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Table 3.

The pH of test diets and fish digestive tract at 12 h post-prandial

pH of tissue adherent fluid
pH of luminal content
Test dietspH of dietStPCPISILIStPISILI
HCl (5%) 4.0 2.2a±0.4 7.7b±0.3 8.0b±0.0 8.1b±0.1 8.0b±0.0 2.0a±0.0 8.3b±0.2 8.6bab±0.1 8.6ba±0.1 
H2SO4 (3.5%) 3.5 1.8a±0.2 7.8b±0.2 8.0b±0.0 8.1b±0.1 8.2b±0.2 2.0a±0.0 8.0b±0.0 8.3ba±0.1 8.5ba±0.1 
H2SO4 (1%) 4.8 1.7a±0.2 8.1b±0.1 8.0b±0.0 8.3b±0.1 8.5b±0.1 1.7a±0.2 8.5b±0.0 8.7bab±0.1 8.8bab±0.0 
Acetic acid (5%) 4.7 1.8a±0.2 8.2b±0.1 8.0b±0.0 8.2b±0.2 8.6b±0.2 1.8a±0.2 8.2b±0.1 8.6bab±0.1 8.8bab±0.0 
No-acid (0%) 5.7 2.5a±0.5 8.2b±0.2 8.0b±0.0 8.3b±0.1 8.3b±0.1 2.3a±0.3 8.2b±0.1 8.6bab±0.2 8.7bab±0.1 
Antacid (5%) 6.0 2.0a±0.0 8.3b±0.0 8.0b±0.0 8.4b±0.1 8.5b±0.1 2.0a±0.0 8.3b±0.2 8.9bb±0.1 8.9bb±0.1 
pH of tissue adherent fluid
pH of luminal content
Test dietspH of dietStPCPISILIStPISILI
HCl (5%) 4.0 2.2a±0.4 7.7b±0.3 8.0b±0.0 8.1b±0.1 8.0b±0.0 2.0a±0.0 8.3b±0.2 8.6bab±0.1 8.6ba±0.1 
H2SO4 (3.5%) 3.5 1.8a±0.2 7.8b±0.2 8.0b±0.0 8.1b±0.1 8.2b±0.2 2.0a±0.0 8.0b±0.0 8.3ba±0.1 8.5ba±0.1 
H2SO4 (1%) 4.8 1.7a±0.2 8.1b±0.1 8.0b±0.0 8.3b±0.1 8.5b±0.1 1.7a±0.2 8.5b±0.0 8.7bab±0.1 8.8bab±0.0 
Acetic acid (5%) 4.7 1.8a±0.2 8.2b±0.1 8.0b±0.0 8.2b±0.2 8.6b±0.2 1.8a±0.2 8.2b±0.1 8.6bab±0.1 8.8bab±0.0 
No-acid (0%) 5.7 2.5a±0.5 8.2b±0.2 8.0b±0.0 8.3b±0.1 8.3b±0.1 2.3a±0.3 8.2b±0.1 8.6bab±0.2 8.7bab±0.1 
Antacid (5%) 6.0 2.0a±0.0 8.3b±0.0 8.0b±0.0 8.4b±0.1 8.5b±0.1 2.0a±0.0 8.3b±0.2 8.9bb±0.1 8.9bb±0.1 

St, stomach; PC, pyloric caeca; PI, pyloric small intestine; SI, small intestine; LI, large intestine. Each value represents the average of three fish (± s.e.m.). Values in rows with different small letters are significantly different (P<0.05). Values in columns with different capital letters are significantly different (P<0.05).

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