WEKO3
アイテム
サンマの食性について
https://fra.repo.nii.ac.jp/records/2007245
https://fra.repo.nii.ac.jp/records/200724522297f89-4b00-4c16-b336-4d067c1f3c97
| アイテムタイプ | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||
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| 公開日 | 2024-06-10 | |||||||||||
| タイトル | ||||||||||||
| タイトル | サンマの食性について | |||||||||||
| 言語 | ja | |||||||||||
| 言語 | ||||||||||||
| 言語 | jpn | |||||||||||
| 資源タイプ | ||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||
| アクセス権 | ||||||||||||
| アクセス権 | metadata only access | |||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||||||||
| 著者 |
小達, 和子
× 小達, 和子
WEKO
3567
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | Extensive fishing activities and related researches in the northwestern Pacific provide opportunities to investigate the ecology of the Pacific saury. The present study is based on contents of the anterior part of intenstine (simply called "intestine contents" hereafter) of juveniles and immature fish taken by high speed nets during the northward migration phase in June 1972, and of adults caught by research and commercial vessels in the 1975 and 1976 fishing seasons( southward migration phase). During these periods the research vessels also collected zooplankton with the marutoku-type nets. These data, together with previous reports, provided the opportunity to work out the feeding behavior and prey species of the Pacific saury at different developmental stages. The saury contained more zooplankton, in terms of volume, when the fish were taken in the northern waters of Oyashio Current than in the transition area. But number of species was larger in the southern specimens than in the northern ones. The geographical difference of species reflects, to some extent, amount and species composition of zooplankton collected by marutoku-type nets. Geographical difference of amount of intestine contents is rather remarkable for adult fish taken in the feeding and early southward-migration phases. The fish from the northern waters contained large amounts of food materials including such borealic species as Calanus plumchrus, C. cristatus, Euphausia pacifica, Themisto sp. etc. On the other hand fishes from the waters adjacent to Japan took less food plankton of various species inclusive of Oncaea sp., Corycaeus sp., Centropages sp., Oithona sp., Acrocalanus sp., Candacia sp. etc. It is also interesting to note that saury aggregate in the area of high concentration of plankton during the northward-migration phase, but such coincidence of distribution between saury and plankton disappears during the southward-migration phase. This fact implies change of major factors determining distribution of saury from feeding during the northward-migration phase to some other factor, possibly higher temperature for maturation and spawning, during the southward-migration phase. The saury appear to begin feeding at sunset. The intestine of fish taken toward mid-night were mostly full of food materials. Individuals without food in the anterior part of intestine increased in number after midnight. As saury grow longer they take in more prey species. Only four or five species of micro-copepoda were found in the intestines of larvae less than 25 mm in body length. Number of prey species increased to about ten at the juvenile stage, and 20 at the young and immature stages. The adults appear to take various species, not strictly selecting one from other. | |||||||||||
| 言語 | en | |||||||||||
| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | 1972年6月実施した北上期のサンマ調査の際,高速ネットで採捕した幼魚·未成魚及び1975,1976年,調査船並びに漁船によって採捕した漁期中の成魚について,腸管内容物の湿重量·種類組成を調査し,同時にOネットで採集したサンマの分布水域における環境プランクトンとの関係を検討した.また既に報告した稚仔期のサンマの餌種類と合せて,各発育段階に対応した餌種類の変化を明らかにした.1. サンマの腸管内容物出現種類は,特ネットで採集した棲息環境における動物プランクトン組成に対応して,北方沖合では単純であるが,近海~沿岸水域では種類数が多い。2. 北方索餌水域及び南下回遊初期における成魚の摂餌量は沖合と沿岸とで異なり沖合の群の方が摂餌量が多く,冷水性の Calanus plumchrus, Calanus cristatus, Euphausia pacifica, Themisto sp. 等が卓越しているが,沿岸水域では量が少なく,Oncaea sp., Corycaeus sp., Centropages sp., Oithona sp.,Acrocalanus sp.,Candacia sp. 等の多数種が摂餌されている.3. サンマの摂餌時間帯はタ刻以降に多く夜半までは飽食状態であるが,夜半以後は腸管前部に内容物なしの状態が増加する.4. サンマは発育に伴なって餌料対象種が多様化し,また,棲息水域の差によって腸管内容出現種に特徴が見られる.仔魚期には4,5種類の micro Copepodaを摂餌していたのが,稚魚期には約10種,幼魚期及び未成魚には20種位に増加する.成魚期になると対象種は更に多様化する. | |||||||||||
| 言語 | ja | |||||||||||
| 書誌情報 |
ja : 東北区水産研究所研究報告 en : Bulletin of Tohoku Regional Fisheries Research Laboratory 巻 38, p. 75-88, ページ数 14, 発行日 1977-11-30 |
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| 出版者 | ||||||||||||
| 出版者 | 東北区水産研究所 | |||||||||||
| 言語 | ja | |||||||||||
| 出版者 | ||||||||||||
| 出版者 | Tohoku Regional Fisheries Research Laboratory | |||||||||||
| 言語 | en | |||||||||||
| ISSN | ||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||
| 収録物識別子 | 0049-402X | |||||||||||
| 書誌レコードID | ||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||
| 収録物識別子 | AN00167637 | |||||||||||
| 情報源 | ||||||||||||
| 識別子タイプ | Local | |||||||||||
| 関連識別子 | tnf_k_38_75 | |||||||||||
| 関連サイト | ||||||||||||
| 識別子タイプ | URI | |||||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010170642 | |||||||||||
| 言語 | ja | |||||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||||
