Wildlife biologists in Nevada celebrated a win this week with reaching a new high population count of one of the world’s rarest fishes.

Scientists said they counted 187 Devils Hole Pupfish, which is the most they’ve observed in 15 years.

The only natural habitat of Devils Hole pupfish is the upper 80 feet of a cave in Death Valley National Park, adjacent to Ash Meadows National Wildlife Refuge.

Since 1972, the U.S. Fish and Wildlife Service, Nevada Department of Wildlife and National Park Service staff and volunteers have worked together on the official fish count. T

he official result of 187 is the highest count recorded since 2003. Pupfish numbers had dropped to 35 as recently as 2013.