FLEET DYNAMIC ANALYSIS OF THE TAIWAN OFFSHORE TRAWL FISHERY: AN APPLICATION OF THE SEA SURFACE TEMPERATURE MEASURES

臺灣近海拖網漁船船位動態分析—海水表層水溫資料之應用

孫金華(Chin-Hwa Sun) ； 江福松(Fu-Sung Chiang)

《Journal of Marine Science and Technology》 7卷2期 (1999/12) Pp. 101-109

https://doi.org/10.6119/JMST.199912_7(2).0005

摘要

本文主要是應用臺灣沿近海衛星海水表層水溫影像資料和漁船船位資料，期能完整紀錄及掌握拖網漁船在不同時點下的動態，並研究近海拖網漁船在不同時點和作業漁區的空間選擇行為，進而探討拖網漁民有關動態漁區選擇行為的趨勢，研究結果顯示隨著不同季節海水表水溫的改變，拖網漁船漁撈作業的船位分佈亦顯著的不同。此外，針對不同漁場別各年間分配比率之Wilcoxon符號檢定的結果，可看出漁船明顯地集中於漁區C，但1995及1996年作業天數比率顯著下降，可能是因為該區域漁業資源的枯竭速度較其他區域來的快，無法滿足漁撈業者維持相同的投入水準。值得注意的是日本與中國大陸1997年所簽訂「日中漁業協定」，劃定臺灣拖網漁業傳統漁區(漁區C)為暫定措施水域，值得未來更新動態資料庫，及進一步評估其對台灣拖網業的影響程度。

並列摘要

The overall goal of this paper is to provide important information documenting and analyzing Taiwan’s trawl fishing fleet activities in the northeastern of Taiwan. Seasonal SST data are used to analyze different seasonal fishing patterns and the density of fleet dynamics of offshore trawl fleet is used to identify five distinct fishing areas(A,B,C,D, and E)in the northeastern of Taiwan. A Wilcoxon sign testis used to examine the variability in the percent of days spent in each fishing area from 1993 to 1996.Results show that a significant portion of trawl vessels have shifted from the most important fishing area C to other areas during 1995 and 1996.Fishing area C may not be yielding sufficient harvests to warrant previous fishing levels, something that could be caused by stock depletion, which is more pronounced in area C than that in other areas. It is of interest to continue monitoring whether or not the fleet movement dynamics in area C will be influenced by the “Sino-Japan Co-Management Zone, ”which was declared by Mainland China and Japan in 1997.Continuingupdating database and further research are desirable in the future.

並列關鍵字

Trawl fisheries ； Fleet dynamics ； Sea surface temperature(SST) ； Wilcoxon sign test ； Fisheries management