冬季の北太平洋亜寒帯水域にさけ・ます類の餌は豊富にあるのか?

遠洋水産研究所研究報告 Volume 36 Page 69-75 published_at 1999-03
アクセス数 : 662
ダウンロード数 : 112

今月のアクセス数 : 0
今月のダウンロード数 : 1
File
BullNatResInstFarSeasFish_36_69.pdf 512 KB 種類 : fulltext
Title ( jpn )
冬季の北太平洋亜寒帯水域にさけ・ます類の餌は豊富にあるのか?
Title ( eng )
Is There Abundant Zooplankton Prey for Salmonids in the Subarctic North Pacific in Winter?
Creator
Source Title
遠洋水産研究所研究報告
Volume 36
Start Page 69
End Page 75
Abstract
Macrozooplankton was sampled using a North Pacific standard plankton net during two trans-Pacific cruises of the R/V Kaiyo maru at 27 and 23 stations in a wide area of the northern North Pacific Ocean in November-December 1992 and January 1996, respectively. In all of the western and central North Pacific and Gulf of Alaska, the macrozooplankton biomass in these winter months was much lower than that in summer months. Salmonids (Oncorhynchus spp.) were captured in waters with low sea surface temperatures (<8 °C), where the macrozooplankton biomass remained quite low as well. The salmonids may have a survival strategy to stay in cold waters in order to reduce their energetic consumption, because macrozooplankton as prey is not abundantly available in winter. The cold-water environment appears to be advantageous to the survival of offshore salmonids overwintering under poor food conditions.
Keywords
macrozooplankton biomass
subarctic North Pacific Ocean
salmonids
ocean distribution
survival strategy
寒冷地
サケ科
太平洋
餌料
戦略
生存
NDC
Zoology [ 480 ]
Language
jpn
Resource Type journal article
Publisher
遠洋水産研究所
Date of Issued 1999-03
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0386-7285
[NCID] AN00025949
[URI] http://rms1.agsearch.agropedia.affrc.go.jp/contents/library/jnr/enyo.html isVersionOf