Pest abatement district fights mosquitoes with bluegill

Pest abatement district fights mosquitoes with bluegill

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TWIN FALLS — With the confirmation of the West Nile virus in a mosquito in Twin Falls, the county’s Pest Abatement District is gearing up controls for the blood-thirsty insects.

Mosquito abatement using fish

From left, Kirk Tubbs and Brian Simper, with the pest abatement district, talk about their jobs Wednesday in Twin Falls. Tubbs will be leaving his position to farm full-time.

And first in the line of defense is a tank load of larvae-hungry bluegill from Dierkes Lake, obtained through a special permit through the Idaho Department of Fish and Game.

On Wednesday, pest abatement district manager Kirk Tubbs, who is soon retiring to focus on his family and farm, and Tubbs’ replacement, Brian Simper, netted hundreds of tiny bluegill to plant in potential mosquito breeding grounds.

“Bluegill will get in the reeds and cattails of shallow areas where larger fish won’t go,” Tubbs said as Simper poured a bucket of lake water and bluegill into a settling pond in a Twin Falls subdivision.

Mosquito abatement using fish

Brian Simper, with the pest abatement district, releases some bluegill fish into a settling pond to help control mosquito populations Wednesday in Twin Falls.

In all, 1,000 bluegill will be planted in waterways across the county during the next week.

Mosquitoes breed in bodies of standing water, Tubbs said. Prime habitat for breeding grounds includes what he calls “urban drool” or runoff from business parking lots and residential irrigation.

Each female mosquito can lay 200 eggs that will hatch into an adult in a week, he said.

Mosquito abatement using fish

Brock Palen, with the pest abatement district, checks for mosquito larva Wednesday in Twin Falls.

The fish, planted at a rate of 50 per acre of surface water, “will work nights, weekends and holidays,” Tubbs said, to prevent mosquito larvae from hatching and thereby stalling the spread of West Nile disease.

The common house mosquito, or Culex mosquito, is the primary carrier of West Nile, he said.

While 80% of those infected with the virus experience no symptoms, others can experience mild to serious reactions, including high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis, the Centers for Disease Control and Prevention said. Severe cases can affect the central nervous system, causing encephalitis or meningitis and sometimes death.

The pest abatement district, created about a decade ago by a public vote, has effectively reduced mosquito populations in the county using an integrated pest management plan, Tubbs said. The district uses biological methods such as bluegill and a “soft pesticide” called Bt — Bacillus thuringiensis — that works to control both mosquito and black fly populations before the larvae can hatch into adults.

While the district fights mosquitoes in waterways, “the public has a huge role in the fight” by ridding their properties of standing water, Tubbs said. The pest abatement district strives to educate homeowners about how to join the fight by removing old tires, buckets or kiddy pools that catch and hold rainwater.


In this file photo, Ashley Hahn, with the Twin Falls County Pest Abatement District, puts a mosquito trap at the College of Southern Idaho Fish Hatchery in Twin Falls.

In previous Julys, it was common to find 350 mosquitoes in special traps placed near known breeding grounds, Tubbs said.

“Now that number is under 50,” he said. “That’s a huge reduction. The community put this (district) in place and it’s working.”

Mosquito abatement using fish

Brock Palen, with the pest abatement district, checks for mosquito larva Wednesday in Twin Falls.


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