> Mosquitofish were introduced directly into ecosystems in many parts of the world as a biocontrol to lower mosquito populations which in turn negatively affected many other species in each distinct bioregion. Mosquitofish in Australia are classified as a noxious pest and may have exacerbated the mosquito problem in many areas by outcompeting native invertebrate predators of mosquito larvae.
Though:
- It won't stop breeding in other standing water
- Depending on where you live, it could decimate the food source of other animals
- It attacks all mosquito's not just blood suckers
- I understand that there are conflicting reports on its effects on amphibians. I'm not sure how reliable the negative reviews are, or if it is "big citronella" sourced scare, but you may want to be cautious of which water sources you use them in.