Right!
The mosquitofish successfully controls mosquito populations, especially in highly altered water systems such as those associated with rice paddies. However, the mosquitofish has also been found to have significant ecological effects because it is such a generalist feeder. Mosquitofish will eat insects and their larvae, as well as fish eggs, fry, and even amphibian eggs and their young. Around the world, mosquitofish have now themselves become targets of biological control!
Links:
