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Two feeding trials were conducted to determine the effects of dietary supplementation with Hizikia fusiformis or Ecklonia cava on the non-specifi c immune responses of parrot fi sh Oplegnathus fasciatus. Fish were fed experimental diets to which H. fusiformis or E. cava powder were added to fi nal concentrations of 0, 2, 4 and 6%, respectively. After feeding for two weeks, phagocytic activity was signifi cantly higher in fi sh fed diets containing H. fusiformis, but not E. cava, than in fi sh fed the basal diet. Lysozyme activity was signifi cantly increased in the fi sh fed diets containing 6% H. fusiformis and E. cava. Myeloperoxidase activity was also signifi cantly higher in fi sh fed diets containing 2 and 4% H. fusiformis, as compared to the basal diet, but not in those fi sh fed E. cava. These two studies indicate that dietary supplementation with H. fusiformis or E. cava could enhance the innate immune responses of parrot fi sh during their growth stage. |
