San Joaquin County Mosquito and Vector Control District (District) will be distributing mosquitofish free to residents of all cities and surrounding rural areas within San Joaquin County. “Mosquitofish play an important role in mosquito prevention. They are used for existing water sources including ornamental ponds, abandoned or neglected swimming pools, water features, and animal water troughs,” said Aaron Devencenzi, Public Information Officer with the District. “This event is held during National Mosquito Control Awareness Week,” said Devencenzi.