The desert pupfish is a small, silvery colored fish with 6-9 dark bands on its sides.
It has an average length of 3.7 cm (1.5 in), with a recorded maximum of 7.8 cm (3.1 in).

The males turn bright blue during mating season, April through October.
The pupfish can withstand harsh conditions that would kill other fish: water that is 4 times more saline than the ocean, hot water up to 116 °F (47 °C), and cold water down to 32 °F (0 °C).
The desert pupfish is a small, silvery colored fish with 6-9 dark bands on its sides. It has an average length of 3.7 cm (1.5 in), with a recorded maximum of 7.8 cm (3.1 in).
The males turn bright blue during mating season, April through October. The pupfish can withstand harsh conditions that would kill other fish: water that is 4 times more saline than the ocean, hot water up to 116 °F (47 °C), and cold water down to 32 °F (0 °C).
Death Valley pupfish