Study on Fishing Condition of Mackerel of Danish Seine Operated in Southwestern Waters of Taiwan

臺灣西南部海域扒網之鯖魚漁況研究

王振培(Jeng-Pei Wang) ； 王凱毅(Kae-Yih Wang)

《臺灣水產學會刊》 41卷3期 (2014/09) Pp. 205-221

https://doi.org/10.29822/JFST.201409_41(3).0005

摘要

鯖魚是鯖鰺大型圍網船在臺灣西南海域作業的主要漁獲物，約佔56%，主要漁場是在臺灣沿著200 m等深線附近海域，呈西南走向。而目前在此海域附近捕撈鯖魚最主要的是扒網船，其漁場是在台灣本島和澎湖群島之間，靠近沿岸200 m等深線附近海域。由扒網的資料顯示台灣西南海域的鯖魚以白腹鯖較多，與花腹鯖的比例約82:18。由扒網資料所得的花腹鯖與白腹鯖CPUE以GAM模式分析，顯示與年度、月別、表水溫和底層水深，兩種魚都有顯著的關係，花腹鯖在此模式下可解釋42.6%的殘差，表水溫以24℃來游量最高，28℃以上最低，底層水深以約120 m來游量最高。而白腹鯖在相同模式下可解釋50.3%的殘差，來游量由1997年逐年降低到2001年最低，2002到2006年來游量逐漸增加，2007到2010年又逐漸減少；表水溫以24~25℃來游量最高，底層水深以約120 m來游量最高。由衛星表水溫圖可看出，當大陸沿岸水逼近棚界鋒面，且黑潮支流並未完全消退時，白腹鯖的來游量最高。

關鍵字

扒網 ； 棚界鋒面

並列摘要

Mackerel is the main catch for large mackerel/scad purse seine vessels operated in the waters southwest of Taiwan main catch, accounting for about 56%, its main fishing grounds are in the waters along the 200 m contours from Taiwan with toward southwest direction. Currently in this sea area near the main fishing mackerel is Danish seine, which is proximity to coastal fisheries around 200m isobath waters near Taiwan and the Penghu archipelago. The information indicated that catch of Scomber japonica ratio is more than that of Scomber australasicus ratio and is about 82:18 in southwestern waters off Taiwan. The results obtained from the Danish seine for carrying out the GAM model analysis for CPUE of Scomber japonica and Scomber australasicus indicates that annual, monthly, surface temperature and bottom depth have the significant relationships with both species. Scomber australasicus in this model could explain 42.6% of the residuals, the highest migratory amount in the surface temperature 24℃ while above 28℃has the lowest migratory amount, and the bottom depth of approximately 120 m also has the highest migratory amount. And Scomber japonica in the same model could explain 50.3% of the residuals, the migratory amount gradually decreased from 1997 to 2001, while that increased gradually from 2002 to 2006, but gradually reduced again from 2007 to 2010. The migratory amount is highest in surface temperature about 24~25℃, also highest in the bottom depth of approximately 120 m. From the satellite surface temperature chart shows when the mainland coastal waters approach shelf break front, and the Kuroshio does not completely subsided, Scomber japonica has the highest migratory amount.

並列關鍵字

Danish seine ； shelf break front ； CPUE ； GAM