碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 95 / Abstract
Skates and rays are caught by trawlers in northeastern Taiwan waters. Most of them are utilized as fish fodder (feeding stuffs) for aquaculture and some species of them are for human consumption. The purpose of this study is to analyze the reproductive biology of Sepia stingray, Urolophus aurantiacus, which collected from northeastern Taiwan waters. Specimens were sampled from Nov. 2005 to Feb. 2007 at Dashi fish market in Yilan country. All specimens were captured from adjacent waters of Kueishan Island, Auti and Peng Chia Yu (24°30´~26°N, 121°30´~122°30´E) by trawlers under the depth 30~300 m. 294 males and 549 females (22 pregnant individuals included) were used for this study. The relationship between disc width (DW; in cm) and total weight (TW; in g) had significantly difference between sexes (P<0.05). The relationship between disc width (DW; in cm) and eviscerated weight (EW; in cm) had not significantly difference between sexes, was described as EW=0.0538×DW2.8898 (n=843, P<0.05). Sizes at 50% sexual maturity are 16 and 14.9 cm DW for both females and males, respectively. The sex ratio of embryo individuals showed no significant differences by the Chi-square test, but more immature and mature females collected during the sampling period (P<0.05). Sepia stingray is an aplacental viviparous species and posses a functional left ovary. According to the monthly changes of GSI, the month average maximum follicle diameter and the disc width of embryos U. aurantiacus by month, this species is able to reproduce all around, but the peak is in the later half year.
Keywords: Urolophus aurantiacus、reproductive biology、Taiwan.
| Identifer | oai:union.ndltd.org:TW/095NTOU5451023 |
| Date | January 2007 |
| Creators | Chen Shien Yu, 余俊賢 |
| Contributors | , 莊守正, 王世斌 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 90 |
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