The relation between the daily catch of sardine caught by the two Hisago trap net operated in the Tai fishing ground located on the western coast of Wakasa Bay and the meteorological factors such as low pressure, wind velocity, wind direction and atmospheric temperature over several days (represented by “-n” day) before the day on which the fishing is operated is statist-ically analysed. This study is limitted to the spring fishing from 1952 to 1955. The good catch is expected under the following conditions:
1. That low pressures are moving in such a pattern that a new low pressure is gradually approaching to the ground after an another low pressure has been leaving from there from -2 to -1 day during the two successive days.
2. That the direction of the strongest wind is northerly (NE-NW) and the direction of the wind which, blows most frequently is south-east (SE) in -1 day, beside these the wind velocity is in the range up to 4 (7.4m/sec.) in BEUFORT's wind-class during the two successive days before it, and
3. That the atmospheric temperature ascent gradually from -2 to -1 day.