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東北海区におけるサンマ魚群性状と漁況変動との関係
https://fra.repo.nii.ac.jp/records/2007250
https://fra.repo.nii.ac.jp/records/2007250c2c4eabd-f5eb-4578-986b-f49279c57d20
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2024-06-10 | |||||||||
| タイトル | ||||||||||
| タイトル | 東北海区におけるサンマ魚群性状と漁況変動との関係 | |||||||||
| 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 |
相沢, 幸雄
× 相沢, 幸雄
× 福島, 信一
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| 抄録 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | Fishermen distinguish six shoaling types of the Pacific saury, Cololabis saira, fished in the waters off Hokkaido and northeastern Honshu (Tohoku Region). These types are differentiated mainly by swimming behaviour. They include: nagashi-mure or moving shoal, shirami-mure or whitish shoal, soko-mure or sinking shoal, hane-mure or jumping shoal, bochi-mure or spotted shoal, and hamonomawashi or shoal attacked by predacious animals. The present authors defined these shoaling types, and examined frequencies of their occurrences during fishing seasons from 1947 to 1973. Statistically two shoaling types, nagashi-mure and shirami-mure, were most frequently observed during the 27 fishing seasons followed by hane-mure. The nagashi-mure dominated over the others during successful years in the 1950's when the fishing sites formed mainly in the coastal waters west of long. 145°E. When the amount of catch was decreasing in the early 1960's, the frequency of nagashi-mure also declined. Since then the shirami-mure dominated, coinciding with the decreasing catch, and the shift of the fishing grounds offshore beyond long. 145°E (Figures 2 and 3). The hane-mure appeared frequently during transitional period between the prosperous years of coastal operations and the adverse years of offshore operations. It is also noted that the within-season change in the ratio of nagashi-mure differed apparently depending upon fluctuations in the amount of catch. During 1950 through 1957 when the annual catch was on the increase, the ratio of nagashi-mure was low in the beginning of each fishing season increasing toward the end. On the other hand, the ratio lowered during seasons of 1962 to 1965 when the catch was declining. No remarkable change occurred during fishing seasons of 1958 to 1961 when the catch remained at a high level or of 1966 and there after when the amount of catch was continuously small (Figure 4). | |||||||||
| 言語 | en | |||||||||
| 抄録 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | 東北海区のサンマ魚群には発見時の特徴により,ナガシむれ·シラミむれ·ソコむれ·ハネむれ·ボチむれ·ハモノ廻しなどの名称がある.本報では先ず,これら各むれの規定を述べ,次いで1947~1973年のサンマ漁獲状況の資料により,各むれの出現割合の経年度変化とサンマ漁況·海況との関係を解析した.サンマ魚群の基本はナガシむれとシラミむれで,両群の長年の出現割合は相反し,1959年まではナガシむれが大半を占めシラミむれは少なかったが,1960年代に入るとナガシむれは急に減少し,1966~1971年にはシラミむれが大半を占めた.これら両群が入れ替った前後にはハネむれが高率の変動期が認められた.サンマ漁況は,ナガシむれが高率の年代には沿岸主漁場で漁獲水準は高かったが,親潮勢力中心部の離岸に伴う主漁場の沖合化と共にナガシむれが急減し漁獲は不安定となり,シラミむれが高率の年代には沖合主漁場で漁獲水準は最低となった.ナガシむれの出現割合は漁獲量の増大期には漁期後半に増加し,減少期には漁期後半に減少し,高·低位の安定期には漁期の前後で大差がない,また主漁場の沖合化に伴い例年10月中·下旬に集中出現するソコむれが急に増加した. | |||||||||
| 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 39, 号 tnf_k_39_1, p. 1-10, ページ数 10, 発行日 1978-03 |
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| 出版者 | ||||||||||
| 出版者 | 東北海区水産研究所 | |||||||||
| 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_39_1 | |||||||||
| 関連サイト | ||||||||||
| 識別子タイプ | URI | |||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010174055 | |||||||||
| 言語 | ja | |||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||
