View Larger Image © David Ostendorf
Gulf Coast States and Southern Mississippi River
W. Mosquitofish are typically dull grey or brown. They have a flattened head with an upward pointing mouth, and a rounded tail.
These fish are extremely aggressive and can cause drastic reductions in small native fish populations. Some studies show they may benefit mosquito populations.
W. mosquitofish were initially introduced in many areas to control mosquito populations. It was believed that they would consume more mosquito larvae than native species; however it was found that they are less effective at mosquito control than native fishes.