Fish eradication is the targeted removal of invasive or non-native fish species from a defined water body or watershed to restore native aquatic ecosystems. As a GIS use case, it leverages spatial analysis and geospatial data to plan, execute, and monitor eradication campaigns with precision and efficiency.

GIS technology supports fish eradication efforts by enabling analysts to map watershed boundaries, model water flow connectivity, and identify treatment zones where piscicides — such as rotenone — will be applied. Hydrological network analysis helps determine upstream and downstream barriers, preventing treated areas from being recolonized. Geospatial data layers, including bathymetric surveys, habitat classifications, and water temperature gradients, inform chemical dosage calculations and treatment timing. Field teams utilize mobile GIS applications to collect real-time location data, log treatment progress, and flag environmental sensitive areas requiring special protocols.

The practical benefits include reduced operational costs through optimized resource deployment, improved regulatory compliance via documented spatial records, and enhanced collaboration among fisheries managers, environmental agencies, and tribal stakeholders. Ultimately, GIS-driven fish eradication supports long-term biodiversity restoration and ecosystem health monitoring.