2012 Volume 60 Issue 3 Pages 393-396
Flow under the influence of elevated temperatures through three respiratory pores of the abalone Haliotis (Nordotis) discus discus was examined by the direct measurement method of the volume of flowing water. The water temperature was elevated from 18°C at the rate of 3°C every hour. Through the three respiratory pores, the water was only exhaled from the shell cavity. The exhaled water volume of the pore in the forefront (28 ml/min/kgTW: total weight) was smaller than those of other two pores (57-67 ml/min/kgTW) at 18°C. When water temperature rose to 30°C, the water volume of the other two pores increased to 1.5-1.6 times, although the water volume of the pore in the forefront hardly changed. At each temperature, the total water volume of all pores maintained to be constant by the coordinated volume of each pore, even if the volume of each pore changed.