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題 名 | The First Time of Leptocephali of Japanese Eel Anguilla Japonica Collected by Taiwanese Researchers=臺灣水產研究者首度捕獲日本鰻的柳葉形仔鰻之記錄 |
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作 者 | 廖一久; 郭慶老; 曾萬年; 黃士宗; 吳繼倫; 王佳惠; 王友慈; | 書刊名 | 水產研究 |
卷 期 | 4:2 1996.12[民85.12] |
頁 次 | 頁107-116 |
分類號 | 438.661 |
關鍵詞 | 柳葉形仔鰻; 日本鰻; 臺灣研究人員; 產卵場; Leptocephali; Japanese eel anguilla japonica; Taiwanese researcher; Spawning ground; |
語 文 | 英文(English) |
中文摘要 | 1995年8月16日至23日,台灣省水產試驗所 (水試一號( 試驗船於 12o30'N - 14 o30'N與 131 o30'E - 140 o30'E之間,也就是菲律賓以東的海域, 捕獲 27 尾柳葉形仔鰻,其中三尾是日本鰻。這是台灣有史以來,第一次捕獲 日本鰻的柳葉形仔鰻,其意義非常重大。三尾柳葉形仔鰻的體長分別為 27.4, 28.8 以及 31.4 mm﹐由耳石日週輪數目研判,其日齡分別為46,50及51天, 體成長率為0.577 - 0.658 mm.d-1,孵化日期為7月1日及3日,產卵日期則為 農曆的6月2日及6月4日,因此,鰻魚可能在新月期間產卵。綜合以上各點, 本研究再次證實日本鰻是在夏季產卵,惟根據採集地點與海流方向,這三尾柳 葉形仔鰻之體長與日齡不足以肯定或說明目前所認知的產卵埸,其產卵場之分 布範圍應相當廣闊。 |
英文摘要 | Three leptocephali of Japanese eel Anguilla japonica were collected in the presumed spawning ground of 12o30(-14 o30(N and 131o30(-140o30(E, on 16 to 23 August, 1995. It was the first time of such collection by Taiwanese researchers. Total lengths of the leptocephali were measured as 27.4, 28.8 and 31.4 mm, respectively. Their daily ages were estimated to be 46, 50 and 51 days by counting otolith growth increments, and growth rates be 0.577-0.658 mm.d-1. The daily ages of these three leptocephali were back-calculated for birth dates be July 1 and 3, and the spawning dates were on June 2 and 4 of the lunar calendar which were in the period of new moon. This study confirms that Japanese eel spawns in summer. Based on the localities of collections and the westward direction of ocean current, the body lengths and the daily ages of these three leptocephali are difficult to depict the spawning ground as previously known. Spawning ground is probably rather widely spread. |
本系統中英文摘要資訊取自各篇刊載內容。