Blood chemistry and acid-base balance in rainbow trout Oncorhynchus mykiss with experimentally-induced acute bacterial gill disease |
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| Authors: | P J Byrne V E Ostland J S Lumsden D D MacPhee H W Ferguson |
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| Institution: | (1) Fish Pathology Laboratory, Department of Pathology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada, N1G 2W1;(2) Present address: Shur-Gain/Maple Leaf Foods, 1 Salar Court, P.O. Box 279, St. George, New Brunswick, E0G 2Y0 |
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| Abstract: | Rainbow trout were experimentally infected with the causative agent of bacterial gill disease (BGD) (Flavobacterium branchiophilum) via bath challenge. All fish were cannulated with dorsal aortic catheters, had nasogastric tubes sutured in place for feeding, and were maintained individually, in plexiglass boxes with a flow-through water system. Fish were either fed, or unfed during the trial. Acute changes in blood gas, serum biochemistry and clinical parameters were monitored. By 24h post-challenge, BGD-infected trout that had been fed had significant hypoxemia, hypercapnia, increased blood ammonia, hypoosmolality, hyponatremia, hypochloremia, and increased cough and respiratory rates when compared to control levels. Unfed BGD-infected trout had similar, but less severe blood gas and clinical changes, and no electrolyte disturbances. The BGD-induced hypoxemia is likely exacerbated by increased oxygen demands brought on by feeding. It is not known what association feeding has with the development of low serum ion levels in BGD-infected trout. This is the first study to report the use of fed fish, as opposed to unfed or starved trout, in obtaining blood chemistry values from indisturbed and cannulated animals. |
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| Keywords: | infectious bacterial teleost trout gill acid-base respiratory distress hypoxemia electrolytes mucosal |
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