Abstract
This report dealt with the daily reports during the entire season in 1963 by 22 of the Danish seiners belonging to one of the fish-meal fleets which fished in the Bering Sea. The stratification of the records of daily catch per boat according to the area, the depth, and to the grade of daily haul made it possible to find the following tendencies:
1. The frequency distribution of daily catch per boat yielded by the same grade of daily hauls in the same depth zones was in most of the strata agreeable to the normal series, but that yielded by the highest grade of daily haul in few of the depth zones was kept in the logarithmic normal series (cf. Figs. 1 and 2).
2. The bathymetric difference of daily hauls made it difficult to get a good result of that of daily catch yielded by the same grade of daily haul.
3. In the same depth zone of the same area, the daily catch per boat was poorer on the days when the boats conducted frequent hauling than on the days when the boats conducted less frequent hauling (cf. Fig. 2).
4. These findings and the deviation of the daily hauls in the same depth zone suggested such possibility that the frequency distribution of daily catch per boat in the same depth zones of Area A or B composed of many strata of the records with different average of daily catch, and the distribution before stratification according to the grades of daily hauls approximated superficially to the logarithmic normal series.
