It is necessary to assess the suitability of aquatic houses for effective protection and resource management of the fish population. This study uses the housing evaluation process (HEP) modelling approach to evaluate the suitability of fish habitat in various environmental parameters, including water depth, velocity, substrate type, and cover availability. The HEP model integrates the residence suitability index (HSI) values with the located ecological data to determine the quality and range of houses for targeted fish species. By applying this method to a selected river system, important areas of high and low residence suitability were identified, which provide a quantitative basis for the restoration of habitat, reproduction of species, and flow regulation. The model results were valid against field observations and figures of fish appearance, showing strong compromise and future reliability. This research demonstrates the effectiveness of hep modelling as a decision-support tool in fisheries management and ecological monitoring, contributing to the protection of aquatic biodiversity in the ecosystem of freshwater.