Feeding and Oxygen Consumption: Indicators of Health in the Bay Scallop (Argopecten irradians)
IAAAM Archive
Michael J. Calabrese
Registry of Tumors in Lower Animals, National Museum of Natural History, Smithsonian Institution, Washington DC

Ventilation rates and oxygen consumption rates of the bay scallop, Argopecten irradians, were monitored for periods of 28 to 72 hours at temperatures of 10, 15 and 29°C. The scallops were placed in a Brett-type swimming speed respirometer.  This allowed the simultaneous monitoring of ventilation rate and oxygen consumption.  Mean ventilation rates for all scallops at the three temperatures were: 0.55 L/animal hour at 10°C, 0.51 L/animal hour at 15°Celsius, and 1.28 L/animal hour at 20°C, while mean oxygen consumption rates were: 0.0375 ml 02 /hr/gm wet weight at 10°Celsius, 0.1717 ml 02 /hr/gm wet weight at 15°C, and 0.2427 ml 02 /hr/gm wet weight at 20°C. The ratio of ventilation rate to oxygen consumption was determined at each temperature to give an indication of feeding efficiency.  At 10°C the scallops pumped 14 L/ml 02 consumed, at 15°Celsius they pumped 3L/ml 0 2 consumed, and at 20°Celsius they pumped 5.3 L/ml 02 consumed.  Oxygen consumption was quite uniform during the experimental runs.  Scalloped at all temperatures tested were able to bring the oxygen tension down to 0.2 ppm and recover when placed in a tank of aerated water.  During the experimental runs it was noted that the fluorescence of the algae exhibited circadian rhythms.

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Michael J. Calabrese


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