Brook trout current probability of occurrence is based on a model developed by Ben Letcher and associates at the USGS Conte Anadromous Fish Lab. It is an index applied to headwater creeks within the watershed, and is analogous to the landscape capability index used for the terrestrial wildlife species in that it represents current habitat suitability. It is applied at the scale of small catchments associated with a given stream segment, rather than 30m cells as used for terrestrial wildlife. This index is used to generate the aquatic core area selection index.
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Read the Technical Abstract for this data layer (brookTroutLc.shp).