スケソウ漁業中の以東底曳船の作業時間-III : 深度と作業時間の関係

概要

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The times expended on respective steps of fishing works of the Danish seiners during the season of Alaska pollack fishery in 1964, showed the following relations to the depth of fishing grounds (40m or 80m to 150m): 1. The laying time increased with depth at a negligibly small rate of 33 seconds per 100m. This is due to such fact that the warp of the same length was used throughout the fishing season, because a depth of 150m is still in the range fished with the minimum length of warp. 2. The sinking-pulling time increased with depth at a rate of four minutes per 100m. 3. The hauling-brailing time did not show the difference with depth in the range from 80m to 150m, when the influence of the bathymetric difference of catch was treated including into the influence of depth. 4. As the consequence, the time to complete a haul increased with the depth at the rate of four minutes per 100m. This corresponded to only three percents of the working time. 5. No clear relation could be found in the interval between the succeeding hauls to the depth.
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