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Abstract
Gut melatonin levels in carp (Catla catla) increased significantly during Aeromonas hydrophila infection over 3 to 6 days.
- Microscopic examination revealed degenerative changes in the gut lining of infected fish.
- The activity of digestive enzymes decreased in response to infection.
- Melatonin levels and the activity of antioxidative enzymes increased progressively with infection duration.
- A positive correlation was observed between gut melatonin concentrations and antioxidative enzyme activity.
- A negative correlation was found between melatonin levels and digestive enzyme activity.
- Changes in gut and serum melatonin levels suggest a potential role of the gut in regulating circulating melatonin.
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