Comparision of acoustic detection descriptors of Anchovy in Korean Waters

           Zang Geun KIM, Young Min CHOI, Cha Soo Park and Young Seup KIM 
            National Fisheries Research and Development Institute (NFRDI)
 
          408-1 Sirang-ri, Kijang-eup, Kijang County, Pusan, 619-900, Korea 

     Echo integration provides a useful information  vital for fisheries management. It 
is  reported that  echo  shape from  fish  school varies  according  to biological  and 
physical condition of waters where the school is located. 
     Using the  data collected in  the esat-southern coastal  waters of Korea,  March 
1995,  morphological,  spatial  and temporal  descriptors  of  acoustic  detection  from 
Anchovy was analysed.
     2,347  anchovy shoals  detected were  reanalysed  to describe  the morpological, 
bathymetric and energetic characteristics.  Differences in shoal descriptors were found 
between bathymetric layers and regions.  Mean length of shoal was 20.1m, 13.4m and 
mean height  of shoal  was 5.4m, 12.4m,  respectively in March  and November.  The 
largest one reached 184m in length and 57m in height.