To investigate the impact of tea polyphenols on the health of Pelteobagrus fulvidraco under ammonia stress, a total of 480 juvenile P. fulvidraco were divided into four groups receiving tea polyphenols supplemented diets at 0 mg kg −1 (C group), 200 mg kg −1 (L group), 400 mg kg −1 (M group) and 600 mg kg −1 (H group) for 56 days. Ammonia stress was applied from days 28 to 56. The results showed that intestinal histological da...