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母船式鮪漁業の漁況に関する研究―8 : 西南太平洋におけるマグロ,カヂキ類の釣獲率について(1960年5月~8月)


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Title: 母船式鮪漁業の漁況に関する研究―8 : 西南太平洋におけるマグロ,カヂキ類の釣獲率について(1960年5月~8月)
Other Titles: Studies on the Fluctuation in Catch of the Tuna-fishing Fleet―VIII Variability of Hooked-Rates for Tunas and Marlins in the Western South Pacific Ocean during four months from May to August 1960
Authors: 古賀, 重行
Authors (alternative): Koga, Sigeyuki
Issue Date: 31-Aug-1961
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.11, pp.96-102; 1961
Abstract: Basing on the data gathered by 3 Tenyo-fishing fleet in the Western South Pacific Ocean are during four months from May to August 1960. The following charcters are shown in regard to the hooked-rate in this area. In regard to the hooked-rate of yellowfin tuna, it decreased according to fall on month, but in the case of albacore, this tendency are not distinct. Especially in the area of between 0°-10°S, the hooked-rate of yellowfin tuna are the most excellent in this area and it showed the tendency to decrease according to the fishing ground proceed to southward. North of 15°S. latitudinal ranges of the most productive areas are presented in the easterly fishing ground, but on the contrary, south of 15°S, latitudinal ranges of the most productive areas are presented in the westerly fishing ground. Except in the case of albacore, in the regions to the south and to the north of 20°S. this tendency was contrary. The hooked-rate of yellowfin tuna in 1960 are higher than that in 1959. Londitudinal changes of the hooked-rate of yellowfin tuna are clearly noticed in the Equatorial Pacific Ocean. Namely, the hooked-rate are the most excellent in this area and it showed the tendency to increased according to the fishing ground proceed to eastward. Annual hooked-rate of southern bluefin tuna had been not variable. But in the detailes, it seems that the hooked-rate in 1960 are lower values than that in the another years. It is recognize clearly that there is a remarkable difference of the hooked-rate of striped marlin according to the seasons. Especially, the hooked-rate of striped marlin in the spring season are lower than in any other season, but in the case of albacore, this tendency was contrary. From the above facts, the variance of the hooked-rate of fish depend on the seasonal migration. / 第3天洋船団操業を通じてみた西南太平洋の漁況について次の如き傾向が認められた. 1. 海区別釣獲率の変動 キハダ……O°~10°Sが最高の率を示し,それより南緯する程低下の傾向を示す.0°~15°S海区においては東経が高率を示し,15°S以南海区は西経が高率を示す. メバチ……経度別変化は明瞭な東高西低を示す. ビンナガ……20°S以北海区は西経が高率を示し,以南海区は東経が高率を示す. 2. 月別釣獲率の変化 キハダ……5月が最高の値を示して月を追うに従って低下の傾向を示す. ビンナガ……月別変化は明瞭でない. 3. 季節別変化 キハダ……前年度より上昇の傾向を示す.何れの季節においてもW'ly>E'lyで東方程高くなる傾向を示した. ビンナガ……20°~30°S海区において,春から夏にかけて上昇の傾向を示す.従つて不漁期より好漁期に向うものと思われる.20°~30°S間の経度別変化をみると18次船団時の25°~30°S海区を除いて何れの海区も東経が高率を示す. 濠洲マグロ……明瞭な季節変化は認められないが,前年度より低下傾向を示している. マカヂキ……顕著な季節変化が認められ,春から夏季にかけて低下する傾向を示す.この現象は魚群の季節的南北移動に起因するものと思われる.
URI: http://hdl.handle.net/10069/31692
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第11号

Citable URI : http://hdl.handle.net/10069/31692

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