... At present, we have succeeded in forming two types of nanobubbles, namely, ozone and oxygen nanobubbles. Although ordinary ozone can only exist in water for a very short time (on the order of several tens of minutes), ozone can be retained for several months when supplied in the form of nanobubbles. Oxygen nanobubbles have an extremely high bioactivity effect, for example, making it possible to raise freshwater fish and marine fish simultaneously in the same environment (see figure). ...