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Fig. 1. Pi concentrations of the luminal fluid (A) and pH of the adherent and
luminal fluid (B) from various sections of the alimentary canal in rainbow
trout consuming commercial feed pellets. GI, gastro-intestinal; St, stomach;
Pc, pyloric caeca; I-a, pyloric caeca region of the proximal intestine; I-b,
post pyloric caeca region of the proximal intestine; I-c, first 1/2 of the
distal intestine; I-d, second 1/2 of the distal intestine; Adherent, adherent
fluid; Luminal, luminal fluid. Each column represents the mean ±
S.E.M. (N=5 fish). Samples were collected 6 h
postprandial.