The scrutinisation of echograms (allocating quantities of acoustic energy to fish species) is to a great extent subjective. However, it largely determines the outcome and abundance estimation from acoustic survey data. Therefore it is very important that all scientists responsible are following the same general procedures.
WGIPS found that there is a need to compare, evaluate, and harmonize echogram scrutinisation and post-processing procedures currently applied by participants of the 29 pelagic surveys that the group coordinates. Furthermore, there is a need to document recommended methods to be followed in order to produce acoustic density values by species and sampling units from raw (multifrequency) acoustic energy data, and to enact requirements needed for a move to a new database for disaggregated survey data.
The workshop will provide updates on agreed and recommended methods for WGIPS, which will then be published in the ICES Survey Protocol Series (SISP).