Kenyan Fish Researchers in Kenya have found that a fish could be an effective weapon in the fight to reduce the spread of malaria. A fish that is normally eaten was introduced to several places in the west of the country. The fish eats mosquito larvae, that are young mosquitoes before they have wings. People have known for a long time that this fish eats mosquitoes, but this was the first time that researchers had looked at how the fish could be used to control malaria, which made 300 million people ill and causes a million deaths worldwide every year.