{"created":"2024-06-18T03:45:26.093289+00:00","id":2007470,"links":{},"metadata":{"_buckets":{"deposit":"f5ecfa06-fd37-4fe6-91f5-d64f15902811"},"_deposit":{"created_by":10,"id":"2007470","owners":[10],"pid":{"revision_id":0,"type":"depid","value":"2007470"},"status":"published"},"_oai":{"id":"oai:fra.repo.nii.ac.jp:02007470","sets":["12:14:1716955633551"]},"author_link":[],"control_number":"2007470","item_10002_biblio_info_7":{"attribute_name":"bibliographic_information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1980-12","bibliographicIssueDateType":"Issued"},"bibliographicNumberOfPages":"13","bibliographicPageEnd":"19","bibliographicPageStart":"7","bibliographicVolumeNumber":"1","bibliographic_titles":[{"bibliographic_title":"養殖研究所研究報告","bibliographic_titleLang":"ja"},{"bibliographic_title":"Bulletin of National Research Institute of Aquaculture","bibliographic_titleLang":"en"}]}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"In order to elucidate the cause of annual fluctuation in size of spawning kokanee, Oncorhynchus nerka in Lake Towada, relationship between age at maturity and growth rate was studied using 786 fish collected with gill nets in July from 1976 to 1979. Relationship between spawning time of individual fish and their growth was also investigated with the egg-taking records of Towada-ko Kokanee Hatchery and 1227 fish captured as spawners in 1976. From year to year basis, fluctuation in growth rate in Lake Towada was relatively narrow, but the size for maturity and spawning period changed markedly. There was close correlation between spawning time and the size of spawner, that is, the fish matured at younger age probably due to thier rapid growth were smaller than those matured at older age, and spawning period became earlier in the year when percentage of those older larger fish in the spawners was high. Thus, the fluctuation in spawner's size seemed to be affected mainly by the difference in age composition, but not growth rate per se of that particular year.","subitem_description_language":"en","subitem_description_type":"Abstract"},{"subitem_description":"1 十和田湖のヒメマスにみられる親魚の大きさの年変動の原因を明らかにする目的で,成熟年齢と成長の関係を調査した。2 親魚の大きさは産卵時期にも影響しているようで,大型の年には産卵期が早くなり小型の年には遅くなっていた。3 早い時期に産卵した大型個体は,完熟に達する時期が早いことと大型卵を産出したことから高齢魚と推定された。4 十和田湖では成長の年変動はさほど大きくないことが明らかになった。これらのことから,親魚の大きさに変動がみられるのは,大型の高齢魚の割合すなわち年齢組成が変化するためと考えられた。5 成長が良かった1975年群は,2.で例年になく刺網にかかり,生後4年目には多くの個体が小型の親魚として産卵した。6 生物学的最小形は成長速度によって変る可能性が認められた。すなわち,成長の速い個体では小型魚で,あるいはより若齢で成熟し,成長の遅い個体では逆の現象が起るものと推察された。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"養殖研究所","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":"nria_k_1_7","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/2010230725","subitem_relation_type_select":"URI"}}]},"item_10002_source_id_11":{"attribute_name":"item_10002_source_id_11","attribute_value_mlt":[{"subitem_source_identifier":"AN00245945","subitem_source_identifier_type":"NCID"}]},"item_10002_source_id_9":{"attribute_name":"item_10002_source_id_9","attribute_value_mlt":[{"subitem_source_identifier":"0389-5858","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":"加藤, 禎一","creatorNameLang":"ja"}],"familyNames":[{"familyName":"加藤","familyNameLang":"ja"}],"givenNames":[{"givenName":"禎一","givenNameLang":"ja"}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"kokanee; growth rate; maturity; spawning; age composition","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":"item_resource_type","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"十和田湖ヒメマスの成熟年齢と成長の関係","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"十和田湖ヒメマスの成熟年齢と成長の関係","subitem_title_language":"ja"},{"subitem_title":"Relation between Age at Maturity and Growth of Kokanee, Oncorhynchus nerka, in Lake Towada.","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"10","path":["1716955633551"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2024-06-18"},"publish_date":"2024-06-18","publish_status":"0","recid":"2007470","relation_version_is_last":true,"title":["十和田湖ヒメマスの成熟年齢と成長の関係"],"weko_creator_id":"10","weko_shared_id":-1},"updated":"2025-03-25T08:11:15.387473+00:00"}