Estimation of the Optimum Dietary Protein to Lipid Ratio in Juvenile Pengze Crucian Carp (Carassius auratus Var. Pengze)

Table 4

Digestive enzyme activities of Pengze crucian carp (Carassius auratus var. Pengze) juveniles fed diets with different protein and lipid levels¹.

Diet no. (protein/lipid)	Trypsin activity (U/mg protein)	Amylase activity (U/mg protein)	Lipase activity (U/g protein)
Diet 1 (30/5)	^a	^c	^a
Diet 2 (30/8)	^ab	^bc	^b
Diet 3 (30/11)	^bc	^ab	^e
Diet 4 (35/5)	^c	^ab	^c
Diet 5 (35/8)	^bc	^ab	^de
Diet 6 (35/11)	^c	^ab	^f
Diet 7 (40/5)	^c	^ab	^c
Diet 8 (40/8)	^c	^ab	^c
Diet 9 (40/11)	^ab	^a	^c
Protein level (%)
30	^u	^v	^u
35	^v	^u	^v
40	^v	^u	^u
Lipid level (%)
5		^y	^x
8		^xy	^x
11		^x	^y
Two-way ANOVA ( value)
Protein	0.000	0.000	0.000
Lipid	0.844	0.001	0.000
	0.000	0.620	0.000

¹Data are expressed as (). Values in the same column with different superscripts are significantly different (). ^uvSignificant () difference between protein levels within the same lipid level. ^xySignificant () difference between lipid levels within the same protein level.