Oxygen and acid-base status of hemolymph in the densely lamellated oyster Ostrea denselamellosa in normoxic conditions
2018
Handa, T. (National Fisheries University, Shimonoseki City, Yamaguchi Pref. (Japan). Department of Applied Aquabiology) | Araki, A. | Yamamoto, K.
We examined hemolymph O2 partial pressure (Po2), pH, total CO2 content (Tco2), CO2 partial pressure (Pco2) and bicarbonate concentration ([HCO3sup(-)]) in order to evaluate the acid-base balance of the densely lamellated oyster Ostrea denselamellosa in normoxic conditions. Hemolymph was collected anaerobically through a cannula inserted into the adductor muscle of O. denselamellosa. The mean values of hemolymph Po2, pH, and Tco2 were 64.7 torr, 7.576 and 1.22 mM/l, respectively. Using alpha co2 and pKapp determined in this study, the hemolymph Pco2 and [HCO3sup(-)] were calculated as 1.10 torr and 1.17 mM/l, respectively. These hemolymph properties were compared with those of other marine bivalves. Ostrea denselamellosa seemed to efficiently discharge CO2 and maintain high hemolymph pH in normoxic conditions.
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