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Measures for co-existence between seals and coastal large-scale salmon set net fisheries : Mitigation of catch damage by the use of rope grid
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| Title: | Measures for co-existence between seals and coastal large-scale salmon set net fisheries : Mitigation of catch damage by the use of rope grid |
| Authors: | Kuramoto, Yosuke Browse this author | | Fujimori, Yasuzumi Browse this author →KAKEN DB | | Ito, Ryohei Browse this author | | Kobayashi, Yumi Browse this author | | Sakurai, Yasunori Browse this author →KAKEN DB |
| Keywords: | Kuril harbor seal | | Seal prevention | | Hidden impact | | Underwater observation | | On-board observation |
| Issue Date: | Oct-2021 |
| Publisher: | Elsevier |
| Journal Title: | Fisheries research |
| Volume: | 242 |
| Start Page: | 106041 |
| Publisher DOI: | 10.1016/j.fishres.2021.106041 |
| Abstract: | In recent decades, conflict between Kuril harbor seals (Phoca vitulina stejnegeri) and local fisheries have become a serious problem in Hokkaido, northern Japan. Catch damage in large-scale salmon set nets may be mitigated by attaching a rope grid to set net funnels. We investigated the effectiveness of different rope grids on catch damage caused by seals, and evaluated hidden impacts on catch caused by the seals using an underwater camera for observation of seal and salmon behavior coupled with on-board observations of catch and catch damage. The rate of seal prevention was highest for rope grid with 20 cm x 20 cm spacing (97.5 %). The percentage of catch damage in the set net with this rope grid was significantly lower than that for the set net with other rope grid which was easy to enter for seals. We concluded that it is effective to attach an appropriate rope grid to set nets to prevent seals from entering fish bags and to ensure salmon catch amounts. The existence of "hidden damage" was quantitatively revealed via the underwater observation of seals removing salmon from the fish bag, and by comparing the number of salmon between underwater observation and on-board observation. |
| Rights: | This manuscript version is made available under the CC-BY-NC-ND 4.0 license. | | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/90619 |
| Appears in Collections: | 水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 藤森 康澄
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