The SS-DBEM model is a multi-species model that combines a species-based model (DBEM) with a size-spectrum approach (SS) to project spatially (0.5°×0.5°) and temporally (yearly) resolved changes in marine fish species biomass. It incorporates key ecological processes alongside a competition algorithm that allocates energy resources among co-occurring species using ocean environmental conditions from biogeochemical models. The product was created by determining projections for seventeen species under RCP8.5, biogeochemical ensemble model and FMSY (Fishing Maximum Sustainable Yield). Ensemble change fields were winsorized to limit extreme outliers and transformed using a signed log (log1p) to accommodate negative and zero values. Spatial patterns were then smoothed using a 15x15 cell moving average (terra::focal) to reduce grid-scale noise while preserving large-scale trends.