Faculty of Agriculture, Truro for the fish used in this manuscript. Also, Dr. J Keffer for useful insight in preparing this manuscript.

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Correspondence to F. M. Penny.

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All experiments were assessed and approved by the University of New Brunswick Saint John’s Animal Care Committee as directed by the Canadian Council of Animal Care (Protocols 2017-2 S-08, 2018-2R-01 and 2019-2R-05). 

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The authors are not aware of any conflicts of interest.

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Penny, F.M., Pavey, S.A. Increased acute thermal tolerance and little change to hematology following acclimation to warm water in juvenile Striped Bass, Morone saxatilis. Environ Biol Fish 104, 489–500 (2021). https://doi.org/10.1007/s10641-021-01088-6

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  • DOI: https://doi.org/10.1007/s10641-021-01088-6

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