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2階式トロールのグリッドパネル網目サイズと分離効果
https://fra.repo.nii.ac.jp/records/2011693
https://fra.repo.nii.ac.jp/records/2011693d13dbf9a-cd07-41eb-8be4-5a177e4851ca
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2024-10-11 | |||||
| タイトル | ||||||
| タイトル | 2階式トロールのグリッドパネル網目サイズと分離効果 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Separation efficiency of a two-level trawl using a separation grid-panel with different mesh sizes | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 著者 |
永松, 公明
× 永松, 公明× 久保田, 勝彦× 田渕, 清春× 巽, 重夫× 鎌野, 忠× 冨賀見, 清彦× 馬場, 英司× 井上, 悟× 藤石, 昭生 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | A bottom trawl fishery in the East China Sea has been one of Japanese main fisheries. Its management, however, is recently running into severe problems as the fish resource is decreasing. For sustainable utilization of the demersal resources, we designed a two-level trawl, in which the net-mouth for the lower level was covered with a grid-panel (square-mesh net panel) to separate marketable fish from the smaller or noncommercial fish. The main objectives of this study were to investigate the separation efficiency and size-selectivity of the gear. The experiments were conducted using three different mesh-bar sizes, 60mm, 90mm and 120mm, on the grid-panel. Fishing experiments with the gear were carried out in the East China Sea aboard the training vessel Koyo-maru in 1996 (60mm mesh-bar), 1997 (120mm) and 1998 (90mm). At the towing speed of 2.5-4.0knots, the heights of the net-mouth at the lower and upper parts of the gear were about 3-4m and 7m, respectively. Separation efficiencies, defined by the ratio of the catch in the upper cod-end to the total catch of the three mesh bar sizes were compared. The separation efficiencies for the 60mm, 90mm and 120mm mesh-bar size grid-panels were about 80%, 65% and 50%, respectively. As a result of the comparison of the size-selectivity of the different mesh-bar sizes for 5 species, the 90 and 120mm mesh-bar gridpanel have the appropriate size-selectivity for the separation of the smaller fish. In order to maintain the quantity of fish entering the upper cod-end, the 120mm mesh-bar grid-panel may be too large. Accordingly, the 90mm mesh-bar size is the recommended size for the grid-panel of the bottom trawl in the East China Sea. | |||||
| 言語 | en | |||||
| 書誌情報 |
ja : 水産大学校研究報告 en : Journal of National Fisheries University 巻 48, 号 1, p. 1-10, ページ数 10, 発行日 1999-07-30 |
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| 出版者 | ||||||
| 出版者 | 水産大学校 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | National Fisheries University | |||||
| 言語 | en | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0370-9361 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00124678 | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | fishu_k_48_1 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010612447 | |||||
| 言語 | ja | |||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||
