{"created":"2023-07-25T08:02:55.939956+00:00","id":771,"links":{},"metadata":{"_buckets":{"deposit":"955a2586-d9bc-46a2-819c-49bb97f3eace"},"_deposit":{"created_by":3,"id":"771","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"771"},"status":"published"},"_oai":{"id":"oai:ir.kagoshima-u.ac.jp:00000771","sets":["228:262:5793"]},"author_link":["4790","5104","5105"],"item_7_alternative_title_18":{"attribute_name":"別言語のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Fundamental Studies on the Fishing Efficiencies of the Trawling Nets"}]},"item_7_alternative_title_19":{"attribute_name":"タイトルよみ","attribute_value_mlt":[{"subitem_alternative_title":"ソコビキアミ ノ ギョカク セイノウ ニ カンスル キソテキ ケンキュウ"}]},"item_7_biblio_info_5":{"attribute_name":"収録雑誌名","attribute_value_mlt":[{"bibliographicIssueNumber":"2","bibliographicPageEnd":"137","bibliographicPageStart":"1","bibliographicVolumeNumber":"20","bibliographic_titles":[{"bibliographic_title":"鹿児島大学水産学部紀要=Memoirs of Faculty of Fisheries Kagoshima University"}]}]},"item_7_date_6":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"1972-03-05"}]},"item_7_description_4":{"attribute_name":"要約(Abstract)","attribute_value_mlt":[{"subitem_description":"This research was carried out with the use of the three kinds of trawling net using of\nby the fishing boats, namely, trawlers, bull trawlers or Danish seiners belonging to the\ngroups of the fishing boats of the mother ship fishery, fishing on the continental shelf of\nthe eastern part of the Bering Sea including near the shelf, during the term from April to October for the three years of 1963, 1965 and 1967.\nAs to the items of the fishing gears used in this research, in table 3, are shown the\ntonnage of the fishing boat, its number and the scale of the net used in this experiment.\nNamely, the number of the monther ship is 3 ; the number of the fishing boats belonging\nto those mother ships, is as in the following : ― the number of the side trawlers with tonnage of 370, is 2 ; that of the stern trawlers with the tonnage of 299, is 3 ; the total of\nwhich being 5 ; that of the bull trawler with the tonnage of 121 and with the tonnage of\n98, is 4 and 2 ; the total number of with being 6 ; the total number of the Danish seiner is, 11 ; with the tonnage range from 65 to 92.\nIn case of those trawling nets, in accordance with varieties in the sort of the net, a\nconsiderable difference is to be noted both in the weight of the ground rope and in the\nbuoyancy of the float, but the whole lengths of the nets are almost equal.\nAs may be seen in the introduction of this thesis, the purpose of this research is as in\nthe following : ― through the three sorts of the fishing net used as the materials of this\nexperimental research, namely, the trawl net, the bull trawl net, and the Danish seine,\nthe following 3 items were aimed : (1) the attempted clarifications of the fishing efficiency\nof the fishing net by means of actual measurements and the model experiments ; (2) the\nconfirmation of the fundamental characteristics in the designing and making-up the respective\nnet ; (3) accompanied with the analyses of the physical and biological factors in drawing the design of the trawling net in possession of high effectivity.","subitem_description_type":"Other"},{"subitem_description":"The experimental methods used in this research are as in the following :\n1. With the use of Radar equipped on board of the mother ship lying at anchor, some\ntracings were made of the towing speed and the removing distance concerning the nets\ntowed by trawlers, bull trawlers and Danish seiners and as the result of the tracings the\nsweeping area of the actual net towing was counted, and after combining this counted value with the value of the filtering volume, which will by mentioned in item 3, some numerical\nvalue, which is assumed to be indispensable for the determination of the fishing efficiency\nof the fishing net, was obtained.\n2. Concerning Danish seine, in the three stages of the commencement of net to wing, its finishing and the end of net-lifting, the gradual changes in the status of boat and net\nhappening in the lapse of time, were ascertained with the use of experimental models in\n50m.-pool, with the counting clarification of the towing speed, interval between the wing\nends, and the sweeping area of the towing rope.\n3. On the three sorts of trawling net (trawl net, bull trawl net, Danish seine), model\nexperiments were carried out ; and in those experiments, first the area of the net mouth under towing was counted, and with the use of the counted value, the filtering volume was\nfixed out, and after combining this with the sweeping area mentioned in item 1, some\nnumerical value was fixed, and by which the fishing efficiency of the various kinds of fishing\nnet was compared.","subitem_description_type":"Other"},{"subitem_description":"4. For the purpose of using as the fundamental criterion in drawing the basic designs\nof the respective trawling net, the following experiments were carried out : ―\na) Three sorts of trawling net having the bag nets made to be equal typed, in spite of\ntheir being made of 2 sheets, 4 sheets and 6 sheets of net, each of which being typical\nof the trawling net, were designed, and with the use of these, some model experiments\nwere carried out, and the respective characteristics and efficiency were brought under\ncomparative examinations.\nb) Concerning the shape of the net under towing, its resistance against the flowing\nwater and the behaviours of the fish schools entering into the net ; the causes of such\nphenomena were put under considerate examinations, and the distribution of the current\nvelocities in and out of the net were measured by using model nets.\nc) The border line of the limited possibilities of making the turning movements or\nthe respective fish body within the bag net, in other words, the dimension of the swimming capabilities was fixed experimentally.\nd) The problem of what behaviour is to be taken by the fish schools against the variations of the flowing velocity within the bag net,\nwas put under consideration to bring\nit to a reasonable solution, in connection with the size of the fish body and in that with\nthe size and the scale of the fish schools, respectively ; and at the same, the net formation and the net resistance at that time, were put under investigations.\ne) In the 50m.-pool, using gold fish, the behaviours of the fish schools to the rope were brought under grasping, with the investigations of the driving-in effects of the net\nperformed.","subitem_description_type":"Other"}]},"item_7_full_name_2":{"attribute_name":"著者よみ","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"ヒゴ, ノビオ"}]}]},"item_7_full_name_3":{"attribute_name":"別言語の著者","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"HIGO, Nobio"}]}]},"item_7_publisher_23":{"attribute_name":"公開者・出版者","attribute_value_mlt":[{"subitem_publisher":"鹿児島大学"}]},"item_7_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0453087X","subitem_source_identifier_type":"ISSN"}]},"item_7_source_id_9":{"attribute_name":"NII書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AN00040498","subitem_source_identifier_type":"NCID"}]},"item_7_subject_15":{"attribute_name":"NDC","attribute_value_mlt":[{"subitem_subject":"664","subitem_subject_scheme":"NDC"}]},"item_7_text_24":{"attribute_name":"公開者よみ","attribute_value_mlt":[{"subitem_text_value":"カゴシマ ダイガク"}]},"item_7_text_25":{"attribute_name":"公開者別名","attribute_value_mlt":[{"subitem_text_value":"Kagoshima University"}]},"item_7_text_39":{"attribute_name":"旧URI","attribute_value_mlt":[{"subitem_text_value":"http://hdl.handle.net/10232/13436"}]},"item_7_version_type_14":{"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_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"肥後, 伸夫"}],"nameIdentifiers":[{},{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-10-27"}],"displaytype":"detail","filename":"AN00040498_v20-2_p1-137.pdf","filesize":[{"value":"20.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"AN00040498_v20-2_p1-137.pdf","url":"https://ir.kagoshima-u.ac.jp/record/771/files/AN00040498_v20-2_p1-137.pdf"},"version_id":"114eb168-1cd6-4435-acd4-57d4ab6f7fb1"}]},"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":"底曳網の漁獲性能に関する基礎的研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"底曳網の漁獲性能に関する基礎的研究"}]},"item_type_id":"7","owner":"3","path":["40","5793"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-06-18"},"publish_date":"2015-06-18","publish_status":"0","recid":"771","relation_version_is_last":true,"title":["底曳網の漁獲性能に関する基礎的研究"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2024-01-30T05:49:43.047288+00:00"}