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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39533

Title: Diel vertical movement of the deep scattering layer on the continental slope of I-Lan Bay, Taiwan
Authors: Ming-An Lee;Ming-Hsiu Chao;Jinn-Shing Weng;Yang-Chi Lan;Hsueh-Jung Lu
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Date: 1999-10
Issue Date: 2016-12-16T08:01:35Z
Publisher: Fisheries Science
Abstract: Abstract:Using the hydroacoustic method with a 38 kHz scientific echo sounding system, the diel vertical movement of the deep scattering layer (DSL) in I-Lan Bay, northeastern Taiwan, was studied on April 13-15 and June 12-14, 1997. The DSL started to descend about 30 minutes before sun set at a speed of 1.4-1.7 m/min and resided at 180 to 280 m in the daytime. It started to ascend ca. 30 min before sun rise at a speed of 1.5-1.9 m/min and stayed at 10 to 150 m at night. Plankton samples were simultaneously collected by an IKMT sampler to determine the species composition. The dominant species (ca.>1.5cm) were Sergia lucens and Pasiphaea japonica, which made up 89.3% of the catch. The mean packing density during the daytime was about 3 times higher than that at night.
Relation: 65(5), pp.694-699
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39533
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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