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題 名 | Recruitment and Hatching Dates of Grey Mullet (Mugil cephalus L.) Juveniles in the Tanshui Estuary of Northwest Taiwan=淡水河口烏魚稚魚之加入動態及孵化日 |
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作 者 | 張至維; 曾萬年; 李英周; | 書刊名 | 動物研究學刊 |
卷 期 | 39:2 2000.04[民89.04] |
頁 次 | 頁99-106 |
分類號 | 388.5 |
關鍵詞 | 烏魚; 耳石; 日齡; 孵化日; 淡水河口; Mugil cephalus L.; Otolith; Daily age; Hatching date; Tanshui estuary; |
語 文 | 英文(English) |
中文摘要 | 本研究自1995年11月至1996年3月及1996年11月至1997年3月間,於臺灣西北部的淡水河口域採集烏魚的稚魚,並利用耳石上的成長輪推估其日齡、成長及孵化日。烏魚稚魚耳石成長輪的形成週期約為1天,可用來測定日齡。河口域的稚魚族群由數個加入群所組成,體長範圍為17至39mm,日齡約為29至67天,成長率約為0.45mm d-1。由日齡逆算的孵化日為10月至2月,比外海洄游群的產卵期11月至1月還長。因此淡水河口域的烏魚稚魚可能來自本地及洄遊產卵群,或者可能來自於不同產卵期的洄游族群。 |
英文摘要 | Ages, growth, and hatching dates of grey mullet Mugil cephalus L. juveniles in the Tanshui esturary of northwestern Taiwan were examined, using growth increments in otoliths of fish collected in November 1995 to March 1996 and November 1996 to March 1997. Growth increments are deposited daily, and were used to determine the ages. Juveniles were composed of multiple cohorts, and their sizes ranged between 17 and 39 mm in total length, corresponding to ages of 29 to 67 d after hatching. The growth rate during the estuarine residency was 0.45mm d-1. Hatching dates back-calculated from daily ages were from October to February, which range earlier and later than the spawning period from November to January of a previously known migratory population. This suggests that grey mullet juveniles in the estuary may com from both a resident population and a migratory population, or that there are earlier and later migratory spawning populations. |
本系統中英文摘要資訊取自各篇刊載內容。