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コホート解析によるマサバ太平洋系群の資源量推定
https://fra.repo.nii.ac.jp/records/2005278
https://fra.repo.nii.ac.jp/records/2005278381f9f5e-e075-4b09-afff-150fa4fa8562
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2024-05-22 | |||||
| タイトル | ||||||
| タイトル | コホート解析によるマサバ太平洋系群の資源量推定 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Estimation of the Population Size of the Pacific Mackerel by the Cohort Analysis | |||||
| 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 |
本間, 操
× 本間, 操× 佐藤, 祐二× 宇佐美, 修造 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The population size of the Pacific mackeral from 1961 to 1984 seasons was calculated by the cohort analysis, and the result was compared with the estimate by the spawning survey method. In consideration of the seasonal change of fishing grounds, the two semesters, January to June and July to December, were used as the unit time period for the natural and fishing mortality coefficients. The natural mortality coefficient was assumed to be uniformly, 0.4. The terminal fishing mortality coefficients of 0. 26 for the cohorts up to1972 and 0. 70 after 1972, were input. The fishing mortality coefficients were obtained through average survival rates estimated from the age composition of 5-year old fish and older. These fish were assumed to have completed recruitment to the fishery. The 1961, 1964, 1970 and 1976 year classes appeared as the dominant year class. Recently, the population size of the Pacific mackerel has been at an exceptionally low level, with about 3 billion fish at age one. The adult population also decreased to 2.3 billion fish in 1984. There was a considerable difference between estimates of the adult population size calculated from the cohort analysis and from the spawning survey method. It seemed that this difference was due to underestimation by the spawning survey method and re-examination of the overall amount of eggs was required to make this point clear. | |||||
| 言語 | en | |||||
| 書誌情報 |
ja : 東海区水産研究所研究報告 en : Bulletin of Tokai Regional Fisheries Research Laboratory 巻 121, p. 1-11, ページ数 11, 発行日 1987-02-25 |
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| 出版者 | ||||||
| 出版者 | 東海区水産研究所 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | Tokai Regional Fisheries Research Laboratory | |||||
| 言語 | en | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0040-8859 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00156834 | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | tokai_k_121_1 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010361996 | |||||
| 言語 | ja | |||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||
