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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25677

Title: 台灣東北部海域耳棘老闆鯆年齡與成長之估計
Age and Growth of Sharpspine Skate, Okamejei acutispina in the Northeastern Waters off Taiwan
Authors: 李姵萱;莊守正;劉光明
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: 耳棘老板鯆;年齡與成長;脊椎骨;多體長頻度分析
age and growth;sharpspine skate;vertebra;MULTIFAN
Date: 2007
Issue Date: 2011-10-20T08:24:58Z
Publisher: 2007台灣水產學會學術論文發表會, 高雄
Abstract: 耳棘老板鯆(Okamejei acutispina)在台灣東北部海域多由底拖網所混獲,因其經濟價值不高,故漁獲後多直接加工做為養殖用飼料。本研究主要針對該海域之耳棘老板鯆進行年齡與成長各參數之估計,以期能提供為資源評估及後續管理所需。年齡形質所使用的樣本係由2006年8月至2007年12月間於宜蘭大溪魚市場按月採得,共計652尾(雌性356尾、雄性296尾)。多體長頻度分析所使用的樣本係由2004年10月至2005年11月以及2006年7月至2007年12月間於同一地點所採集,其中雌性768尾,雄性676尾,共計1,444尾。本研究以脊椎骨為年齡形質進行其成長式推估,依月別邊緣半透明與不透明帶的變化情形推測本種輪紋形成週期為一年一輪,不透明帶於11月開始形成,雌、雄最多可分別讀至12輪及11輪。利用脊椎骨判讀之年齡與體長資料以非線性迴歸推估得von Bertalanffy 成長方程式各參數如下,雌魚理論極限體盤寬(L∞)=37.6 cm,成長係數(k)=0.153 /yr,體盤寬為零時之理論年齡(t0)=-0.53 yr;雄魚為L∞=32.7 cm,k=0.165 /yr,t0=-1.01 yr。50%性成熟年齡雌、雄魚分別為7.2歲及6.8歲。最大觀測年齡雌魚為11歲,雄魚10歲。多體長頻度分析法所得之結果支持年齡形質之結果。
The sharpspine skate, Okamejei acutispina, is the by-catch of trawl fishery in northeastern Taiwan waters and it is regarded as trash fish due to its low economic value. The specimens of sharpspine skate were collected from Dashi fish market, Yilan County. Age determination from vertebral band counting was based on 652 specimens (356 female and 296 male) and verified by length-frequency analysis of 1,444 specimens (768 female and 676 male). Translucent and opaque bands on vertebral centrum were formed once year, and translucent bands were formed in November. Up to 11 and 10 bands were counted for females and males, respectively. The parameters of von Bertalanffy growth equations estimated from vertebral band counting were as the following: asymptotic disc width L∞=37.6 cm, growth coefficient k=0.153/yr, age at zero length t0 =-0.53 yr for females; and L∞=32.7 cm, k=0.165/yr, t0=-1.01 yr for males. The age at maturity were estimated to be 6.9~8.8 yr for female, 5.8~8.9 yr for male. The largest female aged from vertebrae was 11 yr old and the largest male 10 yr old. Length-frequency analysis supported our vertebral ageing estimates.
URI: http://ntour.ntou.edu.tw/handle/987654321/25677
Appears in Collections:[環境生物與漁業科學學系] 演講及研討會

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