The EFH (Essential Fish Habitat) Mapper is a one-stop tool for viewing the spatial representations of fish species, their life stages, and important habitats. The site also provides links to supporting materials, including fishery management plans, and the ability to download GIS data.

This tool displays maps for essential fish habitat, habitat areas of particular concern, and EFH areas protected from fishing. Users can discover the species that spawn, grow, or live in a selected location on the map and generate a report with supporting documentation. For species with distinct life stages, the map offers locations for each individual stage.