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The crayfish-shaped artificial bait for octopus drift line is manufactured, into which is made to insertordinary bait. The effects of the artificial bait are confirmed through the analysis of octopussbehavior in thelaboratory in comparison with the existing bait of pig-fat skin, and the investigation of the octopus catch onthe sea, and in addition, the examination of the water quality in relation to the bait to be inserted into theartificial bait is done together. The artificial bait is red in color, 10.5cm in the length of the body, and 29g inweight. The octopus behavior in relation to the bait in the laboratory has shown a good result in which morethan 30% of the octopuses rushed to the artificial bait. In the analysis of the octopus sitting time by the bait,the octopus stayed longer with the artificial bait(63.7%) than the pig-fat skin(25.1%). The octopus sittingtime at the artificial bait inserted with frozen squid(48.8 , 44.6 ) is shown to be longer than that of thepig-fat skin(36.9 ) or boiled fish paste(21.2 ). In the analysis of sitting frequency to the bait, the case ofthe artificial bait(total 17 times) was more than that of the pig-fat skin(total 3 times), and the case of theartificial bait with frozen squid attracted the octopuses more frequently than that of the pig-fat skin or theboiled fish paste. In the field experiment, the fishing boat A(Manseon-ho, 1.22tons) caught the total 93octopuses, while the fishing boat B(Ilho-ho, 0.73tons) caught the total 154 octopuses, all of which weighedless than 9.0kg. In the comparison with the total catch, the case with the artificial bait was a little higher thanthat of the pig-fat skin(**p#0.05). In the analysis of the water quality in relation to the baits, the CODshowed the descending order of frozen squid(0.57mg/g), boiled fish paste(0.18mg/g), and pig-fatskin(0.10mg/g), and the case with frozen squid was the highest and the case of the pig-fat skin, lowest. Thetotal phosphorus, like the COD, showed the highest in frozen squid(0.02mg/g), and in case of the totalnitrogen, unlike the COD, the pig-fat skin was shown to be the highest(0.006mg/g).Key words : Octopus drift-line, Artificial bait, Practical use

Development of artificial bait for octopus drift line