The Requirement and Protective Effects of Dietary Protein against Chronic Ammonia Exposure in Juvenile Genetically Improved Farmed Tilapia (Oreochromis niloticus)

Table 6

Enzyme activities in liver and gill tissues of GIFT juveniles fed diets with different protein levels under low or high ammonia exposure for 8 weeks.

Ammonia (mg/L)	Protein level (%)	Liver			Gill
		SOD (U/mg)	CAT (U/mL)	GPx (U/mL)	Na^+/K^+-ATP (U/mg)
0.02 mg/L	31.04	^a	^d	^de	^b
0.88 mg/L	22.64	^a	^a	^a	^a
	27.26	^a	^a	^ab	^a
	31.04	^ab	^ab	^bc	^b
	35.63	^ab	^bc	^cd	^b
	38.47	^ab	^c	^d	^b
	42.66	^b	^c	^e	^b

Values are (standard deviation) of three replicate per treatment, values in the same row within the same protein level sharing different letters are significantly different at , as determined by Tukey’s test. SOD: superoxide dismutase; CAT: catalase; GPx: glutathione peroxidase.