The northern cavefish or northern blindfish (Amblyopsis spelaea) is found in caves through Kentucky and southern Indiana. It is under review for possible listing under the Endangered Species Act of 1973 in the United States as of 2023, and the IUCN lists the species as near threatened.
During a 2013 study of Amblyopsis spelaea, scientists found that the species was divided into two distinct evolutionary lineages: one north of the Ohio River, in Indiana, and one south of the river, in Kentucky. The southern population retained the name A. spelaea and the northern was re-designated Amblyopsis hoosieri in a 2014 paper published in the journal ZooKeys. Neither species is found north of the White River, flowing east to west south of Bedford, Indiana.
- NatureServe (2014). "Amblyopsis spelaea". IUCN Red List of Threatened Species. 2014: e.T1080A19034608. doi:10.2305/IUCN.UK.2014-3.RLTS.T1080A19034608.en. Retrieved 19 November 2021.
- "Northern cavefish (Amblyopsis spelaea)". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 13 April 2023.
- Chakrabarty, Prosanta; Prejean, Jacques A.; Niemiller, Matthew L. (May 29, 2014). "The Hoosier cavefish, a new and endangered species (Amblyopsidae, Amblyopsis) from the caves of southern Indiana". ZooKeys. Pensoft (412): 41–57. doi:10.3897/zookeys.412.7245. PMC 4042695. PMID 24899861. Retrieved January 23, 2015.
- Howard, Brian Clark (May 30, 2014). "Blind Hoosier Cavefish: Freshwater Species of the Week". National Geographic. Archived from the original on December 7, 2014. Retrieved January 23, 2015.