Goldfish for Mosquito Control in Stock Tanks


Life and Adventures at Diamond W RanchThe mosquitoes are terrible around our area this year. With the threat of West Nile Virus and Zika Virus lurking in the news and coming across my desk as a health department nurse, I am doing my best to be vigilant in protecting my family (and my animals) from getting bitten.

However, another thing we can do as livestock producers is to try to reduce the availability of breeding grounds for mosquitoes. Mosquitoes must have still or stagnant water in which to lay their eggs. Common areas around the home are flower pots, old tires, buckets, animal water bowls, tarps or swimming pool covers, and livestock tanks. It is fairly easy to control standing water in most of these items, but dumping and refilling large stock tanks is a big chore, and not very easy to maintain, especially since mosquitoes can go from egg to adult in less than a week.

The solution I have found is to employ goldfish. Goldfish are wonderful tank cleaners! They keep my tanks cleaner longer and they eat mosquito larvae! Every summer I go to the pet store and purchase a bunch of feeder goldfish, which are usually less than 20 cents each. I divide them among my livestock tanks and let them work all summer. The tanks I have are mosquito-larvae free!

Goldfish employees ready for work

I did this earlier this year, about a month ago. But I only purchased about 15 goldfish, and put them in two of my four stock tanks. The two tanks with goldfish were completely free of ANY mosquito larvae. The other two were disgustingly (and literally) SWIMMING with the little blood-suckers-to-be. I quickly went back to the pet store and purchased 30 more goldfish and divided them into the other two tanks. For less than $6.00, I have mosquito control all summer long. And, within 24 hours, the goldfish have the tanks almost 100% free from mosquito larvae already!

Goldfish into the tank

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