Mapping the Distribution of Brown Trout in the Contiguous United States Since 1800 Using a Geographic Information System

The purpose of this study was to map the distribution of Brown Trout (Salmo trutta) in the contiguous United States using a geographic information system including geo-spatial data. Since the 1800\u27s the non-indigenous species has derived an important niche in North American ecosystems. With the use of United States Department of Agriculture data, the first recorded observations of the species have been displayed spatially throughout the contiguous United States, alongside their current distribution within the contiguous United States. Brown trout were first observed in the United States in 1800. Since then the species quickly dispersed to many other western states while simultaneously being introduced to Eastern states. With the ability to live and grow in warmer waters, unlike native trout species in the United States, brown trout were able to enter waterways throughout the country and establish a population that is self-sustaining in more than 30 states. Furthermore, brown trout impact native fish populations by competing for resources despite being regularly stocked by wildlife agencies