We compared the abilities of pupfish, mosquitofish and guppies to control mosquitoes in wastewater marshes. All species of fish reduced mosquito emergence. When fish population densities were similar, fish reduced emergence to similar levels. As experiments progressed, guppies developed greater population densities and provided better mosquito control than mosquitofish, which developed greater densities and better control than pupfish. Fish also reduced numbers of zooplankton, and guppies increased total plant biomass, suggesting fish may influence the ability of wastewater marshes to treat wastewater.
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