Spirulina platensis and Nigella sativa as biocontrol of some bacterial diseases in Oreochromis niloticus

Authors

1 Department of Fish Diseases and Management, Faculty of Veterinary Medicine, Cairo University

2 Department of Fish Diseases Research, Animal Health Research Institute, Dokki, Giza

Abstract

This study was conducted to evaluate the effect of Spirulina platensis and Nigella sativa, and both of them at a rate (7.5g/kg ration, 0.5g/100g ration, and mix of them), respectively as a feed additive for 8 weeks on growth performance, blood picture and immune system in Oreochromis niloticus (O. niloticus) before and after challenge with A. hydrophila and resistance against Aeromonas hydrophila and Streptococcus dysgalactiae. The results indicated that the addition of Spirulina or Nigella to diet improves growth performance, health condition, and enhancement of cellular and humoral immune responses specifically (Phagocytic activity, lysozyme, nitric oxide, total protein and its fraction especially gamma globulin) either before and after challenged tests and Increase resistance against bacterial infection. The combination of Spirulina platensis and Nigella sativa showed the highest values of growth performance and immunological parameters and gave the lowest mortality percent against bacterial infection.

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