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題 名 | Sexual Dimorphism in the Growth Rate of Southern Bluefin Tuna Thunnus maccoyii in the Indian Ocean=印度洋南方黑鮪在成長上的雌雄二形性 |
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作 者 | 林育廷; 曾萬年; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 37:2 2010.06[民99.06] |
頁 次 | 頁135-151 |
分類號 | 439.24 |
關鍵詞 | 南方黑鮪; 耳石; 年齡; 性別; 成長率; Southern bluefin tuna; Otolith; Age; Sex; Growth rate; |
語 文 | 英文(English) |
中文摘要 | 魚類成長的性別二形性是魚類生活史上獨特的策略,為了了解南方黑鮪是否也有此現象出現,本研究則收集南方黑鮪耳石分別取自2003至2004年6到8月間中印度洋攝餌場(共418對)與2005年1到2月間爪哇島附近的產卵場(共197對)。所有的耳石也分別判讀其年齡並利用von Bertalanffy成長方程式推算其成長曲線,再以ARSS法比較雌雄在成長上差異,結果發現南方黑鮪年齡成長在不同的棲地上亦有所差異,取樣自爪哇島附近產卵場南方黑鮪皆是生殖腺成熟的產卵群,年齡與體型明顯大於中印度洋的南方黑鮪(all P values<0.01)。雌魚在成長初期成長較快,但極限體長較小(K=0.109 year^(-1), L(下標 ∞)=192.38 cm and t0=-1.753 years)。雄魚初期雖成長雖較慢,但極限體長卻較雌魚大(K=0.093 year^(-1)-1, L(下標 ∞)=211.66 cm and t0=-1.602 years)。在初次性成熟的年齡約為十歲附近且雌雄尚無明顯差異(P=0.094),但雄魚的體型在性成熟後則是明顯大於雌魚。這也指出性成熟會造成雌雄體型上的差異。南方黑鮪成長的性別二形性則可能是用於成長與生殖能量分配不同所導致。 |
英文摘要 | Sexual dimorphism in growth rate is a special life history strategy of fishes in the evolution of sexual selection. To understand if this phenomenon exists in southern bluefin tuna (SBT, Thunnus maccoyii), the ages of 615 fish were determined from otolith annuli and the length-at-age data of SBTs were fitted by the von Bertalanffy growth equation and the growth rates for each sex were compared by the ARSS method. Otoliths were collected from tuna taken at their feeding ground in the central Indian Ocean (CIO, 29-33°S, 67-91°E) from June to August in 2003 and 2004 (n=418) and from their spawning ground in the adjacent waters of Java, Indonesia (10-20°S, 110-120°E) from January to February 2005 (n=197), respectively. The age and size composition of SBT differed among habitats. All fish collected from Java were sexually mature spawners and significantly larger and older (170.24±9.52 cm in mean (± SD) fork length and 16.51±2.98 years old) than those from CIO (120.07±17.44 cm and 5.83±2.36 years old) (all P values<0.01). Female SBT grew faster but reached a smaller asymptotic length (K=0.109 year^(-1), L(subscript ∞)=192.38 cm and t0=-1.753 years) than did males (K=0.093 year^(-1), L(subscript ∞)=211.66 cm and t0=-1.602 years). The mean age of 10 years of SBT at first maturity did not differ significantly between sexes (P=0.094). Males were significantly larger than females after sexual maturation. Sexual dimorphism in the growth rate of southern blue fin tuna was probably due to tradeoffs in energy allocation between growth and reproduction. |
本系統中英文摘要資訊取自各篇刊載內容。