碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 102 / In order to increase the population size of the Taiwan landlocked salmon (Oncorhynchus masou formosanus), the efforts in reintroduction of this fish to the historical watershed had been excuted ever since 2006. From October 2006 to November 2013, a total of 2590 fish had been released to Nan-Hu creek (250 fish in 2006, 165 fish in 2007), Su-Jie-Lan creek (250 fish in 2006, 165 fish in 2007), I-kawan creek (300 fish in 2008, 30 fish in 2010 , 100 fish in 2011), Lo-Ye-Wei creek (150 fish in 2009, 380 fish in 2010), Gon-gamin creek (Su-Jie-Lan upstream branch I, 180 fish in 2010), Gon-bkuli creek (Su-Jie-Lan upstream branch Ⅱ, 100 fish in 2009, 120 fish in 2010), Le-Shan creek (100 fish in 2011, 150 fish in 2013).
It has been found that those released habitals were not suitable to create effective size of population after releases in Nan-Hu, Su-Jie-Lan and I-kawan creeks, from2006 to date, there were no newborn fish either in Nan-Hu or I-kawan creeks. The Gon-bkuli creek (upstream branch Ⅱof Su-Jie-Lan creek) however had even produced small amount of newborn fish (20 fish in 2010, 6 fish in 2011), but disappeared in the year of 2013. Lo-Ye-Wei creek was proved to be a very good place for fish to thrive. After the two releases (150 fish in 2009；380 fish in 2010) , the population structure become very stabilized with age group percentage ratio ( 0+：1+：2+ ) were (49：45：6) in Oct.2011, (53：22：25) in Oct.2012 and (33：32：35) in Oct.2013. And the averaged population size was dynamically up and down around 1000 fish throughout the years from 2010 to 2013.
Factorial analysis of the specific growth rate (SGR) on the main effect of “Origin” showed, the fish of hatchery (H) had exhibited higher value than that of the released group (R) and the wild born group (W). The main effect of “Age” showed, SGR gradually reduce with increment of age, the 0+ age group showed the best followed by the 1+ age group, and the 2+ age group the worst. Fish grow faster during high temperature season than in low temperature season. The main effect of "Site" revealed that SGR of the hatchery station (Ha) was the best, followed by Se-Je-Lan creek, then Lo Ye-Wei creek, and Yu-Sheng creek was the worst.
Key word: Taiwan landlocked salmon (Oncorhynchus masou formosanus), released, Lo-Ye-Wei, Su-Jie-Lan, Le-Shan
| Identifer | oai:union.ndltd.org:TW/102NTOU5086024 |
| Date | January 2014 |
| Creators | Yu, Jia-Jyu, 余佳舉 |
| Contributors | Huang, Yii-Shing, 黃沂訓 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 84 |
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