Fish Food

By · Friday, October 30th, 2009

Fish Food

Be careful when feeding your Koi. Even if you buy the best food for koi, if you feed too much of it will ruin the water quality in the pond Koi fish and make sick!

Koi ammonia to the food they eat. In fact, some people even refer to them as ammonia machines. The reason for this is because the amount of food they eat. Being gluttons for consumed nearly everything in its path!

– The ammonia is excreted in several different ways:
– The process of digestion (which includes both the feces and urine)
– Respiration (introducing ammonia through their gills)
– Food not consumed (which breaks down into several chemicals including ammonia)
– Sediment from the pond bottom (including feces, dead leaves, plant material into a pond of dead bodies and others)

Although you can feed the koi fish food better to try to keep your fish healthy, if not near the water in your pond and keep scrupulously clean Koi Pond fish will be sick. Water quality is the most important factor in the disease Koi.

There are ways to calculate the amount of ammonia generated by the Koi food. It will not be accurate, but give a rough estimate. It is based on the weight of food fed daily and the percentage of protein in food.

By multiplying the weight of the food by the percentage of protein in the food and then by the percentage of nitrogen in the protein (typically 16%) is the atomic weight of nitrogen goes into the water.

So if you know the volume (and thus weight) of water in the pond you can find the hours of nitrogen.

Nitrogen produces ammonia and creates ammonia nitrite.

Every day, in a typical pond 1.9 ppm to 5.2 ppm ammonia and nitrite is produced. By measuring the amount of ammonia and nitrite effectively (with proof of pond water), the difference is amount of "digested" by the bacteria per day.

If no bacteria are present in the pond to digest the ammonia and nitrite, and does no water changes, then the concentration of ammonia increased by 1.9 ppm per day and nitrite to 5.2 ppm per day.

If this happens your Koi die fairly quickly due to the toxicity of ammonia and nitrite. After just one or two weeks of life in the water with 20 ppm of ammonia or nitrites most your koi are dying and who are still alive will Columnaris and Aeromonas infections and worse.

So be sure to keep bacteria levels beneficial in the pond and test your pond water regularly. If water quality is not up to snuff no matter if you are the best koi fish food!

If you would like more information about the best Koi fish food and how to create and care for a healthy and beautiful Koi pond visit

The author, Alan Deacon is a long time Koi enthusiast and Koi expert.

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