The rare fish species only had 37 left, living in Devil's Hole

Devil's hole pupa, also known as devil's pupa, is a small fish belonging to the Cyprinid order Cyprodontidae.

This fish species is considered to have fewer numbers than pandas with only 38 fish remaining in April 2016. after three tourists damaged their habitat.

The rare fish species only had 37 left, living in Devil's Hole Picture 1 The rare fish species only had 37 left, living in Devil's Hole Picture 1

Devil's hole pupa lives in "Devil's Cave", a limestone water cave with a stable temperature at a depth of more than 130m, in an isolated area of Death Valley National Park located between the states of California and Nevada in the US. .

This fish has lived since the Ice Age and was only discovered in 1930 by an American ichthyologist named Joseph H. Wales.

Devil's hole pupa lives at a depth of 24m. Scientists believe that this fish has been living in holes since about 60,000 years ago.

The rare fish species only had 37 left, living in Devil's Hole Picture 2 The rare fish species only had 37 left, living in Devil's Hole Picture 2

Conservation of this fish has become so important, millions of dollars have been spent. And finally, scientists' efforts have brought positive results. By April 2022, the number of devil hole fish pupae at Devil's Cave has increased to 175 fish.

Devil's hole pupa fish are quite small in size with a maximum length of 30mm. Depending on age and gender, they have different colors. Males are bright blue and females are bright yellow. The edges of all the fins of the devil hole pupfish are black, the back and eyeballs (operculum) are metallic yellow. Their irises are blue and also have a metallic sheen.

This fish does not have pelvic fins. Its dorsal fin has twelve rays, and each pectoral fin has seventeen rays.

The rare fish species only had 37 left, living in Devil's Hole Picture 3 The rare fish species only had 37 left, living in Devil's Hole Picture 3

The caudal fin is convex and has twenty-eight rays, curving outward at the edge. The number of scales from the posterior end of the crest to the tip of the tail is 27, with a serrated, or toothed, appearance on the outer edge.

The food of the devil pupa fish is beetles, snails, algae and freshwater crustaceans.

Devil fish pupae breed all year round, usually in spring and fall.

Females have very low fertility, laying only a single egg per spawning session. Eggs also have a very low survival rate.

Devil fish pupae can live for 10 - 14 months. The devil fish pupa, its eggs and young are a favorite food of the predatory diving beetle Neoclypeodytes cinctellus.