@article{oai:ir.kagoshima-u.ac.jp:00010785,
 author = {西, 徹},
 journal = {鹿児島大学水産学部紀要=Memoirs of Faculty of Fisheries Kagoshima University},
 month = {2016-10-31},
 note = {22 comparative examinations on hook ratio of tuna long line with an artificial lure of vinyl chloride shaped like squid were carried out in the eastern part of the Indian Ocean during the terms from 17th to 28th of May and from 16th to 25th of June in 1979, on board the "Kagoshima-Maru" (G. T. 1038 Tons), fishing training-ship of the Faculty of Fisheries, Kagoshima University.
The following results were obtained.
1) Three kinds of lure were used. The hook ratio for K-30B was 0.52% and those for K-100B and M-30B were both 0.48%. The hook ratio variance of three lures were tested statistically, and there was no significant difference at the 5% significant level.
2) Each hook ratio of lure putting together three attaching methods was K-30B: 0.55%, K-100B: 0.52%, M-30B: 0.52%, showing no significant difference at the 5% significance level.
In comparing the hook ratios in two experimental periods (the first period and the second period), in case of K-30B (with transparent abdomen), the hook ratio of the former was 0.6%, that of the latter was 0.5%. In case of K-100B (with pink abdomen), the hook ratio of the
former was 0.82%, that of the latter was 0.2%. In case of M-30B (with white abdomen), the
hook ratio of the former was 0.91%, that of the latter was 0.1%.
3) The hook ratio of artificial lure with saury was equal to or better than that of artificial lure. The hook ratio of the latter was only 60% of that of the former, but the difference was not
statistically significant.
4) The total hook ratio of the artificial lure included three attaching methods was 0.53% which was only one fifth of that of saury 2.73%. The percentage of hook ratio of the artificial
lure to saury bait was 23.35% in the first period of the investigation and became 14.27% in the second period. 5) The hook ratio of the section in which 20-60 lure baskets were set consecutively was 0.63%,
and that of the section of 20-60 saury baskets contiguous to the lure baskets was 1.38%. This reveals that the hook ratio of the former is superior even when the lure baskets were set consecutively.
6) Very few sharks and fishes of no commercial value were captured with the artificial lure., 昭和54年5・6月インド洋東部漁場において,3種類の塩化ビニール製擬餌イカを用いて,22回のマグロ延縄釣獲比較試験操業を実施し,次の結果を得た。1. サンマ切身や集魚剤を無装着の擬餌のみの種類別釣獲率はK-30Bでは0.52%,K-100BおよびM-30Bではともに0.48%となった。F検定を用いて擬餌別釣獲率の差が有意であるか否かを検定したら5%有意水準で擬餌別釣獲率に差は認められない。2. 3種類の装着法を総合した擬餌の種類別釣獲率はK-30B: 0.55%,K-100B: 0.52%,M-30B: 0.52%となり,擬餌の種類による釣獲率の平均値に差は認められなかった。操業回数を前半と後半に2分して釣獲率を比較すると,擬餌の腹部の透明なK-30Bは0.6%と0.5%,腹部桃色のK-100Bでは0.82%と0.2%,腹部白色のM-30Bでは0.91%と0.1%となり,K-100BとM-30Bでは後半の操業で釣獲率は極端に低下した。3. 擬餌のみとサンマ切身付擬餌の釣獲率を比較すると,切身付擬餌の釣獲率は擬餌のみの釣獲率に比べ,同等かそれ以上で,両者の比率をみると,前者は後者の60%になった。4. 集魚剤付擬餌には2尾の釣獲しかなかった。集魚剤に付着させる油脂の撰択,集魚剤の作用時間を持続させる工夫,擬餌への装着方法等を改良すれば釣獲が上がると考えられる。5. 3種類の装着法を総合した擬餌とサンマ餌料の釣獲率を比較すると,擬餌の総釣獲率は0.53%,対照区間内のサンマ餌料のそれは2.73%となり,擬餌の釣獲率はサンマ餌料の釣獲率の約1/5と劣る結果となった。6. 長区間連続装着した擬餌のみとサンマ餌料との釣獲率を比較したら,前者の釣獲率は0.63%,後者のそれは1.38%となり,擬餌を連続装着した場合でもかなりの釣獲がある事がわかった。7. 雑魚類,特にサメ類は擬餌による釣獲は極めて少なかった。},
 pages = {135--154},
 title = {マグロ延縄用擬餌による釣獲試験 I : 軟質塩化ビニール製擬餌イカ},
 volume = {30},
 year = {}
}