Abstract
Concerning the larva of the swordfish, Lütken (1880) described them of about 35 mm found in the Atlantic Ocean, but there is no report on the existence in the neighbouring seas of Japan. The author caught three larvae of total length 11.0-27.4 mm in Kuroshio Region (the ocean current sweeping the southern coast of Japan) in May, 1949 and March, 1950. In this report their external appearance is described, and it is stated that they are similar to the adult of Istiophoridae except that they have no ventral fin in the larval stage.
