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  • Title: Effect of nitrite on immune response of Taiwan abalone Haliotis diversicolor supertexta and its susceptibility to Vibrio parahaemolyticus.
    Author: Cheng W, Hsiao IS, Chen JC.
    Journal: Dis Aquat Organ; 2004 Aug 09; 60(2):157-64. PubMed ID: 15460860.
    Abstract:
    Taiwan abalones Haliotis diversicolor supertexta held in 30% per thousand seawater and 26 degrees C were injected with tryptic soy broth (TSB)-grown Vibrioparahaemolyticus (1.6 x 10(5) CFU [colony-forming units] abalone(-1)), and then placed in water containing different concentrations of nitrite-N (nitrite as nitrogen): 0.01 mg l(-1) (control), 1.05, 3.04, 5.10 and 10.06 mg l(-1). Mortality of the abalones increased in direct parallel to ambient nitrite-N concentration. Over 12 to 48 h, the mortality of V. parahaemolyticus-injected abalones held in 3.04 mg l(-1) nitrite-N was significantly higher than that of abalones in the control solution. Abalones that had been exposed to control, 0.96, 2.95, 5.03 and 10.16 mg l(-1) nitrite-N for 24, 72 and 120 h were examined for THC (total hemocyte count), phenoloxidase activity, respiratory bursts (release of superoxide anion), phagocytic activity, and clearance efficiency of V. parahaemolyticus. The THC increased in abalone after 72 h exposure to 0.96 and 2.95 mg l(-1) nitrite-N, but decreased in abalones after 24 h exposure to 5.03 and 10.16 mg l(-1) nitrite-N. Phenoloxidase activity and respiratory bursts increased, while phagocytic activity and clearance efficiency decreased in abalones exposed to > or = 0.96 mg l(-1) nitrite-N for 24 h. It is concluded that nitrite-N in water at concentrations as low as 0.96 mg l(-1) weakens the immune response and increases mortality of H. diversicolor supertexta infected with V. parahaemolyticus.
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