A steady-state trophic model of the coastal fisheries ecosystems of Brunei Darussalam is derived via ECOPATH II using selected parameters from studies conducted in the area and the available literature. Biomass estimates of various groups so derived are consistent with independent estimates from demersal trawl and pelagic acoustic surveys conducted in Brunei waters. These estimates of biomass combined with fisheries catches give exploitation rates (E) between 0.011 and 0.191, confirming independent assessments which indicate the coastal fisheries resources to be lightly fished. Selected summary statistics relevant to efficiency of the systems are given together with recommendations for research towards refinement of the preliminary model presented.