Skip to main content

Coarse Range Maps for Fish Species in the Conterminous United States using HUC8s


Publication Date


Cooper, A.R., Yu, H., Infante, D.M., and Ross, J.A., 2022, Coarse Range Maps for Fish Species in the Conterminous United States using HUC8s: U.S. Geological Survey data release,


This USGS data release documents coarse ranges for 123 fish species in the conterminous United States for level 8 hydrologic units from the Watershed Boundary Dataset (WBD). These range maps were derived by combining known fish occurrence information from four data sources: point occurrences from the Aquatic Gap Analysis Project (AGAP) fish database, point occurrences from the IchthyMaps dataset, point occurrences from the Global Biodiversity Information Facility (GBIF), and HUC-8 level range maps developed by NatureServe. Data can be linked to geospatial units of the WBD using the HUC8 field. Data are provided in comma separated value (CSV) and zipped Parquet file formats. Parquet file format is provided to help facilitate faster [...]


Attached Files

Click on title to download individual files attached to this item.

“Source Data From GBIF (”
10.86 MB text/csv
“Range Data In Comma Separated Value (CSV) File Format”
1.52 MB text/csv
“Range Data In Alternative Data Format (Parquet) For R And Python Users”
169.52 KB application/unknown


These coarse species ranges were developed to support the U.S. Geological Surveys Aquatic Gap Analysis Project (AGAP): Fluvial Fish Native Distributions for the Conterminous United States using the NHDPlusV2.1 and Boosted Regression Tree Models ( analysis. Specifically, these coarse ranges were developed to geographically constrain distribution modeling efforts of fishes throughout the conterminous United States for fish species not currently represented in the dataset Native Ranges of Freshwater Fishes of North America (


Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.

Additional Information


Type Scheme Key
DOI doi:10.5066/P9V390V2

Item Actions

View Item as ...

Save Item as ...

View Item...