抄録
The size of meshes and their strength were measured with 6 parts (I to VI arranged from the sea surface toward the bottom) of a net used in a fishing ground 50m deep. The size of mesh is, in its median, a little greater at the part, which has been situated at the intermediate level (III, IV) than at the remaining. Its variation is locally the less, the greater the median. The median of the strength decreases from the upper to the lower levels. Its variation at the lowermost parts (V, VI) is greater than that at the uppermost, but less than that at the intermediate parts.
The reason why the net had become less strong at lower parts, was ascribed to the fact known experimentally, that the lower meshes of a loaded net, which is spread on a vertical frame, as is the case of the used net, is stretched more tightly than the upper meshes.
