Nitrifying bacteria belong to autotrophic bacteria. Nitrifying bacteria preparation is a kind of treatment agent used to control the concentration of autogenous ammonia in aquaculture pond water. It is not only convenient to use, but also immediate, so it is more and more popular among fish friends. When in use, the agent can be directly dispersed in the pool, and the effect of ammonia removal can be quickly exerted.

Autotrophic organisms use carbon dioxide in the atmosphere or carbonate in the environment as carbon nutrition. For example, green plants and a few bacteria are autotrophic, and they can synthesize simple inorganic carbon dioxide or carbonate into complex organic matter for life activities.