Disolved Oxygen in The Koi Pond

Oxygen is essential for koi growth, More fish die from a lack of oxygen than any other cause. Koi Keeper should always monitor the actual disolved oxygen in the water every time. Disolved oxygen in the water should 't less than the required by koi fish. Oxygen levels can only be determined by measurement with a water test kit or an oxygen meter like as Ammonia test kit. Submerged plants and algae take oxygen out of the water at night. Their effect can be significant when you have green water in the koi pond. In Warm water koi increased consume oxygen.


During daylight, plants do photosynthesis. This is the reaction of taking in CO2 and expelling O2. Sounds perfect for our pets. But at night, the reverse happens – respiration. The plants take up O2 and expel CO2. So run your pumps 24/7. Do Not Turn Off The Pump At Night, THE KOI’S LIFE DEPENDS ON IT, As the night passes and daylight is on the horizon, the buildup of CO2 is at its highest point. This CO2 combines with the free hydrogen ions in the water and becomes acidic, driving the pH down.
Oxygen Levels in the koi pond

* Warm water saturation is about 8 ppm
* Continuous healthy minimum is about 6 ppm
* Low level stress and poor feeding response 4-5 ppm
* Acute stress, no feeding, inactivity 2-4 ppm
* Death 1-2 ppm
Solution to increased disolved oxygen in the koi pond

Aeration is the term that we use to mean adding air to the water. Since air contains 22% oxygen, aeration adds oxygen to the water. Anything that assists the transfer of oxygen into water could be called an aerator. Add as much air to your pond as you can using air pumps and air stones to distribute the air (highly recommended for ponds that are heavily stocked). You can add the air directly to the pond, the filter, the waterfall and anywhere else you can think of.

Reference:
- Akca Library
- UEKoi