Fish species occurrence data (HUC12) in Maine, New Hampshire, Vermont, Massachusetts, Connecticut, and Rhode Island

This data release includes the results of state agency led electrofishing surveys conducted in lotic habitats in six states in the Northeastern U.S.: Maine, New Hampshire, Vermont, Massachusetts, Connecticut, and Rhode Island. The following state agencies collected the electrofishing data: Massachusetts Division of Fisheries & Wildlife, Vermont Department of Fish and Wildlife, Vermont Department of Environmental Conservation, Maine Department of Inland Fisheries & Wildlife, Rhode Island Department of Environmental Management, Connecticut Department of Energy and Environmental Protection, and New Hampshire Department of Fish and Game. The survey results are consolidated to a Hydrologic Unit Code (HUC)12 scale and includes surveys from November 1949 through December 2021 with most surveys occurring between 1985 and 2021. Fifty-three species and 24,553 surveys are represented in these data.

These data were analyzed in the manuscript:

Rogers, J.B., G.V. DiRenzo, R.M. Quiñones, T. Richards, A. H. Roy. 2025. Climate and land use drivers of freshwater fish biodiversity in the northeastern United States. Biological Conservation. https://doi.org/10.1016/j.biocon.2025.111337