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First published online May 1, 2006
Journal of Experimental Biology 209, 1883-1893 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02205

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Water dynamics in the digestive tract of the freshwater rainbow trout during the processing of a single meal

Carol Bucking^* and Chris M. Wood

McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4K1, Canada

View larger version (26K): [in a new window]   Fig. 1. Changes in plasma concentrations (mmol l–1) of various ions after feeding (immediately after 0 h) found in series 1. Values are means ± s.e.m. (N=7). *Significant difference from control (0 h) values.

View larger version (27K): [in a new window]   Fig. 2. Osmolality (mOsm) of the fluid phase extracted from the chyme after feeding (immediately following time 0) during series 2. Values are means ± s.e.m. (N=7). *Significant difference from initial values (defined by the first appearance within that GI tract section or 0 h values for plasma). Bars that share letters demonstrate no significant differences between GI tract sections within a time point. Plasma osmolality has been included as a reference (also found in Table 2).

View larger version (22K): [in a new window]   Fig. 3. (A) Changes in the proportion of beads found in each section after feeding (immediately following 0 h) when compared to total bead count along GI tract (%). Values are means ± s.e.m. (N=7, except at 96 h in the mid intestine, N=3). (B) Changes in the proportion of [3H]-PEG 4000 counts found in each section after feeding when compared to total counts along GI tract (%). Values are means ± s.e.m. (N=7, except 96 h in the mid intestine, N=3). *Significant difference from the proportion of beads in the corresponding section in A.

View larger version (24K): [in a new window]   Fig. 4. The relative concentration of solid matter along the GI tract (g dry mass bead–1) following feeding (occurred immediately following 0 h). Values are means ± s.e.m. (N=7). Bars that share letters demonstrate no significant differences between GI tract sections at a particular time point.

View larger version (27K): [in a new window]   Fig. 5. Water content found in the food and chyme (% total wet mass chyme) after feeding (immediately after 0 h). Values are means ± s.e.m. (N=7). *Significant difference from initial values (defined by the first appearance within that section); significant difference between food and stomach at 2 h. Bars that share letters demonstrate no significant differences between GI tract sections at a particular time point.

View larger version (26K): [in a new window]   Fig. 6. Changes in the relative concentration of water found in food and chyme (ml bead–1) after feeding (immediately following 0 h). Values are means ± s.e.m. (N=7). *Significant difference from initial values (defined by the first appearance within that section); significant difference between food and the stomach at 2 h. Bars that share letters demonstrate no significant differences between GI tract sections at a particular time point.

View larger version (20K): [in a new window]   Fig. 7. Estimated water fluxes within each GI tract section. See text for details. Values are means ± s.e.m. (N=7).