Sea birds were counted from the upper deck of the fishing boat which fish Bonitoes, on the way between fishing-grounds and fishing ports, 1960-61. On the 1 st. and 2 nd. voyages, from Yaizu, Shizuoka to Mariana Is. July-August 1960, 5 species) Large all dark Storm Petrel Oceanodroma sp., Gadfly Petrel Pterodroma sp., Wedge-tailed Shearwater Puffinus pacificus, Streaked Shearwater Calonectris leucomelas and Sooty Tern Sterna fuscata) were common. On the 3 rd. and 4th. voyages, from Tago, Shizuoka to Tori-shima, May-June 1961, 3 species (Large all dark Storm Petrel sp., Slender-billed shearwater Puffinus tenuirostris and Streaked Shearwater) were common. On the 5th voyage, from Yaizu to "Higashi-Oki" (145°E, 35°N), June-July 1961, 4 species (Large all dark Storm Petrel sp., Gadfly Petrel sp., Wedge-tailed Shearwater and Streaked Shearwater) were common.