A process by which air is circulated through water, usually through movement or air stones, is called?

• A. Aeration
• B. Chemical filter
• C. Biological filter
• D. Mechanical filter

Answer: (A)

Aeration is the process of circulating air through water to increase dissolved oxygen. In aquaculture, air is often introduced with movement or air stones, creating bubbles that dissolve oxygen into the water and promote mixing. This boosts oxygen available for fish and beneficial microbes, helps prevent stratification, and supports overall water quality. It’s different from filters: a chemical filter removes dissolved contaminants, a biological filter houses bacteria to break down ammonia, and a mechanical filter removes physical particulates. The description of introducing air and moving it through water best fits aeration, which is essential for maintaining healthy oxygen levels in the system.