1953 年 19 巻 4 号 p. 398-404
Regular monthly observations as well as those conducted at irregular intervals from 1949 to 1952 inclusive show that the spawning period of sardine and round herring covers November to next April but that of Anchovy extends all year round along the coast of Miyazaki Prefecture. Frequency distribution of ovarian egg diameter of sardine and round herring was found unimo. dal in samples obtained from June to October. But ovary weight of these fishes increase rapidly in November or December when frequency distribution of ovarian egg diameter assumes bimodal or trimodal when examined as before. Anchovy stand also quite different from the other two in ovarian weight and egg diameter, i.e., no precise period of rapid increase of ovary was not found and egg diameter distribution always differs in individuals even taken at the same time and locality.