碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 97 / Abstract
The mean trophic level (MTL) and the fishing-inbalance (FiB) index were estimated by the set-net fishery landings from Xinxiefa-Ilan, Sanxiantai-Taitung, Manfeng- PingTung and Rifeng-Miaoli fishing grounds in the coastal waters of Taiwan. We also used ratio-to-moving-average method to calculate Season Index (SI), and examine seasonality by ANOVA. Then, we analyzed the composite seasonality changes hidden in the landing data. The results of this study were summarized as follows:
1. The annual MTL and landings in Xinxiefa and Manfeng fishing grounds were decline gradually, but rose in Sanxiantai and Rifeng fishing grounds.
2. The FiB indexes were mostly lower than 0 in Xinxiefa and Manfeng fishing grounds. It meant that the structure of food pyramid for the set-net fishery were weaken even more. Contrarily, the FiB indexes were mostly higher than 0 in Sanxiantai and Rifeng fishing grounds.
3. SI showed that the ratio landings of spring species were greater than 40% in Xinxiefa and Manfeng fishing grounds. While, the ratio landings of spring species were reduced gradually in Sanxiantai fishing grounds, but the ratio landings of autumn/winter species were increased gradually. Besides, the ratio landings of autumn species were increase gradually, but the ratio landings of spring/winter species were reduced gradually in Rifeng fishing grounds.
4. The correlation analyses suggested that the landings and SST had highly relationship in Xinxiefa fishing grounds. While, the correlation analyses suggested that the MTL and SST had highly relationship in the other fishing grounds.
| Identifer | oai:union.ndltd.org:TW/097NTOU5451018 |
| Date | January 2009 |
| Creators | Chao-Yi Yu, 游朝義 |
| Contributors | Cheng-Hsin Liao, 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 | 95 |
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