碩士 / 國立高雄海洋科技大學 / 漁業生產與管理研究所 / 104 / In recent years, seabird populations have been threatened in term of fisheries bycatch, and drifting longline is considered as greater impact on this issue which is concerned by many countries and conservation organizations. Nowadays, many regional fishery management organizations (RFMOs) have implemented a number of seabird mitigation measures, and the Western and Central Pacific Fisheries Commission (WCPFC) regulates small-scale longliners which operate in the north of 23˚N of Pacific Ocean have to choose at least one of four measures as night setting, tori lines, weighted branch lines and side setting with a bird curtain from December 2015.However,it needs to be surveyed whether small-scale longline fleet is able to meet the requirements of the seabirds mitigation measures of WCPFC without effecting both catch rate and personnel safe security. Therefore, this study attempts to use the small-scale longline vessels operated in WCPFC areas as samples to carry out a number of installed tori lines and weighted branch lines experiments following the WCPFC measures as reference. Also the e-observers are assigned to record the bycatch rate and distribution of seabirds in this area for installed tori lines or weighted branch lines for 16 and 55 cruises tests, respectively. The results show that tori line has no negative impact on crew safety while weighted branch lines have significantly negative effects on catch rates. Finally, this study suggests that fishermen could choose either night setting or tori lines during operation in this area.
| Identifer | oai:union.ndltd.org:TW/104NKIM0451010 |
| Date | January 2016 |
| Creators | OU﹐ XIAO-MING, 歐效銘 |
| Contributors | CHEN, CHAO-CHING, SHEN, SHENG-ZHI, 陳朝清, 沈聖智 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 75 |
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