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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―3 : 西南太平洋特にフイジー海域における鮪類の胃の内容物に就て

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Title: 母船式鮪漁業の漁況に関する研究―3 : 西南太平洋特にフイジー海域における鮪類の胃の内容物に就て
Other Titles: Studies on the Fluctuation in Catch of the Tuna-fishing Fleet―III On the Stomach Contents of Tuna in the western South Pacific Ocean, especially 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.10-17; 1960
Abstract: Examining the stomach contents of the yellwfin and the bigeye tunas obtained in the western part of South Pacific Ocean for about thirty days, October 1958, and the following results were obtained; (1) In the Fiji area, there occured many fish having rather empty stomach than in the other area, therefore, this area seems to be poor in food organisms. (2) Food organisms found in the stomach amounted to about 27 kind (c.f. Table 4), being remarkably poor than in the equatorial region. Among them, Alepisaurids, Carangids, Lepidotids, Paralepids, Ostraciontids, Balistids, Cephalopods and Macruran shrimps occupied more than 10%, respectively. These are probably the most important as prey of tunas in the Fiji area. (3) Coelenterates were rather abundant in the Fiji area than in the region to the north of 20°S. (4) There differences of food-habit among both fish in respects of certain kind of preys. Several deep sea fish, such as Paralepids and Alepisaurids, occured in the bigeye tuna at higher frequency than in the yellowfin tuna. Others, such as Chiasmodontids and Sternoptychids occured in the bigeye tuna, being absent in the yellowfin tuna. Several surface sea fish, such as Carangids, Scombrids, Clupeids and Ostraciontids, on the contrary, were found more abundant in the yellowfin tuna than the bigeye tuna. Others, such as Balistids, Molids, Coryphaenids and the youngs of Katsuwonids were not seen in the bigeye tuna. From the mentioned above, it will be presumed that the bigeye tuna may be essentially the resident in slightly deeper layer compared with the yellowfin tuna. / フイジー海域におけるマグロ類の胃内容物の特徴として下記の傾向が認められた. 1. 赤道から南北にへだたる程,空胃が多くなる.従って,この海域はマグロ類にとって餌料となるべき生物の量が少ないものと考えられる. 2. 本海域に見られた餌料生物は約27種で,赤道海域より種類が顕著に少ない.そのうち,10%以上の高い出現率を示したpreyはミズウオ科・アジ科・シマガツオ科・ハダカエソ科・モンガラカワハギ科・ハコフグ科の魚類6種とイカ類・エビ類で,本海域の鮪類の餌料として重要な占めるものと思われる. 3. クラゲ類は他の海域より高い出現率を示した. 4. 数種の餌料について,キハダとメバチにかなり顕著な食性の相異が認められた.深海性のハダカエソ科・ミズウオ科はメバチにその出現割合が大きい.深海性のムネエソ科・クロバウズギス科はメバチに出現し,キハダではその出現を見なかった.表層性のモンガラカワハギ科・マンボ科・シイラ科及びカツオ若年魚はキハダには見られ,メバチには出現を見なかった.又,表層性のアジ科・サバ科・イワシ科・ハコフグ科がキハダにその出現割合が大きい.以上の傾向から,メバチの棲息分布はキハダより深い層にあるということが考えられる.
URI: http://hdl.handle.net/10069/31781
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第9号

Citable URI : http://hdl.handle.net/10069/31781

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