A clay pond, also known as a mud pond, is widely thought to be a key means to nurturing some of the finest variety of koi in the world. Even though our own koi live in ponds with crystal clear water clarity and very filtered water, the reality is that we keep them in this environment for our own advantage – so that we can take pleasure in seeing them and admiring their beauty.
The Niigata koi farmers, however, breed some of the healthiest and most colourful koi in mud ponds that are cut out of the earth. These ponds are naturally rich in minerals, while the water clarity remains cloudy as the koi scavenge in the muddy top layer. Far from being filtered, these ponds are in fact enriched with manure.
Fortunately, we can reach a compromise between the water clarity we desire and the optimum mineralised conditions of the Niigata clay ponds. It simply involves you adding a clay like montmorillonite to your pond on a regular basis.
What are Clays?
Clay particles are minuscule crystals which are bound together lightly in sheets that can stack together and slip over each other. This is what gives wet clay its smooth, slippery texture. A fresh deposit of clay is created through the weathering of other materials. Examples of this process include kaolinite clay, formed through the weathering of the hard mineral feldspar, and montmorillonite clay which is created through the weathering of volcanic ash.
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