The Belt Transect method is used to conduct fish surveys at Flower Garden Banks National Marine Sanctuary (FGBNMS) in the Gulf of Mexico as part of the National Coral Reef Monitoring Program (NCRMP). The Belt Transect method collects and reports information on species composition, density, size, abundance and derived metrics (e.g. species richness, diversity). Surveys are concurrent with and along the same transect as the Line Point-Intercept (LPI) benthic survey. Data provided in this data set were collected within FGBNMS as part of NOAA National Centers for Coastal Ocean Science (NCCOS)-led missions in collaboration with partners at NOAA National Ocean Service (NOS) Office of National Marine Sanctuaries FGBNMS, NOAA National Marine Fisheries Service (NMFS) Southeast Fisheries Science Center and Texas A&M.