If mosquitoes are found to be breeding in other treatment plants in the city, the fish will be called to dinner at those plants.
The mosquito originated in Africa but is now found in tropical and subtropical regions throughout the world.
"There is probably less risk at the beach, but you can't be sure, because the mosquitoes have been found even near the big tourist hotels."
They said this was not surprising given that mosquitoes carrying the virus were found two counties to the east last year.
The mosquito can be found in citrus furrow irrigation systems in coastal southeastern Florida.
No infected mosquitoes have been found in the county, and the five infected birds found were more than two miles apart.
Dengue mosquitoes are most often found near human habitation.
The oldest known mosquito with an anatomy similar to modern species was found in 79-million-year-old Canadian amber from the Cretaceous.
He lived in a part of the Bronx where mosquitoes carrying the disease had been found, and had probably been infected by a bite.
It has a short flight range (less than 200 m), so breeding sites are likely to be close to where this mosquito is found.