They have been dubbed by scientists as “one of the most problematic animals on the planet”.
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.
This is my second time trying to raise them. About 10 years ago, they were far too nippy to have tank mates of other species. But this time it’s just them alone. Such curious little fish.