A General Guide for Deriving Abundance Estimates from Hydroacoustic Data





Total Backscatter

Backscatter is presented per unit volume (sv) or area (ABC or sa, NASC or sA).  Do not use the dB scale for calculations.  Depending on survey objectives, these values may be sufficient for desired analyses.  Such analyses would include:

  • average water column backscatter;
  • average depth strata backscatter, or;
  • distribution of backscatter throughout sampling frame.