@article{oai:nagasaki-u.repo.nii.ac.jp:00008532,
 author = {Matsushita, Yoshiki and Azuno, Toru},
 issue = {5},
 journal = {日本水産学会誌, NIPPON SUISAN GAKKAISHI},
 month = {Oct},
 note = {中型まき網漁業の灯船のスキャニングソナー画像を解析して，魚群反応の画素数から漁獲結果を予測する実験式を得た。この式を用いて集魚中の魚群に投網した場合に期待される漁獲量（期待漁獲量）を算出し，投網したときと投網しなかったときの期待漁獲量を比較したところ，期待漁獲量の増加とともに投網する確率が高くなった。漁労長は期待漁獲量が 1.5 トン以上の集魚で必ず投網し，50% の確率で投網を行う期待漁獲量は 1.3 トンであった。期待漁獲量が 1.3 トンと 1.5 トン以上の集魚回数はそれぞれ全体の 32% と 24% であった。, An empirical formula expressing the relationship between catch amount and number of pixels of the fish echo displayed in the scanning sonar prior to net shooting was obtained in the coastal purse seine fishery with fishing lights that targets Japanese anchovy Engraulis japonicus. By using this formula, we compared the expected catch amounts of fish abandoned at the end of the luring process with the expected catch amounts of fish at which the fishing master decided to shoot the net. The fishing master always decided to capture a school when the expected amount from the sonar display exceeded 1.5 tons. The probability of net shooting was expressed by a logistic function of expected catch amount. The net was shot at 50% probability when a catch of more than 1.3 tons was expected. The number of luring processes that satisfied the expected amount of over 1.5 tons accounted for only 24% of the total number of luring processes. Thus, the present style of fishing depends on many attempts to lure fish by 3 lighting boats. Cost-saving measures such as energy- and labor-saving technology should be considered to allow for fluctuations in the abundance of E. japonicus, steady increase of fuel prices, and shortage of labor that are expected in the future., 日本水産学会誌, 78(5), pp.878-884; 2012},
 pages = {878--884},
 title = {中型まき網漁業における集群量に基づく投網の意思決定},
 volume = {78},
 year = {2012}
}