Contra Costa County Mosquito and Vector Control District technician Christopher Doll releases a bag of Gambusia affinis, better known as 'Mosquito Fish' into the water of a neglected pool at a foreclosed home April 9, 2009 in Concord, California. Unseasonably warm weather for Northern California in January appears to have brought female mosquitos out of hibernation and have started to breed months ahead of the normal breeding season. Several groups of mosquitos found in a marsh near the Contra Costa County town of Martinez have tested positive for the West Nile Virus prompting county officials to do more testing and releasing mosquito fish in abandoned pools around the county.
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