碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 105 / Sailfish (Istiophorus platypterus), caught in the commercial tuna longline and recreational fisheries, is an important apex predator in marine ecosystems. However, the spatial and temporal distributions of Atlantic sailfish may be impacted by marine environmental factors, leading to possible shifts in the distribution of the fishing ground. Generalized additive models (GAMs) were applied in this study to analyze the influence of chlorophyll-a concentration (CHL), sea surface height (SSH), mixing layer depth (MLD), sea surface temperature (SST), and sea surface salinity (SSS) on the catch rates and habitat distribution of Atlantic sailfish with data collected from the Taiwanese tuna longline fleet. All environment factors considered in the models were statistically significant and sea surface temperature was the primary factor that affects the distribution of sailfish. The hotspot of habitat distribution was between 20°N-20°S in the Atlantic Ocean. The results of this study could be used to predict the habitat distribution of Atlantic sailfish and provide useful scientific information for fisheries management, if needed, to potentially reduce the sailfish bycatch in tuna longline and purse seine fisheries.
| Identifer | oai:union.ndltd.org:TW/105NTOU5451014 |
| Date | January 2016 |
| Creators | Hsieh, Ping-Feng, 謝秉峯 |
| Contributors | Su, Nan-Jay, 蘇楠傑 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 66 |
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