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題 名 | Age of Pacific Tarpon, Megalops Cyprinoides, at Estuarine Arrival and Growth during Metamorphosis=大眼海鰱抵達河口時之日齡及其變態過程之成長現象 |
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作 者 | 曾萬年; 吳昭瑩; 王友慈; | 書刊名 | 動物研究學刊 |
卷 期 | 37:3 1998.07[民87.07] |
頁 次 | 頁177-183 |
分類號 | 388.5 |
關鍵詞 | 大眼海鰱; 耳石; 日齡; 成長; 變態; Megalops cyprinoides; Otolith; Age; Growth; Metamorphosis; |
語 文 | 英文(English) |
中文摘要 | 大眼海鰱( Megalops cyprinoides )的日成長輪之形成呈現 24 小時的週期, 可以用來查定野生標本的日齡。1995 年 9 月 15 ∼ 24 日在臺灣北部河口域所捕獲的標本 ,發育階段為第一次變態期,體長範圍 17.8 至 32.9 mm TL,日齡 20 - 39天(平均 28.5 天)。由耳石邊緣上的不透明帶及其中的日輪數,推測大眼海鰱在到達河口之前即將始變態 。由成長率與抵達日齡之逆相關關係,證明成長快者比成長慢者,早抵達河口域。變態過程 中體長縮小,但耳石則繼續成長。由飼養實驗發現,大眼海鰱變態過程大約需要 14 天。 |
英文摘要 | The age of Pacific tarpon, Megalops cyprinoides (Broussonet), at estuarine arrval was estimated by counting otolith growth increments from specimens collected in the Gongshytyan Brook estuary of northern Taiwan on 15 to 24 September 1995. The daily deposition of otolith growth increments provided a mean to estimate age of individuals. Tarpon at estuarine arrival were in the 1st metamorphic stage. Their body lengths ranged between 17.8 and 32.9 mm TL (mean = 25.6 mm TL) and ages between 20 and 39 d (mean = 28.5 d). A metamorphic mark within the otolith indicated that the fish had begun to metamorphose several days before arriving at the estuary. Negative correlations between age estimates, and both somatic and otolith growth rates indicate that faster-growing tarpon arrived at the estuary earlier than did slower-growing ones. Otolith growth continued while body length was reduced during metamorphosis. The duration of metamorphosis for Pacific tarpon was estimated to be approximately 14 d. |
本系統中英文摘要資訊取自各篇刊載內容。