碩士 / 國立中山大學 / 海洋事務研究所 / 101 / Saurida undosquamis (Richardson, 1848) is one of most abundant component of trawl fishery captures in the southwestern waters of Taiwan, but they have since decreased dramatically in recent year. Assessment of lizardfish stocks and establishment of fishery management guidelines are urgently needed. A total of 1237 individuals of the Saurida undosquamis, collected in the waters of southwestern Taiwan from March 2011 to June 2012, were using for fisheries biology study. A total of 804 individuals with fork lengths (FL) ranging from 85.92 to 416mm were examined using polished thin sections of otolith (sagittae). Monthly changes in the marginal increments, indicate that ring marks form once a year, from February to March. Male and Female specimens both had 1–8 ring marks. The estimated von Bertalanffy growth curves were male as FL = 386.251 × (1- e –0.15333 (t-2.06)) and that of female as FL =420.158 ×0.16354 (1- e -0.45 (t -1.53)). Our results suggest that females grow faster and grow bigger than males. The Growth performance index (Φ) estimated from von Bertalanffy growth equation (L∞,k) were male as 4.36 and that female as 4.46. we applied simultaneous confidence region (SCR) approach to the set of nearly Taiwan region. The results consider our Φ is in the credible range of growth index.Monthly variations in the gonadosmatic index and hepatosomatic index indicated that the Saurida undosquamis spawned from December to February. Two recruitments per year were found in January to February and April to June. In this study showing that Saurida undosquamis was an grew normaly and had long spawing season specie, with this characteristics they could endure higher fishery pressure than other fish. Although, in our study find that the limit length and age of Saurida undosquamis had smaller than 30 years ago, show that we should decrease the fishing pressure to ensure the sustainable use of this resources
| Identifer | oai:union.ndltd.org:TW/101NSYS5274010 |
| Date | January 2013 |
| Creators | Yuan-tian Chou, 周爰瑱 |
| Contributors | Hsin-Ming Yeh, Shui-Kai Chang, 葉信明, 張水鍇 |
| 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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