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Table 3

Specific activities of fecal digestive enzymes in post-hatching green turtles when reared under different water depths (15 and 30 cm) and fed with commercial feed pellets (sinking or floating type).a The data (mean ± SEM) are for turtles sampled at the end of the experiment.

Parameter 15 cm 30 cm P-values of the factorsb



  Sinking pellet Floating pellet Sinking pellet Floating pellet Depth Pellet Depth × Pellet
Pepsin (mU mg protein−1) 13.44 ± 0.58 8.00 ± 1.96 12.30 ± 1.89 11.02 ± 2.95 0.655 0.137 0.335
Trypsin (mU mg protein−1) 211.59 ± 0.03 56.65 ± 3.78 172.07 ± 17.37 97.21 ± 14.17 0.969 <0.001 0.017
Chymotrypsin (mU mg protein−1) 24.46 ± 6.67 18.56 ± 3.47 19.50 ± 4.84 16.38 ± 3.90 0.503 0.380 0.869
Amylase (U mg protein−1) 1.48 ± 0.25 0.89 ± 0.01 1.66 ± 0.39 1.17 ± 0.09 0.467 0.052 0.708
Lipase (U mg protein−1) 0.78 ± 0.09 0.69 ± 0.30 0.90 ± 0.05 0.53 ± 0.01 0.899 0.175 0.384
a

Commercial floating or sinking feed pellets for marine carnivorous fish (Charoen Pokphand PCL., Samut Sakhon, Thailand).

b

Significant values are indicated by bold type (P < 0.05).

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