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魚群減衰係数の測定
https://fra.repo.nii.ac.jp/records/2007974
https://fra.repo.nii.ac.jp/records/2007974581bfafc-b0d0-4b69-811a-1db69e0f091f
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2024-06-19 | |||||
| タイトル | ||||||
| タイトル | 魚群減衰係数の測定 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Measurements of Attenuation of Sound by Schooling Fish | |||||
| 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 | article | |||||
| 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 |
石井, 憲
× 石井, 憲× 古沢, 昌彦× 宮野鼻, 洋一 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The direct meaturement on the attenuation of sound by schooling fish using two hydrophones was performed. A device named programmable multi-frequency transmitter-receiver transmitts the ultrasonic pulses, receives the direct wave and the attenuated wave and prints out their amplitudes. Carrier frequency are selected at 25, 50, 100, and 200 kHz. During the attenuation measurement the distribution range and situation of schooling fish were monitored by the volume measuring faculty of fish abundance estimation system. Measurements were made in culture nets several times and we succeeded in obtaining the reliable data for two-year old yellowtail. The mean fish-school attenuation coefficient of two-year-old yellowtail αf increases gradually with the frequency. The mean extinction cross-sections σe were computed to study the dependence of αf, upon the distribution density. Further, the length and weight normalized mean extinction cross-sections σwL, σew were compared with the several data reported by other authors. Present data may be useful for the more precise measurement in fish stock assesment. The detail of αf, σeL, σeW is described in this paper. | |||||
| 言語 | en | |||||
| bibliographic_information |
ja : 水産工学研究所技報. 漁船工学 en : Technical report of National Research Institute of Fisheries Engineering. Fishing boat and instrument 巻 4, p. 73-94, ページ数 22, 発行日 1983-03 |
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| 出版者 | ||||||
| 出版者 | 水産工学研究所 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | National Research Institute of Fisheries Engineering | |||||
| 言語 | en | |||||
| item_10002_source_id_9 | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0388-970X | |||||
| item_10002_source_id_11 | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN0035205X | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | nrife_gk_4_73 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010303912 | |||||
| 言語 | ja | |||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||
