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Haemolymph protein, ammonia, urea, urate, glucose, L-lactate, osmolality, ion concentrations and acid-base balance were measured when Japanese lobster Panulirus japonicus were exposed to air at 5, 15, and 25°C for 3 h up to 48 h. All lobsters in aerial exposure at 5 and 15°C survived after 48 h, whereas 60% of the lobsters survived at 25°C after 24 h. Haemolymph haemocyanin, protein, pCO2, ammonia, urea, urate, L-lactate, osmolality, Cl-, Ca2+, and Mg2+ increased linearly with exposure time. However, haemolymph pH and glucose were inversely related to exposure time. Lobsters in aerial exposure at 5 and 15°C significantly increased their HCO3 -, whereas lobsters in aerial exposure at 25°C decreased their haemolymph HCO3 -. Lobsters in 24 h aerial exposure at 25°C increased their haemolymph ammonia, urea, and L-lactate, respectively more than 8, 3 and 572 times, whereas lobsters in 24 h aerial exposure at 5°C increased to 7, 2, and 275 times of submerged values. The ability of P. japonicus to survive longer at low temperatures (5 and 15°C) is likely due to lower accumulation of ammonia, urea, urate, and L-lactate, and buffering due to HCO3 -.

Les protéines de l'hémolymphe, l'ammoniaque, l'urée, l'urate, le glucose, le L-lactate, l'osmolalité, la concentration ionique et l'équilibre acide-base ont été mesurés chez Panulirus japonicus exposé à l'air à 5, 15 et 25°C pendant 3 à 48 heures. Tous les animaux exposés à 5 et 15°C ont survécu après 48 heures, tandis que 60% ont survécu à 25°C après 24 h. L'hémocyanine de l'hémolymphe, les protéines, le pCO2, l'ammonium, l'urée, l'urate, le L-lactate, l'osmolalité, les ions Cl-, Ca2+ et Mg2+ augmentent de façon linéaire avec le temps d'exposition. Cependant, le pH de l'hémolymphe et le glucose varient en relation inverse par rapport au temps d'exposition. Les Panulirus exposés à l'air à 5 et 15°C ont leur concentration en HCO3 -de l'hémolymphe, augmentée de façon significative tandis que cette valeur diminue chez ceux exposés à l'air à 25°C. Ceux exposés pendant 24 h à 25°C montrent une augmentation de leur concentration dans l'hémolymphe, d'ammonium, d'urée, et de L-lactate, respectivement de plus de 8, 3 et 572 fois, tandis que les Panulirus exposés 24 h à 5°C augmentent de 7, 2 et 275 fois par rapport aux valeurs mesurées chez les animaux en eau. La capacité de P.japonicus à survivre plus longtemps à de basses températures (5 et 15°C) est probablement dûe à une plus faible accumulation d'ammonium, d'urée, d'urate, et de L-lactate, et à l'effet tampon assuré par HCO3 -.

Affiliations: 1: Department of Aquaculture, National Taiwan Ocean University, Keelung, Taiwan 202, Republic of China


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