Adherence/NBT (nitroblue tetrazolium) and respiratory burst process assay spotlights on the non-specific
immune response and the antibacterial mechanisms of the tested substances. The results of the current feeding
trial showed a significant increase of nitroblue tetrazolium (NBT) and Neutrophil Adherence values in most of
the S. platensis supplemented groups. The current results agree with those of Duncan and Klesius (1996) who
reported enhancement of the peritoneal phagocytes from channel catfish, I. punctatus fed S. platensis, Spirulina
algae contain carotenoids, which specifically improving fish health and increasing the ability to fight off infections
through the reduction of stress levels. In addition, Watanuki et al. (1990) reported that S. platensis activated the
functions of leucocytes, such as phagocytosis and production of superoxide, and cytokines production in
common carp, Cyprinus carpio