New fish species discovered in Alabama cave named for TV series monster

There is a new resident hidden in the depths of Alabama, but don't bother grabbing your scuba gear—it lives in a remote, off-limits cave in the northern part of the state. Researchers have officially identified a brand-new species of cavefish, and its name is straight out of the Upside Down.

A Monster Discovery

Matthew Niemiller, a professor at the University of Alabama Huntsville, announced the discovery of the Demon Cavefish, scientifically dubbed Demogorgonichthys arcanus. The specimen was found within the protected confines of Bobcat Cave on Redstone Arsenal in Huntsville.

If the name sounds familiar, that is no coincidence. Fans of the hit Netflix series Stranger Things will recognize the nod to the Demogorgon, the iconic beast from the show. For the research team—who happen to be fans of the series and players of Dungeons & Dragons—it was the perfect fit for a creature dwelling in the mysterious, lightless underworld of an Alabama cave.

Hiding in Plain Sight

The discovery was almost accidental. During a February 2025 expedition, Niemiller took an unexpected tumble into a pool inside the cave, startling a fish in the process. While he initially suspected it was a Southern Cavefish—a species known to inhabit North Alabama limestone caves and the Coosa River system, per the Department of Conservation and Natural Resources—the creature looked distinct once he reviewed his photos and videos.

The Demon Cavefish sports a unique head shape, a noticeable hump behind the head, and lacks pigmented scales, giving it a near-albino appearance. After consulting with collaborators Jonathan Armbruster of Auburn University and Pamela Hart of the University of Alabama, the team determined they had found not just a new species, but an entirely new genus.

Surprisingly, the fish was there all along. When the researchers returned to survey the site, they realized that about half of the fish they encountered in the cave were actually this newly identified species. "It always surprises me when things like this show up, especially in a cave that’s been explored so much," said Armbruster.

The Importance of Our Aquifers

While the Demon Cavefish remains a mystery, scientists are eager to see if it resides in other caves or deeper aquifers. Studying these elusive creatures is more than just a curiosity; it is a vital metric for environmental health. Because these fish live in the water that humans use, their survival is a direct indicator of water quality.

Whether it is the Demon Cavefish, the Alabama Cavefish, or the Alabama Cave Shrimp, these species represent a fragile, complex ecosystem that we are only just beginning to map.

As Armbruster noted, the discovery serves as a humbling reminder of how much of the natural world remains undocumented. "Alabama is tops for freshwater fisheries in the United States," he said. "It’s a place where we’re still making new discoveries… It’s something that’s in process. We’ve made progress, but it’s still far from done."