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－15－Scene Judgement Countermeasures RemarksTrolling linefishingVessels carrying on trollingline fishing are not fishingvessels in a legal sense.It is, however, advisable thatthese vessels be avoided....

－15－Scene Judgement Countermeasures RemarksTrolling linefishingVessels carrying on trollingline fishing are not fishingvessels in a legal sense.It is, however, advisable thatthese vessels be avoided whilepaying sufficient attention tosituation.It must also be rememberedthat the lengths of trolling linesare 40 to 50 metres.Fishing operations in daytime.Trolling line fishing isfrequently carried onthroughout the waters ofbay areas and along thecoast of JapanStick-held dip netfishing formackerel pikeMarker fishingSquid fishingThese are often carried on ingroups at night Sometimessearch lights are used.It is advisable that no attemptbe made to pass through agroup of fishing vessels, andcollision-averting manoeuvresshould be done soon, whilepaying sufficient attention toneighbouring vessels.Fishing operations at night.Seen throughout the watersalong the coasts of JapanStick-held dip nets arestretched out downstream ofthe tidal current Mackerelfishing is carried on withfishing vessels heading towindward.Drift net (drift gillnet) fishingMarker flags arenormally used fordrift gill netfishing, butsometimes they arenot used, must betakenBuoys and floats are arrangedbetween marker flags withlights.Because gill nets are arranged5 to 6 metres beneath buoys,the ship cannot pass over thesenets.Collision-averting manoeuvresin daytime.Drift gill net fishing at nighttime.Yellowtail, flying fish,mackerel pike, salmon troutDrift gill net fishingFlying fish, mackerel pikeThere are only buoys (floatscan submerge by 4 to 6metres).Drift net fishingfor Spanishmackerel.This is a form ofdrift gill netfishing.Marker lights are provided atboth ends and at the middle,and a float is provided at themiddle.The ship cannot pass over thenet.The sketch shows a scene inSetonaikai.Setonaikai, Ise Wan, andareas in Kyushu.Pay attention to markerlights, as they have differentcolours.Bottom gill netfishingCod, yellowtail,Rhinoraja, atkamackerelBottom gill nets are often fittedwith a large buoy and markerlights. An operating boatstands by in the vicinity of thenets.Passing over bottom gill netsposes no problem if no attemptis made to pass directly overthe buoy.Bottom gill nets are arrangedin a direction normal to thecurrent.Often seen in the Japan Sea.Bottom gill net fishing isperformed both during theday and at night