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|Title: ||利用耳石切片與重量探討臺灣西南海域產大頭白姑魚Pennahia macrocephalus之年齡結構與成長|
Age structure and growth of big-head pennah croaker, Pennahia macrocephalus in the southwestern waters off Taiwan: an approach using both thin-section and weight of otoliths
|Authors: ||Ahmad Naufal Attaqi|
|Contributors: ||NTOU:Institute of Marine Affairs and Resource Managemen|
Age and growth;Pennahia macrocephalus;otolith weight;southwestern waters off Taiwan
|Issue Date: ||2020-01-20T06:08:01Z
|Abstract: ||本研究利用耳石切片與重量探討臺灣西南海域產大頭白姑魚(Pennahia macrocephalus)之年齡結構與成長。採樣期間為2010年5月至2011年10月，樣本數共計1874尾，其中雌魚1088尾、雄魚764尾、無法辨識22尾。本種標準體長(SL)與體重(BW)的關係式雌雄之間並無顯著差異(ANCOVA, P>0.05)，故可以BW=0.0430SL2.7474 (n = 1874, P<0.05)表示。根據邊緣成長率分析顯示，本種耳石輪紋每年形成一輪，形成期在每年的9月至11月間；雌雄魚之輪紋數最多均可讀至5輪；本種依反推算法所估算之von Bertalanffy成長方程式為SLt=18.48(1-e-0.3735(t+1.1316)),而非線性法所得則為SLt=17.82(1-e-0.3706(t+1.8678))。本種耳石重量隨年齡持續成長，與年齡的相關性高於體長及體重與年齡之關連，顯示耳石重為一預測年齡的良好參數。而各月份、各年齡群個體之年齡可依其體長、及該年齡群於該月份體長頻度分佈之眾數，與該個體計算所得之等效耳石重量(We)來加以預測。結果也顯示，各月份估算所得之各年齡別的We可以合理的區隔，也因此提供本種年齡結構估算的另一簡易方法。本研究上述所得不僅提供了大頭白姑魚一個簡單且快速的鑑齡方法，亦將提供本種未來資源評估與管理的重要依據。|
Age structure and growth of the big-head pennah croaker, Pennahia macrocephalus in waters off southwestern Taiwan were examined based on both thin section and weight of otoliths from samples collected between May 2010 and October 2011. In total, 1874 samples including 1088 females, 764 males and 22 unidentified individuals were collected. There was no difference (ANCOVA, P>0.05) found between sexes on log-transformed body weight (BW) and standard length (SL) relationships, thus a combined equation of BW=0.0430SL2.7474 (n = 1874, P<0.05) was presented. The annulus of the otolith was formed once per year, and in a period between September and November based on marginal increment ratio analysis. The maximum ages for both sexes were estimated to be 5. The von Bertalanffy growth equations (sexes combined) estimated by the back-calculated method was SLt=18.48(1-e-0.3735(t+1.1316)), while it was SLt=17.82(1-e-0.3706(t+1.8678)) based on the nonlinear method. The otolith weight (OW) continue to grow with ages, and has a higher correlation with age than those of SL and BW, indicating that OW could be a good predictor of age of the species. Prediction of individual age by otolith weight was developed using the equivalent otolith weight (W_e) of individual at any length of a specific age group and month, and their corresponding modal length. The estimated We for each age group in any month appeared to segregate different age classes reasonable well, and permits a greater potential for easy estimation of age structure of this species. The results presented here provide not only an easy and fast method for identification of age of P. macrocephalus, but also important information for future stock assessment and management of the species.
|Appears in Collections:||[海洋事務與資源管理研究所] 博碩士論文|
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