碩士 / 國立東華大學 / 海洋生物研究所 / 106 / Finless porpoises in the Indo-Pacific region include the narrow-ridged finless porpoise (Neophocaena. asiaeorientalis sunameri), freshwater inhabiting Yangtze finless porpoise (N. asiaeorientalis asiaeorientalis), and the Indo-Pacific (wide-ridged) finless porpoise (N. phocaenoides). Both the narrow and wide-ridged finless porpoises are commonly seen and inhabit sympatrically in the Taiwan Strait. One hundred and twenty-one specimens of finless porpoises stranded or obtained incidentally by fishing were recoded so far. In this study, ages of the two porpoise species were determined by growth-layer-group counting of thin-sectioned teeth and growth curves were fitted and compared. Finless porpoises stranded in western coast of Taiwan, Penghu, Kinmen, and Matsu from 2000 to 2017 were collected, which 45 specimens with 62.5-156.0 cm for narrow-ridged finless porpoise and 72 specimens ranging 75.0-182.0 cm in body length were for the wide-ridged ones. Ages of the 25 narrow-ridged finless porpoise were determined between 0-11 years and 90.0-146.0 cm, whereas those for the 31 wide-ridged ones were 0 yr and 12 yr for a length range of 77.0-182.0 cm. Age-length data were fitted by the von Bertalanffy and Gompertz growth curves and the asymptotic length and growth rate were 141.76 cm, 0.28 (von Bertalanffy) and 139.79 cm, 0.34 (Gompertz) for the narrow-ridged finless porpoise, and 178.32 cm, 0.26 (von Bertalanffy) and 175.11 cm, 0.34 (Gompertz) for the wide-ridged one, indicating that growth rates were similar with two finless porpoises and the wide ridged finless porpoise reached larger size than the narrow-ridged ones.
| Identifer | oai:union.ndltd.org:TW/106NDHU5277020 |
| Date | January 2018 |
| Creators | Kuan-Tzu Huang, 黃冠慈 |
| Contributors | Chih-Wei Chang, Chiou-Ju Yao, 張至維, 姚秋如 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 32 |
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