200KHz ギョグン タンチキ ニヨル カゴシマワン ニオケル D.S.L. ノ キロク ニツイテ

The observation was carried out on board the Nansei-maru, Faculty of Fisheries Kagoshima university, in the northeastern area of the Kagoshima Bay in august, 1973. The results of the observation was summarized as follow: (1) Deep scattering layer (DSL) was detected by 200 KHz Fish-finder and it was consist of 3 layers. (2) These layers changed their depth diurnally, and vertical movement of the 3 layers of DSL varied in response to the submarine illumination. (3) The velocity of descending or ascending movement of DSL at the sunrise or sunset was recorded as fast as 1~2 m/min