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“Soft” chemical insecticides, such as the insect growth regulator methoprene, are toxic only to insects and other arthropods. It is not hazardous to nontarget organisms but can reduce midge populations that serve as fish food. Bti is toxic only to mosquito and midge larvae. Microbial insecticides, especially the bacterial product known as Bti (Bacillus thuringiensis israeliensis), can be as effective as chemical insecticides. Consult the Colorado Division of Wildlife restrictions and regulations on Gambusia before using this mosquito control method. Mosquito fish have to be released annually in habitats that do not have year-round water. Although Gambusia are not used extensively in Colorado, some strains can survive our climate and become effective long-term controls of mosquito larvae in some habitats. Gambusia feed on many kinds of insect larvae, but prefer wrigglers and other top feeders. The mosquito-eating fish Gambusia (closely related to guppies) can be reared in large numbers and released in mosquito breeding sites.
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