Mechanisms of Digestive Enzyme Response to Acute Salinity Stress in Juvenile Yellowfin Tuna (<i>Thunnus albacares</i>).

In the pyloric ceca ( Figure 3 c) tissue of juvenile yellowfin tuna, the α-amylase activity of the stress group was significantly higher than that of the control group from 24 h to 48 h ( p < 0.05), and the α-amylase activity of the stress group showed a trend of decreasing and then increasing compared with that of the control group.

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In this experiment, with the decrease of salinity on the digestive enzyme activity of the digestive organs of juvenile yellowfin tuna, pepsin, and trypsin showed a decreasing trend, α-amylase, lipase, and chymotrypsin showed an increasing trend except for the stomach tissue which showed a decreasing trend.

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