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Mosquito Fish, Friend or Foe? by Bill Templin Mosquito fish (Gambusia sp.) are small fish (1.5 - 2.5 inches) that tolerate a wide range of temperatures and are used as a predator of mosquito larvae in many diverse aquatic habitats throughout the world. With all of the attention being given locally to aerial spraying to control mosquitoes and reduce West Nile Virus problems, mosquito fish just keep on quietly eating the mosquito larvae as many people want them to do. Unfortunately, mosquito fish also eat other living things, which can be a problem in some environments. In fact, some people think that mosquito fish can be a "major pest and in many cases more suitable alternatives exist for mosquito larvae control" (www.gambusia.net). So what should we use for mosquito control if we can't use mosquito fish? Pretty much any fish will eat mosquito larvae. Try finding a mosquito larva in any body of water inhabited by fish. The best thing to use is a native fish found in your local area that is somewhat hardy and will reproduce in the environment that requires mosquito control. Guppies (Poecilia sp.) are also used locally instead of mosquito fish, mainly in koi and gold fish ponds, but they lack the tolerance for temperature extremes. For more information, visit the Sacramento-Yolo Mosquito Vector Control District During a recent tour of the Sacramento-Yolo Mosquito & Vector Control District offices and hatchery facilities, I learned that mosquito fish and guppies are used as biological controls to help reduce the amount of pesticides needed. Mosquito fish are planted in most permanent or semi-permanent water sources but are no longer planted in vernal pools because of their detrimental impacts on fairy shrimp. I also learned that planting is now done only by technicians who are trained in the field. In the past, mosquito fish were handed out on request, which provided less control on their use. I also found that District Manager David Brown (dabrown at FIGHTtheBITE dot net) and his staff are very helpful and eager to work with individuals and groups who may have concerns about any of the District's operations. Consider taking a tour yourself. They will be holding an Open House next spring.
Sacramento Urban Creeks Council |
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