{"created":"2024-10-03T01:13:50.107994+00:00","id":2010770,"links":{},"metadata":{"_buckets":{"deposit":"a3707db3-41f8-467e-bab6-2d3fc41538a2"},"_deposit":{"created_by":10,"id":"2010770","owners":[10],"pid":{"revision_id":0,"type":"depid","value":"2010770"},"status":"published"},"_oai":{"id":"oai:fra.repo.nii.ac.jp:02010770","sets":["1:8:1724312491438"]},"author_link":["517"],"item_10002_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2002-02","bibliographicIssueDateType":"Issued"},"bibliographicNumberOfPages":"76","bibliographicPageEnd":"122","bibliographicPageStart":"47","bibliographicVolumeNumber":"2","bibliographic_titles":[{"bibliographic_title":"水産総合研究センター研究報告","bibliographic_titleLang":"ja"},{"bibliographic_title":"Bulletin of  Fisheries Research Agency","bibliographic_titleLang":"en"}]}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Fish target strength is very important as a scale factor to estimate fish abundance from echo integration results in an acoustic survey, as information to estimate fish length and species, and as a parameter to design echo sounders. In Chapter 2, several methods of target strength estimation are enumerated and the principal of fish length estimation method is presented. This chapter is the starting point of the following chapters. In Chapter 3, the precise fish target strength pattern measurement system is developed in a tank. Both the preciseness and accuracy of this system are confirmed by the comparison between the target strength pattern measurements of the artificial targets and their exact theoretical calculations. The dorsal target strengths of five species are measured in this system and the precise target strengths available for the abundance estimation are shown. In Chapter 4, the validity of the theoretical calculations based on the deformed cylinder model is confirmed. The model calculations based on the swimbladder shape obtained by a conventional soft X-ray system or a computed tomography imaging system agree well with the measurements. In Chapter 5, the indexes for the preciseness of the target strength measurement in situ are proposed and the validity of these indexes is confirmed by measurements and computer simulations. In Chapter 6, the estimation method of fish length and behavior is developed by combining the split-beam method with the echo trace analysis method. The validity of this method is confirmed by the computer simulation and the measurements in a tank and at sea. The effect of the motion of the transducer at sea is considered using a computer simulation. In the last chapter, Chapter 7, a software for the analysis of the target strength is developed. It can analyze the target strength in situ with the proposed indexes and can estimate individual fish length and behavior, seeing the echograms and selecting the arbitrary area. The actual data obtained at sea is used and the estimation results by this software agree well to the fishing results. This paper is a slightly modified version of the doctoral dissertation proposed to Tokyo University of Fisheries.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"水産総合研究センター","subitem_publisher_language":"ja"}]},"item_10002_relation_16":{"attribute_name":"情報源","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"fra_k_2_47","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_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/2010651111","subitem_relation_type_select":"URI"}}]},"item_10002_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA11589591","subitem_source_identifier_type":"NCID"}]},"item_10002_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1346-9894","subitem_source_identifier_type":"PISSN"}]},"item_10002_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNameIdentifiers":[],"affiliationNames":[{"affiliationName":"","affiliationNameLang":"ja"}]}],"creatorNames":[{"creatorName":"Sawada, Koichi","creatorNameLang":"en"},{"creatorName":"澤田, 浩一","creatorNameLang":"ja"},{"creatorName":"サワダ, コウイチ","creatorNameLang":"ja-Kana"}],"familyNames":[{"familyName":"Sawada","familyNameLang":"en"},{"familyName":"澤田","familyNameLang":"ja"},{"familyName":"サワダ","familyNameLang":"ja-Kana"}],"givenNames":[{"givenName":"Koichi","givenNameLang":"en"},{"givenName":"浩一","givenNameLang":"ja"},{"givenName":"コウイチ","givenNameLang":"ja-Kana"}],"nameIdentifiers":[{"nameIdentifier":"517","nameIdentifierScheme":"WEKO"},{"nameIdentifier":"30372080","nameIdentifierScheme":"e-Rad","nameIdentifierURI":"https://kaken.nii.ac.jp/ja/search/?qm=30372080"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2024-10-02"}],"filename":"fra_k_2_47.pdf","filesize":[{"value":"1.5 MB"}],"format":"application/pdf","licensetype":"license_0","mimetype":"application/pdf","url":{"url":"https://fra.repo.nii.ac.jp/record/2010770/files/fra_k_2_47.pdf"},"version_id":"a7bf0ae3-ffef-4790-ad2a-8f1f0a3aba42"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"echo sounder; target strength; reverberationvolume; split-beam; echo trace analysis","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"魚のターゲットストレングスの高精度推定に関する研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"魚のターゲットストレングスの高精度推定に関する研究","subitem_title_language":"ja"},{"subitem_title":"Studyon the Precise Estimation of theTarget Strength of Fish","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"10","path":["1724312491438"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2024-10-02"},"publish_date":"2024-10-02","publish_status":"0","recid":"2010770","relation_version_is_last":true,"title":["魚のターゲットストレングスの高精度推定に関する研究"],"weko_creator_id":"10","weko_shared_id":-1},"updated":"2025-03-27T05:00:22.063276+00:00"}