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1 April 2009 Short-term Responses of the Adults of the Common Japanese Intertidal Crab, Hemigrapsus takanoi (Decapoda: Brachyura: Grapsoidea) at Different Salinities: Osmoregulation, Oxygen Consumption, and Ammonia Excretion
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Abstract

Intermolt to premolt males of Hemigrapsus takanoi were exposed to salinities of 0, 10, 20 (control), 30, and 40 ppt. After 2, 4, and 6 h of exposure, oxygen consumption and ammonia excretion were measured. Hemolymph osmolality was measured at the end of 8 h. No mortalities were observed until hemolymph sampling. Hemolymph osmolality was maintained between 570 to 840 mmol/kg. Oxygen consumption increased significantly only at 0 ppt, compared to the control (20 ppt). Ammonia excretion levels showed a remarkable increase at 0 ppt. These results indicate that this species expends increased metabolic effort to tolerate abrupt salinity changes to freshwater compared to brackish or seawater.

Junpei Shinji, Carlos A. Strüssmann, Marcy N. Wilder, and Seiichi Watanabe "Short-term Responses of the Adults of the Common Japanese Intertidal Crab, Hemigrapsus takanoi (Decapoda: Brachyura: Grapsoidea) at Different Salinities: Osmoregulation, Oxygen Consumption, and Ammonia Excretion," Journal of Crustacean Biology 29(2), 269-272, (1 April 2009). https://doi.org/10.1651/08-2998R.1
Received: 25 March 2008; Accepted: 1 August 2008; Published: 1 April 2009
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