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Advanced filtration (3)

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Koi pond solid waste. Heterotrophic biological bacteria and solid waste

Solid wastes are largely composed of organic matter. There is some fibre, ash and other inert rubbish in there too that comes as part of the Kois food that it simply cannot digest and which passes straight through its digestive tract into the koi pond water. But the nasty stuff is the organic component of this waste.

Koi ponds & fish pond keeping. Heterotrophic biological bacteria and solid waste

Organic wastes and koi ponds part 2 Organic wastes in the biofilter allow heterotrophic bacteria which feed off these wastes to compete with nitrifying bacteria for oxygen and living space. Heterotrophic bacteria grow a lot faster and can present a danger in that they might significantly deprive the nitrifying bacteria of enough oxygen in order to break down dangerous ammonia via the nitrogen cycle, the cycle of aquatic life. The heterotrophic bacteria in turn produce ammonia as a result of their using the organic wastes as an energy source.

Koi ponds & fish pond keeping. Koi like stability and equilibrium

Oxygen that is available in water to fish can only be accessed once it is dissolved in the water in which the fish live. Whilst water is a remarkable solvent, being able to dissolve almost anything, water can only contain about 9% dissolved oxygen. Compare this to the air that we breathe which comprises our external environment and in which the oxygen content is 21%

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