{"created":"2025-04-25T02:15:35.548443+00:00","id":2014447,"links":{},"metadata":{"_buckets":{"deposit":"4833dff6-05b4-414e-8c5a-4bfdbb25b794"},"_deposit":{"created_by":10,"id":"2014447","owners":[10],"pid":{"revision_id":0,"type":"depid","value":"2014447"},"status":"published"},"_oai":{"id":"oai:fra.repo.nii.ac.jp:02014447","sets":["1:7:1745476182026"]},"author_link":[],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1995-10","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicNumberOfPages":"10","bibliographicPageEnd":"44","bibliographicPageStart":"35","bibliographicVolumeNumber":"24","bibliographic_titles":[{"bibliographic_title":"栽培漁業技術開発研究","bibliographic_titleLang":"ja"},{"bibliographic_title":"Technical Reports of Japanese Sea Ranching Programs","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"視覚に依存した群れ行動を顕著に示すシマアジが夜間のような低照度下でどのような行動をしているかを,日齢201日の種苗を用い,実験水槽の照度を種々変化させて調べた。水中照度を0 lxからある一定の照度に増した場合,10-3 lx以上では群れを形成できたのに10-4 lx以下では形成できず、同種の成群の照度閾値は10-3 lxと10-4 lxの間にあると考えられた。240 lxと 10-2 lxにおける群れ行動は昼夜で違い,夜間は活発に群泳(Schooling)し,昼間は群がり(Aggregation)の状態となる変化を繰り返した。遊泳速度は,成群可能な10-3 lx以上では照度の減少に伴い低下したのに,成群できない 10-4 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