碩士 / 國立海洋大學 / 漁業科學學系 / 90 / The AVHRR SST and SeaWiFS chlorophyll_a pigment concentration images with EOF and wavelet image analysis method were used to find out the relationship between the fluctuation of squid fishery and oceanic features in these waters. The result indicates that the oceanic features in the northeastern of Taiwan are related to the exchange of the Kuroshio Current and the Mainland Coastal Current. The squid will appear inside the counter current of Kuroshio or Upwelling. In the later spring when the offshore front shifted west, the fishing activity was aggregated relatively northward, and when the offshore front shifted east, the fishing activity was aggregated relatively southward. Excluding the period of typhoon in the season of summer and autumn, the fishing ground were mainly formed further southward in the vicinity of upwelling. These results showed that locations of fishing grounds depend not only on ocean geography conditions over an extensive range of the Kuroshio area, but also on instantaneous ocean geography environments around the fishing grounds.
Otherwise the factors associated with the variation of fishing condition for squid fishery, are mainly included the distance between the front of Kuroshio and the coast line of China, the SST gradient between the center of fishing ground and the front, the standard deviation of chlorophyll_a, the mean and the standard deviation of SST, and the Upwelling area. The results of discriminate analysis also suggested that the mean discriminate ratio for fishing condition level were reach to 74.4%.
| Identifer | oai:union.ndltd.org:TW/090NTOU0451025 |
| Date | January 2002 |
| Creators | Chih-hao Shiao, 蕭志豪 |
| Contributors | Ming-an Lee, Ching-hsin Liao, 李明安, 廖正信 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 93 |
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