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研究生:陳世泳
研究生(外文):Shih -Yung Chen
論文名稱:中西太平洋正鰹漁場推移與表面水溫變異之關係
論文名稱(外文):A study on spatial-temporal distribution of fishing ground of skipjack in association with the surface temperature variability in the Western Central Pacific Ocean
指導教授:呂學榮
指導教授(外文):Hsueh-Jung Lu
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:環境生物與漁業科學學系
學門:農業科學學門
學類:漁業學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:104
中文關鍵詞:中西太平洋正鰹群性聖嬰/南方振盪
外文關鍵詞:WCPOSkipjack tunaschool typeENSO
相關次數:
  • 被引用被引用:5
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  • 下載下載:66
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摘要

聖嬰/反聖嬰現象所導致的漁場環境變異性會影響中西部太平洋(WCPO)正鰹資源的分佈與洄游,本研究乃分析我國鰹鮪圍網漁獲不同成群特性之正鰹魚群量的變動,以了解WCPO近年來的海溫的變異與正鰹漁況的關係。採用的方法為將日別漁獲資料依作業報表所填報之群性區分,分別進行1度方格的網格化處理,彙算不同群性之網格化CPUE資料,再與同範圍內1度方格表水溫資料整合,透過圖像套疊與數值統計,探討表水溫變異對於正鰹漁場推移的影響。主要結果如下:
(一) 1996年以前我國鰹鮪圍網船作業海域,主要分布在165゚E以西,以流木為主,1997年以後開始越過180゚E,作業漁場有逐漸朝東移動的趨勢,素群及FAD群的使用增加。三種群性中素群移動範圍最為廣泛,而流木群與FAD群兩者互為消長,165゚E西側以流木較多,東側以FAD群較多。
(二) 正鰹漁場重心變動主要在經度方向,沿赤道作季節性的移動。因受到ENSO現象的影響而產生年間的變異,漁場經度重心與SOI值呈現高度的相關。三種群性中以素群之移動最為明顯且立即,流木群次之,FAD群則較不明顯。
(三) 1994~2004年作業位置之SST與SSTA統計結果顯示,SST平均值為29.4 °C,顯示漁場位置隨暖池中心移動,SSTA平均值則趨近於0°C,且漁場SST在此期間沒有升高或下降的趨勢。
(四) 以29°C等溫線與1997~2004年三種不同群性(素群、流木群、FAD群)之經度位置進行時序列交叉相關分析,結果顯示均呈正相關,且均在29°C等溫線移動發生一個月以後有最大相關,並以素群最為顯著。



關鍵字:中西太平洋、正鰹、群性、聖嬰/南方振盪
Abstract
The variability of fishing ground caused by El Niño/Southern Oscillation phenomenon greatly affects the distribution and migration of skipjack tuna stock in the Western and Central Pacific Ocean (WCPO). In order to understand the variability of ocean temperature and skipjack tuna fishing condition in WCPO during recent years. We analyze the fluctuation of the skipjack tuna stock biomass using catch data of different schooling types. The daily catch data were classified into three groups according to the schooling types recorded in the logbook, then aggregated into 1 by 1 degree to compute grid Catch Per Unit Effort(CPUE; mt/vessel day). The grid CPUE were integrated with grid (1 by 1 degree) sea surface temperature (SST) data to explore the displacement characteristics of the fishing ground. The major results of the analysis are as follows:

(1)Before 1996, Taiwanese purse seiners mainly operated in the waters west of 165°E primarily targeting log school, then start to cross 180°E after 1997. The fishing ground has a tendency of eastern moves where more free and FAD (Fish Aggregating Device) schools were caught. Among the three school types, the migration range of free schools is the widest. The numbers of log and FAD schools seem to vary mutually with more log sets located west of 165°E and FAD sets mostly in east of 165°E.
(2)The gravity of fishing ground changed mainly in longitudinal direction and seasonal movement were mainly along the Equator. However, the ENSO events would cause inter-annual variability in the gravity displacement showing significant correlation with Southern Oscillation Index (SOI). Among the three school types, the displacement the free schools are the most significant and instant, followed by log and FAD schools, but FAD are comparatively insignificant.
(3)According to the statistics of the compiled SST and SST anomalies (SSTA) in the grids where fishing located during 1994-2004, the mean SST value was 29.4° C suggesting the fishery ground moved along with worm pool center. The mean SSTA value drawing close to 0° C may imply average SST in the fishing ground had no elevated or drop tendency.
(4)Cross-correlation analysis conducted using monthly time series of longitudes of 29°C isotherm and gravities (free, log and FAD schools) shows that all correlation reach significant level (p<0.05) with time log of within one month and free schools are most significant among others.


Key words: WCPO, Skipjack tuna, school type, ENSO
論文章節目次
中文摘要----------------------------------------------------------------------- Ⅰ
英文摘要----------------------------------------------------------------------- Ⅲ
壹、前 言---------------------------------------------------------------------- 1
一、正鰹資源分布與WCPO漁業概況------------------------------- 1
二、台灣鰹鮪圍網漁業概況------------------------------------------ 3
三、正鰹群性與鰹鮪圍網漁法----------------------------------------- 4
四、海洋環境變動與正鰹漁況----------------------------------------- 6
五、研究目的-------------------------------------------------------------- 7
貳、材料與方法-------------------------------------------------------------- 10
一、資料來源-------------------------------------------------------------- 10
二、網格化月別平均CPUE之計算----------------------------------- 10
三、SST及SSTA繪圖與資料檢出----------------------------------- 12
四、正鰹各群性漁場重心及等溫線移動---------------------------- 13
五、時序列交叉相關分析---------------------------------------------- 13
參、結果----------------------------------------------------------------------- 15
一、群性組成及CPUE之時空分布---------------------------------- 15
二、CPUE分布與東西向移動------------------------------------------ 16
(一)漁場重心變動------------------------------------------------ 16
(二)各群性東西向移動與SOI之關係------------------------ 17
三、不同群性CPUE與海表溫變動之關係------------------------- 18
(一)水溫分布移動與變動幅度-------------------------------- 18
(二)漁場重心移動與暖池移動-------------------------------- 19
(三)SST範圍別CPUE分布統計----------------------------- 19
(四)SSTA範圍別CPUE分布統計--------------------------- 20
肆、討論與結論-------------------------------------------------------------- 22
一、WCPO圍網之正鰹漁況變動----------------------------------- 22
二、正鰹漁場之東西向推移現象與海溫變動關係--------------- 23
三、結論----------------------------------------------------------------- 25
伍、參考文獻------------------------------------------------------------------ 28
表-------------------------------------------------------------------------------- 34
圖-------------------------------------------------------------------------------- 35
附錄----------------------------------------------------------------------------- 63
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