Devils Hole Pupfish Spring Season Population Counts Highest in 22 Years

Fish biologists are excited to report increased numbers of one of the world’s rarest fishes. Scientists counted 175 Devils Hole pupfish, which is the most they’ve observed in a spring count in 22 years. This momentous count also marked the 50th anniversary of counting pupfish using SCUBA, dating back to April 6th, 1972.

Devils Hole pupfish (Cyprinodon diabolis) live in the upper 80 feet of a deep water-filled cavern and sun-lit shallow pool at the cavern’s entrance, making this the smallest range of any vertebrate species on the planet. Devils Hole is a detached unit of Death Valley National Park adjacent to Ash Meadows National Wildlife Refuge in Nye County, Nevada. U.S. Fish and Wildlife Service, Nevada Department of Wildlife, and National Park Service staff cooperate to manage this critically endangered species.

Population size is estimated by counting fish throughout its habitat, with standard counting protocols. Scientists SCUBA dive to count fish in the cavern, starting at depths below 100 feet. Simultaneously, other scientists count fish on the shallow shelf at the waters’ surface. The final count includes both surface and underwater fish.The official result, 175 observable pupfish, is the highest count recorded in 22 years.

Before the 1990s, the population was around 200 pupfish in the spring. However, pupfish numbers have been especially low during the last two decades, averaging only 90 fish.

A return to higher numbers of pupfish this time of year could signal important changes in the ecosystem.Kevin Wilson, Aquatic Ecologist for Death Valley National Park, manages resources of Devils Hole, and states “such shifts highlight the importance of maintaining long-term data as we work to find out what’s changed.”

The official result, 175 observable pupfish, is the highest count recorded since April 2000.  On this count, Brandon Senger, Supervising Fisheries Biologist for Nevada Department of Wildlife, scuba-counted a surprising number of young fish below the surface. For biologists at Devils Hole, it’s always great to confirm spring reproduction coming out of winter. Other biologists on site noted fish appeared both in remarkable condition, and very active.

Having more pupfish in Devils Hole also affects the direction and focus of species recovery. This week’s count continues an overall springtime increase over the last 9 years from the all-time low of 35 fish. Michael Schwemm, Senior Fish Biologist for the US Fish and Wildlife Service, states “it’s exciting to see this shift, because if persistent, allows more opportunity for study and to explore new management options.” The next pupfish count occurs next fall.

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Robert
Robert
5 months ago

“it’s exciting to see this shift, because if persistent, allows more opportunity for study and to explore new management options.” I think they mean it secures the tax eating biologist job gravy train. New management options allows expansion of the tax eating gravy train to more biologist.

David Dennison
David Dennison
5 months ago
Reply to  Robert

Yes,Robert The hell with the environmental studies,it’s wildlife and ways to secure it for generations to come. Life,it’s ALL about money…how to make it….how to save it…how the Government spends it. And then whine and complain about “tax money” and how they use it,when they could be doing things with… Read more »

Pine
Pine
5 months ago
Reply to  Robert

Robert,
One can imagine what Owens Valley/Mono Lake would be like without biologists keeping an eye on LADWP/SCE. Tax eating gravy train? Only LADWP biologists make good money, and they get paid well to turn a blind eye.

David Dennison
David Dennison
5 months ago
Reply to  Pine

Pine Oh,the stories one ( some,anyway ) could tell about the LADWP,as well as others ( ” authorities and County officials ” ), turning the “blind eye” to rules and procedures WE are supposed to follow and obey,but can quickly be over-ridden with the passing of a few $$$ here… Read more »