Figure 2: Lysozyme activity in plasma. The lysozyme activity in fish plasma was expressed as percentage change over 4 minutes in fish fed with different concentration of β-glucan. The X-axis represents days of feeding. 1 unit = (OD 1 min – OD 5 min) / OD 1 min) x 100. β-glucan fed groups were compared to control groups fed β-glucan-free feed. *: (p<0.05), **: (p<0.01.)
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