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Aeromonas hydrophila  severely hampers the farmed catfish production. A 60-day feeding trial was conducted to study the effect of  Andrographis paniculata  leaf extract on growth, immunomodulation, and disease outbreak against  A. hydrophila  in  Pangasianodon hypophthalmus . A total of 180 juveniles of  P. hypophthalmus  (avg. wt. 123.33 ± 1.8 g) were distributed randomly in four groups following a completely randomized design in triplicate. Four experimental diets—C (no extract), T 1  (1%), T 2  (2%), and T 3  (4%)—were prepared and fed twice daily. Growth metrics were calculated after 45 days and challenged with  A. hydrophila . Relative percentage survival (RPS) was recorded over 15 days postchallenge. Results indicated that  A. paniculata  extract has a positive effect on hematobiochemical parameters and immune response. The highest (P &lt; 0.05) pre- and postchallenge serum lysozyme activity, respiratory burst activity, and globulin level were found in the T 2  group and lowest in the T 0  group. Significantly (P &lt; 0.05) higher percentage weight gain and SGR and lowest FCR were found in the T 2  group than in the other groups. RPS was highest (P &lt; 0.05) in the T 2  group, followed by the T 1  and T 3  groups, compared to the control. Results suggest that  A. paniculata  leaf extract at a level of 2% could improve growth, immunity, and disease resistance against  A. hydrophila  by enhancing innate immunity in  P. hypophthalmus.

journal of applied aquaculture

Effect of dietary  Andrographis paniculata  leaf extract on growth, immunity, and disease resistance against  Aeromonas hydrophila  in  Pangasianodon hypopthalmus