In the Barents Sea, extensive aggregations of sponges are known to occur, especially in the southwestern portion dominated by large species of Geodia spp. The distribution of deep-sea sponge grounds, considered vulnerable marine ecosystems, often coincides with high fishing efforts targeting demersal fish species and benthic invertebrates using bottom trawls. The aim of this study was to ... [Show full abstract] investigate the effects of bottom trawling on the abundance of structure forming Geodia spp., size composition of Geodia barretti together with functional and species diversity of associated fauna. Using images collected by a Remotely Operated Vehicle, we compared two locations with contrasting levels of trawling effort. We found significantly smaller Geodia barretti in the intensely trawled area as well as differences in species and functional diversity between the two sites. This study provided clear evidence that bottom trawling significantly alter sponge associated communities, significantly reducing the abundance and size of geodiid sponges, and creating a shift in functional diversity. The effects of bottom trawling on Geodia barretti and Geodia spp. Grounds are noticeable and results should be used in conservation and management of these diverse sponge grounds.