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豊後水道域における魚群分布
https://fra.repo.nii.ac.jp/records/2003289
https://fra.repo.nii.ac.jp/records/200328926c4a16c-e5f1-4fb7-bd62-3de9247759da
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2024-04-25 | |||||
| タイトル | ||||||
| タイトル | 豊後水道域における魚群分布 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Distribution of Fish Schools in the Bungo Suido (Channel) Determined by Acoustic Surveys. | |||||
| 言語 | en | |||||
| 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 |
花岡, 藤雄
× 花岡, 藤雄 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The Bungo Suido is one of the two major channels connecting the Seto Inland Sea to the Pacific Ocean. It comprises migratory and drifting routes of commercially important fishes, and their eggs, larvae and juveniles. In order to understand the behavior of fish schools, acoustic surveys were conducted employing four research vessels equiped with echo sounders for commercial fishing operation in March 1972. The four vessels cruised along eight lines set so as to cover the channel. The echo sounders recorded dense accumlation of fish schools in boundary areas between the inland sea water and the offshore water identified as such by the salinity of or below 34.5‰ at 30m depth layer in the month when the southward movement of inland sea water prevailed. The vertical profiles of acoustic record showed that the fish avoided the inflowing offshore water of relatively high temperature above 18°C. Shape of the records indicates that anchovy, Engralulis japonica (HOUTTUYN), and trigger fish, Navodon modestus (GuNTHER), represented major components of the fish schools discovered therein. Similar acoustic surveys were repeated in the same area in September 1972, when the southward flows were weakend the immigrant fishes from the open sea aggregated therein. At this occasion, the vessels covered five blocks instead of lines. The fish were found densely distributed in the inland sea water and in the coastal water again represented by 34‰ of salinity at 30m depth layer. Analyses of records implied that dominant species were anchovy, round herring, Etrumeus teres (DEKAY), mackerels, Scomber japonica HOUTTUYN, and S.australasicus CUVIER, and trigger fish. The fish appeared aggregating again in the relatively cold coastal water below 24℃. At the both occasions, the fish schools in densely distributed areas were found not only large in size but also narrow in distance between them. The tidal current were found affecting distribution of fish which decreased in the swift flow of about four knots in narrow strait. | |||||
| 言語 | en | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 1972年3月及び9月に魚群探知機を用いて,豊後水道域における魚群の分布及び潮流による影響について調査した。その結果を要約すると次の通りである。魚群は,内海系水の南下が強い3月には内海系水と外洋系水との境界付近に多い。内海系水の南下が弱く,外海域から来遊した魚群が多く滞留している9月には,境界域等に局部的な集群をする傾向はみられない。鉛直分布をみると,鉛直混合の盛んな場所で深い傾向がみられる。9月には水温25℃以上のところには全く出現せず,22-23℃のところに多く分布する。群れの大きさは,3月には内海系水と外洋系水との境界域で大きい。9月には外洋系水の影響が強い水道南部域で大きい。群れ間の距離の計測結果から,沿岸域では密に,沖合域では粗に分布する傾向がみられた。潮流が魚群の分布に与える影響をみると,潮流の速い水道北部の速吸瀬戸付近で,憩流後南流が4ノット前後になると魚群は急激な減少を示した。 | |||||
| 言語 | ja | |||||
| 書誌情報 |
ja : 南西海区水産研究所研究報告 en : Bulletin of the Nansei Regional Fisheries Research Laboratory 巻 15, p. 13-27, ページ数 15, 発行日 1983-03 |
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| 出版者 | ||||||
| 出版者 | 南西海区水産研究所 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | Nansei Regional Fisheries Research Laboratory | |||||
| 言語 | en | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0388-841X | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00181988 | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | nnf_k_15_13 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010271218 | |||||
| 言語 | ja | |||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||
