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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/33904

Title: 以預警法進行台灣沿近海鯊魚漁業管理 (三)
Authors: 王世斌;莊守正;陳哲聰;廖翊雅;劉光明
Contributors: 國立臺灣海洋大學:海洋事務與資源管理研究所
Keywords: 鯊魚;資源評估;漁業管理;預警法
Shark;Stock Assessment;Fishery Management;Precautionary Approach
Date: 2003-01
Issue Date: 2013-07-22T06:38:17Z
Publisher: 行政院農業委員會
Abstract: 摘要:南方澳部份已蒐集1989年至2002年魚種別漁獲量資料,年漁獲量在1,500(1997年)?2,900噸(1996年)間變動,平均約1,900噸。成功部份已蒐集1990年?2002年魚種別漁獲量資料,年漁獲量則在148噸(1998年)?931噸(2000年)間變動,平均約353噸。11艘標本船(2003年1月至6月)填報之漁獲記錄顯示總投鉤數為386786鉤,總漁獲尾數為829尾其中以鋸峰齒鮫447尾為最多(54%),灰鯖鮫(113尾,14%)及深海狐鮫(96尾,12%)次之,釣獲率為2.14尾/千鉤。生活史階段別模式分析之結果顯示,在無漁獲壓力下,淺海狐鮫族群成長率(λ)為1.077、族群內在增加率(r)為0.074。此外,若將自然死亡係數及漁獲死亡係數的隨機變動,加入生活史階段別模式並投射未來10年、20年之族群狀況,顯示族群量將分別增加18.6%與41.9%。模擬不同管理策略的結果皆顯示在現今漁獲壓力下(F = 0.170yr<sup>-1</sup>,開發率E = 58.3%),淺海狐鮫資源應可永續利用;同時對漁獲壓力靈敏度較高的幼魚及成魚階段必須持續地監控,才能確保淺海狐鮫資源之永續利用。
abstract:Annual shark yield of Nanfanao fish market fluctuated from 1500 MT to 2900 MT with a mean of 1900 MT during the period from 1989 to 2002. Annual shark yield of Chengkung fish market fluctuated from 148 MT to 931 MT with a mean of 353 MT during the period from 1990 to 2002. Logbooks from 11 sampling vessels targeting on sharks indicated that catch rate was 2.14/1000 hooks and the blue shark (53.9%), shortfin mako(13.6%) and pelagic thresher(11.6%) are the most common species in catch. Natural mortality of each stage estimated from Peterson and Wroblewski (1984) was as follows: M1=0.155, M2=0.131, M3=0.122, M4=0.113 yr-1 for pelagic thresher shark. The results of stage-based model indicated that the finite rate of population increase λ= 1.077, intrinsic rate of increase r= 0.074 without fishing mortality. The results of stochastic stage-based model indicated that the pelagic thresher stock is increasing under current fishing condition(λ= 1.017、95% C.I.:0.999~1.035) and will increase 18.6% and 41.9% for 10 yr and 20 yr projection, respectively. The stock is sustainable as long as fishing mortality maintains 0.170yr-1 that is exploitation rate E=58.3%. However, this model is highly sensitive to juveniles and adults, which implies that close monitoring on these stages is needed to ensure sustainable utilization of the stock.
Relation: 92農科-9.1.1-漁-F1(4)
URI: http://ntour.ntou.edu.tw/handle/987654321/33904
Appears in Collections:[環境生物與漁業科學學系] 研究計畫
[海洋事務與資源管理研究所] 研究計畫

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