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研究報告

更新日期: 2015-02-09
點閱數: 1,324

大西洋熱帶鮪類與太平洋黑鮪資源指標標準化及資源評估研究

年度 2013
計劃名稱 大西洋熱帶鮪類與太平洋黑鮪資源指標標準化及資源評估研究
中文摘要 一、太平洋黑鮪資源生物學與漁業概況 太平洋黑鮪生物學,包括外部形態、分類,分布與生活史,成長,生殖,洄游,仔稚魚及幼魚洄游路徑,生理生態等之描述。兩處產卵場(西北太平洋和日本海海域)存在引發系群評估反映下列議題:幼魚出生地的認定;評估在南西群島產卵場向北迴游的幼魚分開比例;澄清幼魚洄游路徑和環境因子的關係;了解卵、仔稚魚到加入時的洄游路徑;應用數值方法模擬洄游路徑和採用幼魚喜好的游泳方向評估太平洋/日本海的分離比。太平洋黑鮪幼魚沿黑潮流域被捕獲,較小的體型(1-3cm標準長)和中度體型(2-8cm標準長)的幼魚分別在沖繩主島西部和奄美群島海域被捕獲;太平洋黑鮪幼魚沿著黑潮洋流北上洄游,逐漸成長;除外,幼魚如何分離洄游到日本海的機制,尚未清楚。同時,做太平洋黑鮪漁業的描述及最近資源評估之系群狀態展望。   二、大西洋黃鰭鮪資源量指標標準化試驗檢測採用泛線性模式進行台灣鮪延繩釣漁業在大西洋捕撈黃鰭鮪的資源量指標標準化試驗檢測。計算以年、季、次漁區、漁船噸級類別和其雙向交敢為分析因子。在估計資源量指標之前,歷年之漁獲量、漁獲努力量和名目單位努力漁獲量被選定和對其時空分布再檢測。本報告以1990-2011年之資料進行試驗檢測分析。並選定在大西洋熱帶海域(15oN – 20oS)之漁獲量和漁獲努力量,以及參考名目單位努力漁獲量均勻分布,將該選定海域劃分成5各次漁區層級。和線性模式和三角泛線性模式用來標準化黃鰭鮪的單位努力漁獲量。結果顯示,台灣鮪延繩釣漁業捕撈黃鰭鮪的標準化資源量指標,不因模式之不同和不因因子之不同,除有年度位移之外,而有趨勢之差異。和日本延繩釣漁業的標準化黃鰭鮪資源量指標相比較,歷年之趨勢截然不同。
英文摘要 一、Biology and fishery of Pacific Bluefin tuna Biology of Pacific bluefin tuna (Thunnus orientalis) was described including its external morphology, taxonomy, distribution, life history, growth, reproduction, migratory route of larvae and juveniles, and physiological ecology. Two spawning areas (Western North Pacific and the Sea of Japan) were investigated to reflect the problematic evaluation of stock status and issues of identification of birth place, the proportion of migration northward of juveniles from Nasei Shoto waters, the migratory routes of juveniles and the relationship to their environmental factors, the understanding of migration routes from eggs, larvae and juveniles of Pacific Bluefin tuna as occurrence of recruitment, introduction of numerical method to simulate the migratory routes, and evaluation of the separated proportion of juveniles migrated into either side of Pacific Ocean or the Sea of Japan by using the preference of their swimming direction. Pacific Bluefin tuna is harvested along the regime of Kuroshio Current, juveniles of small sized (about 1-3 cm SL) and medium sized (2-8 cm SL) is caught in the waters of western area of Okinawa main island and Amami Islands, respectively. Juveniles of Pacific bluefin tuna grow when they migrate northward along regime of Kuroshio Current. Besides, the mechanism of separation of juveniles into either the Sea of Japan or Pacific side was not known. The report was also dealing with the description of Pacific bluefin tuna fishery and evaluation outlook of stock status assessed recently.   二、Trial estimation of standardized catch per unit effort of yellowfin tuna by Taiwanese longline fishery in the tropical waters of Atlantic Ocean The trial standardized catch per unit effort (CPUE) of Atlantic yellowfin tuna caught by Taiwanese longline fishery was estimated by delta general linear models. For the manipulation, several factors were used including year, quarter, subarea, vessel category and the two-way interactions. Before estimating CPUE, historical catch and effort data were selected and re-examined by spatial and temporal distribution; then the 1990-2011 catch and effort data within the tropical area (15oN – 20oS) were selected and stratified into 5 subareas to make the nominal CPUE homogeneous as possible among subareas. The GLM and Delta-GLM were used to standardize yellowfin tuna CPUE for Taiwanese longline fishery in the Atlantic tropical waters from 1990 to 2011. The results obtained are very similar trend but the displacement of peaks in the series; and different trends were occurred between Japanese longline CPUE series and anyone of the Taiwanese 3 series.
計畫編號 102農科-11.1.1-漁-F2(1)
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