Patrick Walsh


Patrick Walsh
Adjunct Professor

Office: 613-562-5800 ext. 6328
Work E-mail:

Patrick WALSH


Research focuses on how organisms (primarily fish) adapt their physiology, biochemistry and molecular biology to the environment. The emphasis is on nitrogen metabolism and excretion, particularly on the phenomenon of urea excretion by fish (e.g., toadfish and sharks). This program seeks to understand why fish sometimes produce urea (instead of ammonia) from an ecological and evolutionary perspective, and to understand the molecular mechanisms enabling shifts from ammonia to urea production and excretion. Studies of gene expression using Micro arrays will feature more prominently in the future.

Selected publications:
  • Walsh, P.J., S.L. Smith, L.E. Fleming, H. Solo-Gabriele, W.H. Gerwick (Eds.). Oceans and Human Health: Risks and Remedies from the Sea. Academic Press, Amsterdam, xxiii & 644 pages, 2008
  • Wood, C.M., M.D. McDonald, L. Sundin, P. Laurent, P.J. Walsh. Pulsatile urea excretion in the gulf toadfish: mechanisms and control. Comp. Biochem. Physiol. 136B: 667-684, 2003
  • Matey, V., C.M. Wood, W. Dowd, D. Kültz, P.J. Walsh. Morphology of the rectal gland of the spiny dogfish (Squalus acanthias) shark in response to feeding. Can. J. Zool. 87: 440-452, 2009
  • Weihrauch, D., M.O. Wilkie, P.J. Walsh. Ammonia and urea transporters in gills of fish and aquatic crustaceans. J. Exp. Biol. 212: 1716-1730, 2009
  • Wilson, R.W., F.J. Millero, J.R. Taylor, P.J. Walsh, V. Christensen, S. Jennings, M. Grosell. Contribution of fish to the marine inorganic carbon cycle. Science 323: 359-362, 2009

Fields of Interest

  • Fish
  • Nitrogen metabolism
  • Urea
  • Ammonia
  • Stress
  • Micro arrays
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