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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Fisheries > Bulletin > Bulletin of the Faculty of Fisheries > 第9号 >

母船式鮪漁業の漁況に関する研究―2 : フイジー海域に於けるビンナガマグロとマカジキの緯度別釣獲率の変化に就て


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Title: 母船式鮪漁業の漁況に関する研究―2 : フイジー海域に於けるビンナガマグロとマカジキの緯度別釣獲率の変化に就て
Other Titles: Studies on the Fluctuation in Catch of the Tuna-fishing Fleet―II On the Latitudinal Change of the Hooked-rate of the Albacore and the Striped Marlin in the Fiji Area
Authors: 古賀, 重行
Authors (alternative): Koga, Sigeyuki
Issue Date: 31-Jul-1960
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.9, pp.1-9; 1960
Abstract: This study is based on the data of fishing conditions collected from the Koyo tunafishing fleet in the Fiji area during three months from September to November 1958, the following results are presumed as to the distribution of the albacore and the striped marlin. 1. In the Fiji area, the former are abundant to the south of 25°S and the latter do between 18°S and 19°S, respectively. 2. The latitudinal change of the hooked-rate of the both fish depend on the seasonal migration. 3. In the regions to the south and to the north of 25°S respectively, tunas have a different biotop and the same is able to say also for the region to the north of 28°S. 4. In the Fiji area where were intense fishing effort as the fleet the followings were seen in each fishing ground;- (1) The hooked-rate at opening of the season was higher than that of the end. (2) The peak of hooked-rate was appwared few days after of hook-number. (3) The hooked-rate, after the suspension of fishing, was higher than the before. 5. The change of the hooked-rate of albacore in this area seemed to relate with the moon age, for instance, the hooked-rate at the spring tide being highest. 6. So far as in the range of optimum temperature, as seen in Table 4, the lower temperature we met the more abundant fish we get. / 広洋船団操業より見たフイジー海域の漁況に就て次の如き傾向が認められた. (1) 9月~11月の期間内で,ビンナガマグロは25°S以南に,マカジキは18°S~20°S海域に最も濃密に分布している. (2) ビンナガマグロ及びマカジキの緯度による釣獲率の変化は,魚群の季節的南北移動によるものと思われる. (3) 25°Sと28°Sにおいて,それぞれの以北と以南の海区は,鮪類にとって異る生活圏を構成しているものと思われる.
URI: http://hdl.handle.net/10069/31780
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第9号

Citable URI : http://hdl.handle.net/10069/31780

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