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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Fisheries > Bulletin > Bulletin of the Faculty of Fisheries > 第11号 >

九州西方海域産小型歯鯨の研究―5 : 小型歯鯨類の食性について

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Title: 九州西方海域産小型歯鯨の研究―5 : 小型歯鯨類の食性について
Other Titles: Studies on the Little Toothed Whales in the West Sea Areas of Kyūsyū―V About the Food of the Little Toothed Whales
Authors: 堤, 俊夫 / 上村, 順一 / 水江, 一弘
Authors (alternative): Tsutsumi, Tosio / Kamimura, Zyuniti / Mizue, Kazuhiro
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.19-28; 1961
Abstract: 1) The food of Ragenorhynchus oblipuidens, Tursiops spp., Pseudorca sp. and Grampus griseus were investigated. They had deen caught in the West Sea Area of Kyusyu and at the coastal sea of Yamaguti Pref. 2) Their stomach contents were investigated at the location of catch about Tursiops spp., Pseudorca sp. and Grampus griseus, in consequence Tursiops spp. had taken squid chiefly or little fishes but Pseudorca sp. and Grampus griseus hab eaten squib only. 3) The bites were found on the squid and fish in their stomach, it seems that they take the living food by their teeth of both jaws and then swallow their food in the natural behavior. 4) These toothed whales were full stomach in winter investigation at the location of catch but in summer the most of them were empty stomach, it seems that this winter toothed whales are the catch in the feeding migration and summer are in the breeding migration. 5) The shoal of Pseudorca sp. in the feeding migration lives in company with the shoal of Tursiops sp., and in winter both species had been caught always together. But in the breeding migration both species do not live in company. 6) Ragenorhynchus oblipuidens, Tursiops spp. and Pseudorca sp. live in the large shoal, but the shoal of Gramps griseus is smaller than the others, especially that shoal at the breeding migration in summer has this tendency. 7) In calture these little toothed whales swallow the food from the head part in fish and the extreme part of the mantle in squid. 8) In calture Ragenorhynchus oblipuidens takes jack mackerel only. 9) In calture Tursiops spp. take jack mackerel and mackerel mainly and little squid, it seems that this species takes jack mackerel, mackerel and squid in nature considering the investigations and cultures. 10) Pseudorca sp. likes jack mackerel and mackerel than squid. The natural food of this species is same to that of Tursiops spp. as this species lives in company with Tursiops spp. 11) In calture Grampus griseus takes squid only. 12) In Grampus griseus, Tursiops sp. and Ragenohynchus oblipuidens in culture the most part of the death was owing to the stoppage of stomach by the unusual object. 13) About the daily food quantity in culture, Ragenorhynchus obliquidens takes 10% of their body weight. 14) In culture one animal of Pseudorca sp. (mean pody length-about 330cm.) takes 12.2Kg. in every bay, and Tursiops sp. (mean body length-about 250cm.) is about 10Kg., but the quantity of food in this cases had been restricted to some extent. 15) The food quantity of Ragenorhynchus oblipuidens, Tursiops spp. and Pseudorca sp. is little in summer but it increases with the decrease of water temperature and it shows the highest in January and February. 16) In culture the daily food quantity of one animal of Grampus griseus (mean body length―260cm.) is 13.4Kg. when the food had been given to them unrestrictedly, and the change of the food quantity by monthes is not recognized like in others pecies.
URI: http://hdl.handle.net/10069/31685
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第11号

Citable URI : http://hdl.handle.net/10069/31685

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