Effect of dissolved oxygen on the acid-base balance and ion concentration of Taiwan abalone Haliotis diversicolor supertexta

Taiwan abalone Haliotis diversicolor supertexta exposed to different concentrations of dissolved oxygen (DO) at 7.18, 4.98, 3.08, and 2.11 mg/1 for 3, 6, 12, 24, 48, 72, and 96 h were examined for hemolymph osmolality, sodium concentration, acid-base balance, and glucose and lactate levels at 35 parts per thousand and 25 degreesC. Abalone following 12-h exposure to 2.11 and 3.08 mg/1 DO showed increases in hemolymph osmolality, sodium, and glucose and lactate levels. The level of hemolymph pCO(2) was inversely related to DO concentration, whereas the levels of hemolymph pH, pO(2), HCO3-, and TCO2 were directly related to DO concentration. It is concluded that the stress of DO at 3.08 mg/1 and lower causes disturbance in the acid-base balance as well as anaerobic metabolism of H. diversicolor supertexta, resulting in glucose and lactate productions and acidosis in a short-term period. (C) 2004 Elsevier B.V. All rights reserved.