This dataset contains depth integrated abundance of the pearlside Maurolicus muelleri and total water column backscatter, expressed as nautical area scattering coefficient (NASC) determined from acoustics measurements at 38 kHz collected during the cruise B3-2010 of RV Bjarni Sæmundsson southwest of Iceland from 2010-01-26 to 2010-02-04, Marine and Freshwater Research Institute, Hafnarfjörður. This survey was conducted during the experimental fisheries that occurred from 2009 to 2011 to estimate the abundance of the species, and here serves the estimation of the biomass of the species. The associated biological information collected during this survey are contained in an associated file called: “Biological data Maurolicus muelleri-Fisheries data and B3-2010 survey”. Associated biological information contains length distribution per trawl stations, trawl information, date, location, length, weight and age of the fish when available. See Jónsson (2010) for further details on the cruise and a methods description of acoustic sampling.