Gambusia holbrooki will, if need arises, switch food sources to survive. With an increase of competition, this species will switch from a diet rich in phytoplankton, algae, and detritus to one consisting of zooplankton, invertebrates, the larvae of many other fish and amphibian species, and plant-associated animals.
Gambusia holbrooki will, if necessary, switch food sources to survive.  This species can shift its diet from one rich in phytoplankton, algae, and detritus to a diet of zooplankton, invertebrates, the larvae of various fish and amphibian species, and animals associated with plants.