Gambusia affinis is known for its effectiveness against which stage of mosquitoes?

Gambusia affinis, commonly known as the mosquitofish, is particularly effective against larval mosquitoes. This small fish naturally preys on mosquito larvae, making them an important biological control agent in managing mosquito populations. When introduced into stagnant water bodies where mosquitoes breed, they can significantly reduce the number of larvae present, thereby hindering the development of adult mosquitoes.

Unlike adult mosquitoes or their eggs, which would require different control methods, the larval stage is directly susceptible to predation by Gambusia affinis. This ability to consume larvae helps to interrupt the mosquito life cycle effectively, preventing the emergence of new adult mosquitoes that can spread diseases.

The other life stages of mosquitoes—eggs and adults—are not targeted by Gambusia affinis in the same way. Eggs require significant environmental changes or different control measures, while adult mosquitoes are best managed through various other control methods, not by predation from fish. Hence, focusing on the larval stage highlights the specific role of Gambusia affinis in mosquito control.