碩士 / 國立臺灣大學 / 海洋研究所 / 91 / Length-frequency data of the yellowfin tuna (Thunnus albacares) caught by the Taiwanese offshore longline vessels was collected monthly at Tungkang fish market between September 2001 and October 2002. These samples were used to estimate the von Bertalanffy growth parameters and the mean length at age for yellowfin tuna by the length-based MULTIFAN method. Twenty-four cases were considered and the best match was found in the case when April, was set as month 1, the sample number was merged to 12 by month and 3 cm was selected for length interval. In this case, the von Bertalanffy growth parameters were estimated as growth coefficient K = 0.392 yr-1, asymptotic fork length FL∞ = 175.0 cm, and theoretical age at zero length t0 = 0.00306 yr. Six age classes were identified and mean length at age was L1 = 56.16 cm, L2 = 95.00 cm, L3 = 120.95 cm, L4 = 138.48 cm, L5 = 150.32 cm, and L6 = 158.32 cm. The estimated longevity (tmax) was 7.65 years.
| Identifer | oai:union.ndltd.org:TW/091NTU00279032 |
| Date | January 2003 |
| Creators | Nan-Jay Su, 蘇楠傑 |
| Contributors | Chi-Lu Sun, 孫志陸 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 74 |
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