The regressive relations of the hauling-brailing time and the time expended to complete a haul on catch were examined after stratification of the records into the wave-grade groups, for the purpose of finding out the influence of wind wave after elimination of the influence of different amount of catch. And the results obtained are summarized as follows:
1. The time expended to complete a haul and the hauling-brailing time showed very significant regressive relation on catch in all the grades of wind wave.
2. These times had similar inclination on the catch and the grade of wind wave to each other, as shown in Fig. 2, in the general trend of the change of the constant with the grade of wind wave and in the values of coefficient at respective grades of wind wave except at the grade 7.
3. The influence of wind wave on the hauling-brailing time was far smaller than that of the catch, and was as small as to modify the time-catch relation slightly.
4. The wind wave in the range from the grade 1 to 5 did not cause significant difference in the hauling-brailing time, but the wind wave over the grade 6 retarded this step of work.
5. The increase in the hauling-brailing time with catch was the largest in the grade 2 and the second in the grade 3, although the difference due to this fact was not so large as modifying the above-mentioned general trend.