Impacts on the immune system of Cyprinus carpio exposure with a mixed algal extract against Aeromonas hydrophila

This study evaluates the influence of mixed algal extract (Chlorella vulgaris, Euglena viridis and Spirulina platensis) on common carp Cyprinus Carpio, which infected infect with bacterial pathogen Aeromonas hydrophila. C. carpio was administered intraperitoneally with various doses such as methanol extract (0, 0,1, 1, 10 and 100 mg/kg). The immunological parameters of fish blood and serum samples (Neutrophil activity, Lysozyme activity, Serum myeloperoxidase intensity, Serum bactericidal activity, and Serum antiprotease activity) were investigated at 7, 14, 21, and 28 days of post-immunization. Fish had been tested by virulent A. hydrophila for 30 days after treatment and 14 days after infection were identified with mortalities. The findings showed that neutrophil levels, lysozyme activity, serum bactericidal activity, myeloperoxidase activity, and serum antiprotease activity significantly enhanced (p<0.05) compared to untreated control. Mixed dietary algae at 1 and 10 mg/kg levels demonstrated slightly (p<0.05) higher relative percentage survival (90 percent) than control against A. hydrophila disease infection. Results indicated that mixed algal extract in C. carpio positively impacts non-specific immune parameters and boosts disease tolerance to A. hydrophila infections.