フイッシュミール船団所属以東底曳船のベーリング海における日間揚網回数分布の深度変化

抄録

1. This report deals with the bathymetric difference in the frequency distribution of daily hauls recorded during an entire season in 1963 by 22 Danish seiners belonging to one of the fish-meal fleets working in the Bering Sea.
2. Records were treated being stratified first into three areas according to the difference in locality as well as in season and then into 11 depth zones of 10m interval.
3. The series of frequency of day-and-boat by depth zones in respect of the daily hauls plotted against (11-x) on logarithmic scale agreed excellently with normal series (here, a boat conducted x hauls a day).
4. The bathymetric differences in the average and standard deviation of daily hauls are shown in Fig. 1, which shows a rough tendency of decrease in daily hauls in accordance with increase in depth, as if suggesting the increase in depth being the barrier of frequent hauling, although there still remains a doubt whether this tendency is essential or nothing but a chance coincidence.