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Table 4 Activities of digestive and the metabolic enzymes (U/mg protein) in Catla catla fed with different concentration of Citrus sinensis-supplemented diets

From: Effect of dietary Citrus sinensis peel extract on growth performance, digestive enzyme activity, muscle biochemical composition, and metabolic enzyme status of the freshwater fish, Catla catla

Enzymes Citrus sinensis concentration g kg− 1
  Control 2.00 (diet 1) 6.00 (diet 2) 10 (diet 3)
Digestive enzymes (U/mg protein) Protease Initial 0.71 ± 0.22 0.71 ± 0.22 0.71 ± 0.22 0.71 ± 0.22
Final 1.11 ± 0.36c 1.69 ± 0.19bc 3.21 ± 0.65a 2.25 ± 0.48b
Amylase Initial 0.30 ± 0.03 0.30 ± 0.03 0.30 ± 0.03 0.30 ± 0.03
Final 0.58 ± 0.11c 1.15 ± 0.40bc 2.23 ± 0.55a 1.56 ± 0.27ab
Lipase Initial 0.28 ± 0.11 0.28 ± 0.11 0.28 ± 0.11 0.28 ± 0.11
Final 0.37 ± 0.06b 0.62 ± 0.10ab 1.15 ± 0.49a 0.76 ± 0.26ab
Metabolic enzymes (U/L) GOT Initial 9.05 ± 0.04 9.05 ± 0.04 9.05 ± 0.04 9.05 ± 0.04
Final 15.03 ± 0.89a 16.12 ± 2.75a 17.79 ± 2.64a 16.39 ± 1.06a
GPT Initial 6.64 ± 2.11 6.64 ± 2.11 6.64 ± 2.11 6.64 ± 2.11
Final 10.03 ± 0.94a 12.98 ± 1.18a 13.80 ± 3.32a 13.75 ± 2.41a
  1. Mean values within the same row sharing the same superscript are not significantly different (P ˃ 0.05), Citrus sinensis-free diet; n = 3 (three samples from each treatment), mean ± SD