ON THE RESPIRATION IN SCALLOPS (LAMELLIBRANCHIATA)

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Abstract
In accordance with the absence of prolonged ventilation pauses common in several other spp. of lamellibranchs, the O2 uptake in resting specimens of Pecten grandis Sol. and P. irradians Lam. was found to be quite uniform. In both spp. QO2, at 20[degree]C, was found to be about 70 ml/kg/hour. This value is about the same as the O2 consumption of the average boreal sedentary lamellibranch. The O2 uptake was independent of the O2 tension down to a concentration of about 11/2 ml O2/l. The percentage of O2 withdrawn from the inhaled water ranged from 0.5-13%. It was demonstrated that in the stream of water escaping from the cloacal chamber of P. irradians Lam. considerable gradients in the concentration of 02 occur.