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First published online December 1, 2006
Journal of Experimental Biology 209, 4885-4894 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02597

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Postprandial changes in plasma free amino acid levels obtained simultaneously from the hepatic portal vein and the dorsal aorta in rainbow trout (Oncorhynchus mykiss)

Anders Karlsson^1,2, Erika J. Eliason³, Liv Torunn Mydland¹, Anthony P. Farrell³ and Anders Kiessling^1,2,*

¹ Aquaculture Protein Centre (APC), Centre of Excellence, Norwegian University of Life Sciences, PO Box 5003, N-1432 Aas, Norway
² Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, PO Box 5003, N-1432 Aas, Norway
³ Department of Zoology and Faculty of Land and Food Systems, University of British Columbia, BC, Vancouver, V6T 1Z4, Canada

View larger version (12K): [in this window] [in a new window]   Fig. 1. Total free amino acid (AA) levels in blood plasma (nmol ml-1; means ± s.e.m.) collected synchronically from the hepatic portal vein (HPV; black squares) and dorsal aorta (DA; white squares) in free-swimming rainbow trout after a single meal. *Statistically significant difference (P<0.05, **P<0.01, ***P<0.0001) between the DA and HPV values at a given sample time. Values from the same vessel followed by the same letter do not differ significantly (P>0.05).

View larger version (13K): [in this window] [in a new window]   Fig. 2. Free amino acid (AA) levels in blood plasma (% of 0 h samples; means ± s.e.m.) collected synchronically from the hepatic portal vein (HPV; black squares) and dorsal aorta (DA; white squares) in free-swimming rainbow trout after a single meal. The major AA uptake patterns are represented by the sum of taurine, glutamic acid, glutamine, glycine, alanine, lysine, arginine and serine (type I; A), the sum of valine, cysteine, methionine, isoleucine, leucine, tyrosine and phenylalanine (type II; B) and the sum of threonine and tryptophan (type III; C). *Statistically significant difference (*P<0.05, **P<0.01, ***P<0.001) between the DA and HPV values at a given sample time. Values from the same vessel followed by the same letter do not differ significantly (P>0.05).

View larger version (16K): [in this window] [in a new window]   Fig. 3. Postprandial concentrations (nmol ml-1; mean ± s.e.m.) of ammonia and urea in blood plasma collected synchronically from the hepatic portal vein (HVP) and dorsal aorta (DA) in free-swimming rainbow trout after a single meal [ammonia in HPV (black squares), ammonia in DA (white squares), urea in HVP (black triangles) and urea in DA (white triangles)]. *Statistically significant difference (P<0.05, **P<0.01, ***P<0.001) between the DA and HPV values at a given sample time for either ammonia or urea. Values from the same vessel followed by the same letter do not differ significantly (P>0.05).