{"created":"2024-06-19T05:41:42.690529+00:00","id":2007974,"links":{},"metadata":{"_buckets":{"deposit":"2ddae02e-d345-4a86-8ba2-d35e8ad53e1e"},"_deposit":{"created_by":10,"id":"2007974","owners":[10],"pid":{"revision_id":0,"type":"depid","value":"2007974"},"status":"published"},"_oai":{"id":"oai:fra.repo.nii.ac.jp:02007974","sets":["12:14:1716955731445"]},"author_link":["1906","3508","2001"],"control_number":"2007974","item_10002_biblio_info_7":{"attribute_name":"bibliographic_information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1983-03","bibliographicIssueDateType":"Issued"},"bibliographicNumberOfPages":"22","bibliographicPageEnd":"94","bibliographicPageStart":"73","bibliographicVolumeNumber":"4","bibliographic_titles":[{"bibliographic_title":"水産工学研究所技報. 漁船工学","bibliographic_titleLang":"ja"},{"bibliographic_title":"Technical report of National Research Institute of Fisheries Engineering. Fishing boat and instrument","bibliographic_titleLang":"en"}]}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"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.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"水産工学研究所","subitem_publisher_language":"ja"},{"subitem_publisher":"National Research Institute of Fisheries Engineering","subitem_publisher_language":"en"}]},"item_10002_radio_30":{"attribute_name":"item_10002_radio_30","attribute_value_mlt":[{"subitem_radio_item":"吉田","subitem_radio_language":"ja"}]},"item_10002_relation_16":{"attribute_name":"情報源","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"nrife_gk_4_73","subitem_relation_type_select":"Local"}}]},"item_10002_relation_17":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_language":"ja","subitem_relation_name_text":"日本農学文献記事索引(agriknowledge)"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://agriknowledge.affrc.go.jp/RN/2010303912","subitem_relation_type_select":"URI"}}]},"item_10002_source_id_11":{"attribute_name":"item_10002_source_id_11","attribute_value_mlt":[{"subitem_source_identifier":"AN0035205X","subitem_source_identifier_type":"NCID"}]},"item_10002_source_id_9":{"attribute_name":"item_10002_source_id_9","attribute_value_mlt":[{"subitem_source_identifier":"0388-970X","subitem_source_identifier_type":"PISSN"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Ishii, Ken","creatorNameLang":"en","creatorNameType":"Organizational"},{"creatorName":"石井, 憲","creatorNameLang":"ja","creatorNameType":"Organizational"},{"creatorName":"イシイ, ケン","creatorNameLang":"ja-Kana","creatorNameType":"Organizational"}],"familyNames":[{"familyName":"Ishii","familyNameLang":"en"},{"familyName":"石井","familyNameLang":"ja"},{"familyName":"イシイ","familyNameLang":"ja-Kana"}],"givenNames":[{"givenName":"Ken","givenNameLang":"en"},{"givenName":"憲","givenNameLang":"ja"},{"givenName":"ケン","givenNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"1906","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"40372081","nameIdentifierScheme":"e-Rad_Researcher","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=40372081"}]},{"creatorNames":[{"creatorName":"Furusawa, Masahiko","creatorNameLang":"en","creatorNameType":"Organizational"},{"creatorName":"古沢, 昌彦","creatorNameLang":"ja","creatorNameType":"Organizational"},{"creatorName":"フルサワ, マサヒコ","creatorNameLang":"ja-Kana","creatorNameType":"Organizational"}],"familyNames":[{"familyName":"Furusawa","familyNameLang":"en"},{"familyName":"古沢","familyNameLang":"ja"},{"familyName":"フルサワ","familyNameLang":"ja-Kana"}],"givenNames":[{"givenName":"Masahiko","givenNameLang":"en"},{"givenName":"昌彦","givenNameLang":"ja"},{"givenName":"マサヒコ","givenNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"3508","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Miyanohana, Yoichi","creatorNameLang":"en","creatorNameType":"Organizational"},{"creatorName":"宮野鼻, 洋一","creatorNameLang":"ja","creatorNameType":"Organizational"},{"creatorName":"ミヤノハナ, ヨウイチ","creatorNameLang":"ja-Kana","creatorNameType":"Organizational"}],"familyNames":[{"familyName":"Miyanohana","familyNameLang":"en"},{"familyName":"宮野鼻","familyNameLang":"ja"},{"familyName":"ミヤノハナ","familyNameLang":"ja-Kana"}],"givenNames":[{"givenName":"Yoichi","givenNameLang":"en"},{"givenName":"洋一","givenNameLang":"ja"},{"givenName":"ヨウイチ","givenNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"2001","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"70392909","nameIdentifierScheme":"e-Rad_Researcher","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=70392909"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"item_resource_type","attribute_value_mlt":[{"resourcetype":"article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"魚群減衰係数の測定","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"魚群減衰係数の測定","subitem_title_language":"ja"},{"subitem_title":"Measurements of Attenuation of Sound by Schooling Fish","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"10","path":["1716955731445"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2024-06-19"},"publish_date":"2024-06-19","publish_status":"0","recid":"2007974","relation_version_is_last":true,"title":["魚群減衰係数の測定"],"weko_creator_id":"10","weko_shared_id":-1},"updated":"2025-06-12T08:11:43.984997+00:00"}