Fishes of the upper Trout River, Vilas County, Wisconsin.
The Trout River, a small warm-water river in north-central Wisconsin, contains a rich assemblage offishes over the upper 7.5 kilometers ofits length. The river has at least36 species, 62\% ofthe total number reported for Vilas County. One short stretch contains at least 29 species and another contains at least 25, which is greater than the number encountered at over 99\% of1151 stretches on similarly sized streams and rivers in southern and western Wisconsin. Four of the species found in the Trout River, the pugnose shiner (Notropis anogenus), the greater redhorse (Moxostoma valenciennsi), the northern longear sunfish (Lepomis megalotis pelastes), and the least darter (Etheostoma microperca), are rare in all parts of Wisconsin, while two others, the banded killifish (Fundulus diaphanus) and thefantail darter (Etheostoma flabellare), are rare in north-central Wisconsin. The Trout River should be managed primarily to protect its unusual fish fauna and wilderness characteristics and secondarily to increase its recreational use.