Simple definition: Aeration is the process of adding oxygen to pond water, usually by agitating the surface.
Detailed Explanation
Fish and beneficial bacteria both need dissolved oxygen to survive. Aeration methods include waterfalls, fountains, air stones, and pond pumps that break the water’s surface. Warm, still water holds the least oxygen, which is why aeration matters most in summer.
Why It Matters
Without enough aeration, oxygen levels can crash overnight, especially in hot weather or after an algae die-off, putting the whole pond’s fish at risk at once.
Practical Example
Running a pond pump or air stone overnight during a summer heatwave is a common way to prevent an oxygen crash.
