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- Potential Contributions by Escaped Cultured Eels to the Wild Populaion of Japanese Eel Anguilla japonica in the Kao-Ping River
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題 名 | Potential Contributions by Escaped Cultured Eels to the Wild Populaion of Japanese Eel Anguilla japonica in the Kao-Ping River=逃逸養殖鰻對高屏溪野生日本鰻族群的潛在貢獻 |
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作 者 | 林裕嘉; 飯塚義之; 曾萬年; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 36:3 2009.09[民98.09] |
頁 次 | 頁179-189 |
分類號 | 439.5 |
關鍵詞 | 日本鰻; 養殖鰻; 銀化; 耳石鍶鈣比; Japanese eel; Anguilla japonica; Cultured ell; Silvering; Otolith Sr:Ca ratios; |
語 文 | 英文(English) |
中文摘要 | 石鍶鈣比重建其洄游環境史。結果發現2004~2006年銀鰻之平均年齡比1999~2003期間顯著為小。2004年之前以雌性為優勢,然而2004~2005年改變成以雄性為優勢(均質性檢定,χ(上標 1 下標 2) = 69.5和103.5,機率皆小於 0.001)。可是2006年之後,性比就恢復到颱風之前的雌性優勢狀態(χ(上標 5 下標 2) = 8.22,機率大於 0.1)。銀鰻的洄游型也有明顯地變化,從1999~2003年期間以鹹淡水型為主,變成2004~2006年以淡水型為主(適合度檢定,χ(上標 1 下標 2) = 252,機率小於 0.001)。這些現象指明,逃逸養殖鰻對野生日本鰻族群的影響期間不超過兩年。有一部份逃逸養殖鰻在這兩年期間已達到銀化階段,並且有可能貢獻野生的產卵族群。 |
英文摘要 | Due to Typhoon Mindulle a lots of cultured Japanese eel Anguilla japonica escaped from aquaculture ponds to the Kao-Ping River in July, 2004. To evaluate whether the escaped cultured eels contributed to the wild silver eel population, the compositions in age, sex ratio, and migratory histories indicated by otolith Sr:Ca ratios of the silver eels in the river were examined from during 1999 to 2006. Mean ages were younger in 2004 to 2006 than in 1999 to 2003 and the sex ratio of the eels had significantly changed from female-dominated before 2004 to male-dominated in 2004 and 2005 (Test of homogeneity, χ(superscript 1 subscript 2) = 69.5 and 103.5, all p < 0.001). However, after 2006 the sex ratio reverted to their previous conditions (Test of homogeneity, χ(superscript 5 subscript 2) = 8.22, p > 0.1). The dominant migratory types of the silver eels also significantly changed from brackish-water type in 1999 ~ 2003 to freshwater type in 2004 ~ 2006 (Goodness of fit, χ(superscript 1 subscript 2) = 252, p < 0.001). This indicated that the effects of escaped eels on the wild eel population were of not more than two years duration. Some escaped eels have silvered and left the river to potentially contribute to the wild spawning stock within two years. |
本系統中英文摘要資訊取自各篇刊載內容。