Great Basin Naturalist


One exotic poeciliid (Xiphophorus helleri) and two cichlids (Cichlasoma nigrofasciatum and Tilapia mossambica) are recorded as recently established in thermal springs and their outflows in southern Idaho. Misgurnus anguillicaudatus was collected and is considered as established in the Boise River system. Poecilia mexicana and juvenile hybrid tilapias are recorded from the Bruneau River at Bruneau Hot Springs, Idaho. A reproducing population of X. helleri was found in a spring within the boundaries of Grand Teton National Park, Wyoming. Poecilia reticulata, previously reported from one spring each in Idaho and Wyoming, is recorded from a second spring outflow in Idaho.