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研究報告

更新日期: 2012-01-04
點閱數: 1,636

衛星遙測應用於印度洋黃鰭鮪漁況變動特性研究 (II)

年度 2006
計劃名稱 衛星遙測應用於印度洋黃鰭鮪漁況變動特性研究 (II)
中文摘要 本研究之95年度執行進度主要以印度洋第1區之阿拉伯海及第2漁區為分析範圍,蒐集1997-2004年我國印度洋鮪釣漁船黃鰭鮪的魚獲統計資料,以及海洋表面水溫、海洋水色與海面高度、降雨量等衛星遙測資料,並且利用GIS系統整合以探究黃鰭鮪的魚場分布變動的特性與海洋環境因子間的關係。結果顯示阿拉伯海及第2漁區兩區歷年漁獲量分別占印度洋總漁量的27.2%及54.9%,而單位漁獲努力量(CPUE)方面則顯示印度洋全區之平均CPUE為2.39尾/千鉤,其中在第一漁區有較高的CPUE值,平均為6.99尾/千鉤,且漁獲季節主要集中於每年的2-7月,CPUE值最高為每年4月,第2漁區的CPUE平均為2.82尾/千鉤,並且呈現季節變動的特性。而以主成分分析黃鰭鮪魚況與海洋環境因子間的關係,結果顯示CPUE與海水表面平均溫度,湧昇面積大小,100公尺深之溫鹽,流場,降雨量以及葉綠素濃度有高度之相關性,而海水溫度的上升與趨於穩定的海況使得黃鰭鮪漁獲量及CPUE有正向之變動趨勢,顯示其CPUE與海洋環境因子間有明顯之季節變動。
英文摘要 Yellow-fin tuna is one of an important target fish of tuna long line fishery in the Indian Ocean, distributes widly in the north sea of 10 degrees south latitude mainly. This study collected the fisheries-based data of yellow-fin tuna and satellite-derived data, includes Sea surface temperature (SST), ocean color, Sea surface height and precipitation images in the Indian Ocean during the period of 1997-2004. GIS system is used to combine this data set in order to investigate the relationship between the distribution of yellow-fin tuna and the oceanic environmental factors. The catch data shows that sub-area 1 and 2 are the most important areas in the Indian Ocean, the catch percentage in these two areas are 27.2% and 54.9% respectively. In addition, the CPUE shows that the averaged CPUE of whole Indian Ocean is 2.39(inds/1000 hooks), and there is higher CPUE value in sub-area 1 of 6.99(inds/1000 hooks). In sub-area 1 the fishing season is from February to July, and in April the value is the highest. The CPUE in sub-area 2 is 2.82(inds/1000 hooks) and it shows a seasonality variation. After Principle Component Analysis (PCA) analyzing, the results shows high interrelated between CPUE, SST ,upwelling area, water temperature and salinity in the 100m depth and chlorophyll-a. Further, high catch and CPUE of yellow-fin tuna are appeared with the increasing of stability oceanic condition and SST. It also reveals a seasonal evolution of CPUE and oceanic condition in the Arabian Sea.
計畫編號 95農科-14.1.2-漁-F2(2)
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