More than 3,050 species of invertebrates inhabit the benthos of the Barents Sea (Sirenko, 2001). Total fauna biomass, including benthic species, generally increases near the Polar Front, in shallow regions, and near the edges of banks. The richest species diversity is found on sandy silts, and silty-sand floors. Lower biomass occurs in areas with limited upwelling, low primary production, reduced vertical flux, and areas with less suitable substrata caused by heavy sedimentation (e.g. inner parts of glacial fjords).