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題 名 | 黑潮入侵對臺灣北部海域中層洄游性魚群分布衝擊之初步研究=A Study on the Occurrence of Pelagic Fish School Affected by Intrusion of the Kuroshio Current in Northern Waters of Taiwan |
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作 者 | 廖學耕; 李嘉林; 黃士宗; | 書刊名 | 水產研究 |
卷 期 | 12:1 2004.06[民93.06] |
頁 次 | 頁1-10 |
分類號 | 439.2 |
關鍵詞 | 臺灣北部海域; 魚群密度; 黑潮鋒面; 冷渦; Northern waters of Taiwan; Fish density; Kuroshio current front; Cold eddy; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣東北部為我國鯖?之主要漁場,在春季圍網船集中於黑潮鋒附近作業。但2003年春季,黑潮鋒明顯南移,作業的大型圍網船仍然集結於鋒面邊緣,扒網漁船則於鋒面下方作業,2003年漁獲體長頻度較往年分散。經由CTD探測資料顯示,2002年7月底之冷渦位於25°18' N、 122°18'E,其中心之葉綠素a含量高,可高達14.0 μg/L,經由計量漁探所測得之魚群密度亦顯示在冷渦邊緣具有較高之魚群密度。作業的圍網船集中於冷渦邊緣。2003年7月冷渦位於25°40'N、122°40'E附近,冷渦中心之葉綠素a含量高於邊緣水域,作業船亦集中於冷渦邊緣。1999年2月8 ~ 11日,於25°20'N、120°31'E測站利用CTD所測得的資料發現,水溫小於17℃,鹽度小於33.0 ppt 之江浙冷水覆蓋於溫度大於20℃,鹽度大於34.0 ppt之臺灣暖水上方,經由計量魚探計測測結果顯示,魚群棲息於下方之臺灣暖流內。 |
英文摘要 | The main purpose of this study was to understand and estimate the gathering areas of pelagic fish schools in northeastern waters of Taiwan. The purse seine fishery operates near the area of the Kuroshio Current front during the spring. In this study, we found that the Kuroshio Current front obviously moved southward in 2003, and most of the purse seiners were found operating along the outer edge of the current, while the Danish seiners were operating in the southward area of the Kuroshio Current front. The body length frequency distribution of the catch was larger than those of the last few years. Based on the CTD collected data in this study, we found that a cold eddy was located at 25°18'N, 122°18'E in July 2002, and its concentration of chlorophyll a was high at up to 14.0 μg/L. Based on values of fish intensity using an echo sounder, we also proved that a high density of pelagic fish schools gathered around the edge of the Current front. In July 2003, the cold eddy was located near 25°40'N, 122°40'E, and the concentration of chlorophyll a in the center of the cold eddy was higher than that of the outer layer. During 8 ~ 11 February 1999, the CTD data collected at 25°20'N, 120°3'E showed that Mainland China coastal cold water with a seawater temperature of less than 17°C and salinity of less than 33.0 ppt covered the Current which had a seawater temperature of greater than 20°C and a salinity of greater than 34.0 ppt. We found that the fish schools seemed to inhabit an area of the Taiwan warm water current. In the winter, a strong current of Mainland China coastal cold water running southward along with the northeast monsoon was found at locations west of 122°E. |
本系統中英文摘要資訊取自各篇刊載內容。