Dietary supplementation of ginger (Zingiber officinale) essential oil exhibits positive immunomodulatory effects on the Neotropical catfish Pseudoplatystoma reticulatum without negative effects on fish liver histomorphometry

This study evaluated the dietary supplementation of ginger Zingiber officinale essential oil for Neotropical catfish Pseudoplatystoma reticulatum, its effects on fish hematology, immunology, response these variables to induction stress (exposition air 3 min), and a bacterial challenge with Aeromonas hydrophila, liver histomorphometry. Three levels were (0.5, 1.0 1.5%) in addition control group (0%) feeding trial 65 days triplicate. Fish hematology immunology assessed at five different moments: after (0), (stress), three points (3, 6 24 h post-challenge). fed supplemented diets did not exhibit significant differences between hematocrit 0-sample point post-challenge (P ≥ 0.05), while diet presented significantly lower values when comparing those same two moments < 0.05). The thrombocytes count 0.5% was higher than all other groups their total leukocytes also treatments Although results mentioned above indicate that had positive health fish, no survival A. hydrophila observed Lastly, histomorphometry suggests negatively impact hepatocytes.