The settlement of mussel larvae in mussel beds developing on piers was observed from March to May, 1985 in Kurihama Bay near the mouth of Tokyo Bay. Settlement depth was investigated using fouling ropes suspended at selected depths in the coast of Hiratsuka. Number of D-shaped early larvae and veliconcha late larvae peaked on April 5 and 12 respectively. Number of plantigrades settling on fouling ropes was highest during the period April 10-17. Number of mussels settling in the mussel beds on the piers in the less than 10mm size class began to increase after April 23 and reached 40% of the total in the beds on May 8. Mussel settlement on the fouling ropes submerged at different depths for a month from the end of April was observed. Settlement was most abundant in the middle layer.
