Effect of Water Temperature on Ventilation in the Pen-shell Atrina (Servatrina) lischkeana

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In the pen-shell, <I>Atyina (Servatyina) lischkeana</I>, effects of water temperature on ventilation and ciliary movement of the gills were examined by raising the temperature 3°C every 1 hour starting from 20°C. Ventilation volume was measured directly with an electromagnetic flowmeter under normoxic and hypoxic conditions (54mmHg oxygen partial pressure) . Under these conditions, ventilation volume increased gradually to 29°C, then ventilation stopped at 32°C. Ciliary movement, measured by moving speed of a piece of thin film on the gill surface, gradually increased with rising temperature and reached maximum at 32°C, then decreased at 36°C. From these results, the pen shell must prevent a rise in body temperature at the time of acute increase in ambient temperature by stopping the inflow warmer water into the mantle cavity and by circulating cooler water in the mantle cavity by ciliary movement. This should explain well the physiological behavior of the pen shell which burrows perpendicularly, and opens the inhalant and exhalant orifices on the sea bottom.
日本水産増殖学会の論文