* Algae: This is a major food source, especially during the spring when algae blooms occur.
* Insects: They eat both adult insects that fall into the water and their larvae.
* Zooplankton: These tiny animals are found in the water column and are an important food source for the pupfish.
* Diatoms: These single-celled algae are abundant in the Devils Hole pool and are a key food source for the pupfish.
* Small invertebrates: These include ostracods, copepods, and other tiny creatures found in the water.
The Devils Hole pupfish are adapted to their unique environment, and their diet reflects this. The limited food sources available in the Devils Hole pool mean that the pupfish must be efficient feeders and utilize all available food sources.