For the Safety Navigation In Japanese Coastal Waters page 107/120

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概要：
－5－Fig. R-9 Purse Seine Fishing(4) Gill net fishingGrill net fishing is a fishing method by which gill nets are set in a direction normal to thestream of moving schools of fish, w....

－5－Fig. R-9 Purse Seine Fishing(4) Gill net fishingGrill net fishing is a fishing method by which gill nets are set in a direction normal to thestream of moving schools of fish, whereby the nets entangle the gill covers of fish.(1) Surface gill net fishingSurface gill net fishing is applied to catch fish in the surface or near surface layers. Gillnets, in this case, are seldom fixed, but are allowed to drift, in many cases, as mentionedlater. With the fixed gill net fishing method, the direction of stretching gill nets is irrelevantto the directions of wind and tidal current, but they are normally set approximatately normalto the direction of current. Due to the nature of this fishing method, these nets are rarelyarranged in congested waters. The length of the float line is greater in the western area (20 to70 metres) and becomes smaller to north. (See Fig. R-10)Fig. R-10 Fixed Gill Net Fishing