Field experiments by using laver culture nets were carried out to evaluate the effect of decreasing current velocity on new settling of planktonic bivalve larvae at a coast of Matsuzaka. The curent velocity of thearea of setting nets corresponding to that of the control area, without setting nets, were decreased due to attaching a high density of seaweed on the nets. The new settlers density of the area of the setting nets were always higher than that of the control area, which indicate that the new settling of the planktonic larvae was accelerated due to decreasing current velocity. Temporal shell length variations (200-300μm) including the new settlers length collected as the planktonic larvae in the seawater indicate that the new settlers are moved and re-suspended due to a strong wave action.