Hepatic Health and Humoral Immunological Parameters of Common Carp (Cyprinus carpio) Fed Lactic Acid-supplemented Diets

Background: Organic acids and their salts are known as appropriate substitutes in feed for improving the health, growth, performance of fish. Objectives: The present study was conducted to determine effects dietary lactic acid supplementation on immunological factors, hepatic enzyme activity, plasma proteins common carp, Cyprinus carpio. fish were fed diets mentioned above 56 days, then growth performance, humoral immunity, enzymes assessed. Methods: A total 180 (mean weight=25 g) randomly distributed twelve tanks (150 L water each tank) four treatments, containing 0, 2.5, 5, 10 g/kg (T0, T1, T2, T3, respectively). Results: At end feeding trial, T2 showed significantly higher than T0. Plasma protein, albumin, globulin levels T1-T3 that However, protein decreased by elevation concentration (10 g/kg). No significant differences observed aspartate aminotransferase (AST) alkaline phosphatase (ALP) activity among although alanine (ALT) fish-fed (T1-T3) compared with control group (T0). All immunity parameters (lysozyme, complement, immunoglobulin, bactericidal activity) increased treatments T0 group. Conclusion: Overall, improves parameters, health. According results, (2.5-5 g/kg) is recommended preparing carp feed.