@article{oai:nagasaki-u.repo.nii.ac.jp:00009751,
 author = {西田, 英明 and 高山, 久明 and 柴田, 恵司},
 journal = {長崎大学水産学部研究報告, Bulletin of the Faculty of Fisheries, Nagasaki University},
 month = {Feb},
 note = {A series of echo-survey was made in the Western Tropical Pacific, 3°-7° N, 138°-151°E, in November 1982 on board the R/V kakuyo-Maru (1044 G/T) of Nagasaki University. By means of a shiphorne echo-sounder of 38 kHz, many interesting fish traces were recorded, when the vessel was crossing just above boiling fish shoals at a speed of 9 knots. At that time, the fish was observed from deck to be skipjacks of about 80 m in total length. Some acoustic and statistic considerations were taken on 23 clear echo traces from individual skipjacks among the above mentioned, i.e., 6 inverse V shape traces from stationary fish and 17 oblique and dotted traces from fish diving to deeper. The results were: i) on the stationary fish traces, a detectable angular range of the echosounder was determined as 6.5° in maximum for a skipjack of 80 cm long at a depth of 0-230 m of water and ii) from 17 fish traces shown active diving, their swimming speeds were estimated as 1.9 or 4.5 m/sec mean in 40-85 m layer of water., 本考察の結果,鶴洋丸の魚探EK-38Sでは,全長80cmのカツオを最大6.5°の角範囲で探知できることが判った.また,カツオの魚群は本船が接近したとき深層に急速移動したが,このときのカツオの平均遊泳速力は1.9,または4.5m/secであり,その鉛直成分は1.4m/sec,水平成分は4.3m/secと試算された., 長崎大学水産学部研究報告, v.55, pp.19-24; 1984},
 pages = {19--24},
 title = {魚探記録の解析-9 :　西太平洋赤道域で観察したカツオの遊泳速力},
 volume = {55},
 year = {1984}
}