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James J. Nagler

James J. Nagler

Professor & Chair and Director, Center for Research on Invasive Species


Life Sciences South 252



Mailing Address

Dept. of Biological Sciences
University of Idaho
875 Perimeter MS 3051
Moscow, Idaho 83844-3051

Research: Cellular & Molecular Biology, Reproductive Biology

  • Ph.D. (1991) Memorial University of Newfoundland

The Nagler laboratory studies the effect of environmental factors, such as contaminants, photoperiod and diet on the reproductive biology of salmonid fishes.

My research training began with a BS degree, in Fish and Wildlife Biology, from the University of Guelph in 1983. This was followed with a MS degree from Concordia University in 1985, in which I investigated the sub-lethal reproductive toxicity of pentachlorophenol in female rainbow trout. I went on to study the physiology of ovarian development in a marine fish, the winter flounder, for my Ph.D. at Memorial University of Newfoundland in 1991. Subsequently, I worked as a research scientist on a variety of projects involving fish reproductive biology, in England and Canada, before joining the faculty at the University of Idaho.

  • Pierce AL, Medeiros LR, Hoffman B, Koch IJ, Narum SR, Galbreath PF, Nagler JJ (2021) Dietary tetradecylthioacetic acid supplementation during the fall prevents an increase in body lipid levels but does not influence precocious male maturation rate in juvenile spring Chinook salmon. Aquaculture Res.
  • Medeiros LR, Nagler JJ, Pierce AL (2020) Establishment of Time-Resolved Fluoroimmunoassays for Detection of Growth Hormone and Insulin-like Growth Factor I in Rainbow Trout Plasma. Comp. Biochem. Physiol. Part A 110751.
  • Jenkins LE, Pierce AL, Caudill CC, Graham N, Medeiros LR, Hatch DR, Nagler JJ (2020) Effects of physiological condition on aspects of repeat spawning in female Steelhead Trout reconditioned in captivity.  Trans. Am. Fish. Soc. 10.1002/tafs.10224.
  • Jenkins LE, Pierce AL, Graham N, Medeiros LR, Hatch DR, Nagler JJ (2019) Elevated plasma triglycerides and growth rate are early indicators of reproductive status in post-spawning female steelhead trout (Oncorhynchus mykiss) Conser. Physiol. 10.1093/conphys/coz038.
  • Jenkins LE, Pierce AL, Graham N, Branstetter R, Hatch DR, Nagler JJ (2018) Reproductive performance and energy balance in consecutive and repeat spawning female steelhead reconditioned in captivity. Trans. Am. Fish. Soc. 147: 959-971.
  • Medeiros LR, Galbreath PF, Knudsen CM, Stockton CA, Koch IJ, Bosch WJ, Narum SR, Nagler JJ, Pierce AL (2018) Plasma 11-ketotestosterone in individual age-1 spring Chinook salmon males accurately predicts age-2 maturation status. Trans. Am. Fish. Soc.147: 1042-1051.


Department of Biological Sciences

Physical Address:
Life Sciences South 252

Mailing Address:
875 Perimeter Drive MS 3051
Moscow, ID 83844-3051

Phone: 208-885-6280

Fax: 208-885-7905


Web: Department of Biological Sciences