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－17－Scene Judgement Countermeasures RemarksSmall motor-boatbottom trawlfishingTrawling is carried on by onemotor-boat, provided with asuper-structure at poop. Theboat pulls a steel wiseconnected to ....

－17－Scene Judgement Countermeasures RemarksSmall motor-boatbottom trawlfishingTrawling is carried on by onemotor-boat, provided with asuper-structure at poop. Theboat pulls a steel wiseconnected to the bottom trawlline.Because the trawl line drawsfor a considerable length,collision-averting manoeuvresmust be done with a sufficientallowance of time left.Often seen in coastal watersfacing oceans, and trafficroutes in inland waters.Offshoremotor-boat bottomtrawl fishingOffshore motor-boat bottomtrawl fishing is mailyperformed by one boat.Because the trawl line isrelatively long,collision-averting manoeuvresmust leave a sufficientallowance of time.metres.Motor-boats range from 15to 124 tons.Fishing grounds are inoffshore waters.This type of trawl fishing iscarried on in waters with adepth up to 500-600Offshoremotor-boat bottomtrawl fishing(2-boat trawl)When trawling is carried on bytwo boats, the length of thetrawl line is relatively short,but a thick line is used. It canbe easily identified as twotrawl boats move as a pair.Collision-averting manoeuvresmust leave a sufficientallowance of time.In many cases, offshorebottom trawl boats rangebetween 50 and 60 tonsSome are operated in theEast China Sea and in theSouth Pacific Ocean.Two purse seinenettersTwo purse seine netters andtwo to three assisting boatsoperate as a group.Because there are buoys andfloats on the sea surface, noattempt can be made to assover the nets. Fish-collectinglights are scarcely used. Thediameter of a purse seine netranges from about 320 to 470metres. In the case of one-boatoperation, the diameter isabout 160 to 320 metres.Collision-averting manoeuvresmust leave an ample allowanceof time.Small purse seinenetters-motor boats with atonnage less than 5 tons, ornon-powered boats.Medium-size purse seinenettefs-5 to 60 tonsIn addition to the above,medium-sized purse seinenetters are permitted tooperate within designatedfishing areas. Depending onthe type of fishing, the useof fish collecting lights isprohibited.Sardine drag net(sardine drag netdrawn by twoboats)Because if is drawn by twoboats, it gives the falseimpression it is a bottom trawlnet, identification is possiblefrom the trailing buoy.No attempt should be made tocome close to the netPay special attention when theship passes after the fishingboat.Often seen in Setonaikaiareas and Ise Wan.