Diel Vertical Movement of the Deep Scattering Layer on the Continental Slope of I-Lan Bay, Taiwan

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  • Chou Shih-Chin
    Department of Fisheries Sciences, National Taiwan Ocean University
  • Lee Ming-Anne
    Department of Fisheries Sciences, National Taiwan Ocean University
  • Lee Kou-Tien
    Department of Fisheries Sciences, National Taiwan Ocean University

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説明

Using the hydroacoustic method with a 38kHz 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 rise at a speed of 1.4-1.7m/min and resided at 180 to 280m in the daytime. It started to ascend ca. 30 min before sun set at a speed of 1.5-1.9m/min and stayed at lO to 150m 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.

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