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Mosquitofish, Gambusia affinis

Mosquitofish, Gambusia affinis, are able to eat large quantities of mosquito larvae. The Vector-Borne Disease Prevention Program employs mosquitofish as an effective biological method in controlling mosquitoes. Our staff will stock mosquitofish in ornamental ponds, detention basins, and slow-moving streams and wetlands.

The following are some of the factors that should be considered before stocking mosquitofish:

  • Is the location a permanent water source?
  • Does the location produce mosquitoes?
  • Do koi or other ornamental fish already exist in the location being considered? (Mosquitofish may be detrimental to such species.)
  • Are predatory fish species such as blue gills present? (Predatory fish will out-compete mosquitofish.)
  • Is the water quality adequate?
  • Does the depth and vegetation provide adequate harborage for the fish?

The Vector-Borne Disease Prevention Program staff is available to assist you determining if your pond is appropriate for stocking mosquitofish. You may call the office at 785-4599 for more information or to request fish for your pond.

Mosquitofish Brochure