碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 99 / Abstract
The yellow spot fan ray, Platyrhina tangi is an epibenthic batoid and widely distributes in sandy area under the depth of <100 m off northeastern Taiwan waters. Total of 465 females (11.7-58.5 cm TL) and 216 males (12.7-46.9 cm TL) including 37 neonates (mean size at birth 11.86 cm TL) were collected weekly in Daxi fish market, Yilan from Sep. 2009 to Nov. 2010.
Vertebrae were used to estimate the age of specimens in this study. The maximum observed growth band pairs (consist of opaque and translucent band) were 20 and 11 pairs for female and male, respectively. Band pairs were assumed to be formed annually. The best fitted growth model was von Bertalanffy growth function. Parameters for female and male were estimated to be L∞=59.3 cm TL, k=0.12 yr-1, t0= -1.83 and L∞=49.6 cm TL, k=0.185 yr-1, t0= -1.68, respectively.
The total length at 50% sexual maturity for female and male were 33.8 cm and 32.6 cm TL, and the age were both 4.1 yrs. Mating and breeding season were from Nov. to Dec. and Oct. to Dec., respectively. Gestation period was calculated for about 12 months, but a six to eight months phase of embryonic diapause was taken into account. The reproductive cycle was also estimated to be about a year. Uterus fecundity ranged from 2 to 23 embryos.
| Identifer | oai:union.ndltd.org:TW/099NTOU5451021 |
| Date | January 2011 |
| Creators | Tzu Chi Hsieh, 謝孜齊 |
| Contributors | Shoou Jeng Joung, 莊守正 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 113 |
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