In this stage, eggs and those that have recently hatched into protolarvae are kept by the mother internally in a gill chamber.

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.

[4][5] Neither species is found north of the White River, flowing east to west south of Bedford, Indiana.

Threats to the species include habitat degradation, especially by groundwater contamination from encroaching agricultural operations, cities and industry, forest loss and surface water impoundment.Behavior The Northern Cave Fish hunts in a special way since it can't see.

It has tiny sensing spots all over its body that can feel when food is swimming nearby, even in complete darkness.