Abstract
Freshwater sculpins represent a diverse but poorly-understood constituent of the Holarctic ichthyofauna. Sculpins are considered sensitive to pollution and habitat change, serving as aquatic bioindicators in ecotoxicology. Many species are protected by conservation agencies, due to anthropogenic activity within restricted geographic distributions. Here, we provide the first complete mitochondrial DNA sequences for three freshwater sculpins (Cottus asper, C. perifretum, C. rhenanus). These data are used to infer an updated mtDNA phylogeny for the genus Cottus, which supports results of previous research. These data are likely to be useful for future studies in biogeography, conservation, and functional genomics.