Cooperative Fish and Wildlife Research Units Program: Alaska
Education, Research and Technical Assistance for Managing Our Natural Resources

Alaska Project


Development and calibration of bioelectrical impedance analysis as a measure of energetic status of Arctic grayling (Thymallus arcticus)

August 2012 - July 2015


Personnel

Participating Agencies

  • Cooperative Research Units
Electrical measurements are taken on an Arctic grayling to estimate body condition

The energetic status of fishes represents energy stored as protein and lipids and reflects the ability of an individual to reproduce, migrate, and transition through life stages, ultimately influencing survival. However, traditional measurement methods, while highly accurate, are time consuming, expensive, and lethal, and nonlethal methods such as condition factor may not adequately characterize energetic status. Development of non-lethal but precise methods, such as biolelectrical impedance analysis (BIA), to estimate Arctic grayling body condition, as well as baseline data on variation in condition across populations in interior Alaska, is needed. This project was a collaboration between the University of Alaska Fairbanks and USGS. We found the BIA approach to provide rapid, precise, and non-lethal estimates of Arctic grayling body condition, and that fish condition varied by sex, season, and the presence of spawning Pacific salmon across interior Alaska river basins. Such an approach may be useful for future work to characterize Arctic grayling bioenergetics and monitor fish condition under a rapidly changing Arctic environment.

Research Publications Publication Date
Falke, J.A., Bailey, L.T., Fraley, K.M., Lunde, M.J., and A.D. Gryska. 2019. Energetic status and bioelectrical impedance modeling of Arctic grayling Thymallus arcticus in interior Alaska rivers. Environmental Biology of Fishes. https://doi.org/10.1007/s10641-019-00910-6 September 2019
Presentations Presentation Date
Bailey, L.T., and J.A. Falke. 2014. Development and calibration of bioelectric impedance analysis as a measure of energetic status of Arctic grayling (Thymallus arcticus). Alaska Chapter American Fisheries Society Annual Meeting, Juneau, Alaska, 21-24 October 2014. October 2014
Fraley, K. M., Lunde, M. J., Bailey, L. T., Falke, J. A., and A. D. Gryska. 2013. Bioelectrical impedance analysis as a measure of energy density in arctic grayling (Thymallus arcticus). Alaska Chapter American Fisheries Society Annual Meeting, Fairbanks, AK, 7-11 October 2013. October 2013