Effect of Water Temperature on Ventilation in the Pacific Oyster Crassostrea gigas

マガキの鰓換水に及ぼす水温の影響

Effect of Water Temperature on Ventilation in the Pacific Oyster Crassostrea gigas

Creators Yamamoto Ken-ichi

Creators Handa Takeshi

The effect of water temperature on the ventilation in the Pacific oyster Crassostrea gigas was examined by the direct measurement method of ventilation volume. The water temperature was elevated 3℃ every hour. The ventilation volume increased from 1.32 l/min/kg at 20℃ to 2.35 l/min/kg at 26℃ with the rise in the water temperature, and then decreased to 0 l/min/kg at 37℃. The moving speed of vinyl film put on the gill surface (activity of ciliary movement) increased from 31.3 mm/min at 20℃ to 56.3 mm/min at 35℃ , and then decreased to 0 mm/min at 41℃. These results reveal that the Pacific oyster would increase the preying quantity by the increase of the ventilation volume with the rise in the water temperature.

[ISSN]0370-9361