WATER QUALITY maria hayward
The TDS in all the concrete ponds is higher than in the mud ponds. One reason for this is that the TDS of the tap water at Muikaichi (0.09ppt) is already relatively high. The high stocking rate and feeding level also increases the TDS.
The pH of the ponds is around 7.0, with the exception of Muikaichi which is 8.5. Between the different water analysis of Muikaichi is a pH-difference of 1.9. Reasons for this could be the low KH from the tap water (2.0 °dH) and the continuous flow of this tap water. Also the composition of this tap water can change over time. Nitrate is also present in the concrete ponds. This could be due to the lack of denitrifying bacteria, algae and other plants that can take up the nitrate. The continuous flow of tap water slowly dilutes the nitrate.
conclusion
The difference between the Dutch tap water and the Japanese ponds where koi are raised, is not so great in terms of chemical composition. The biggest difference is the hardness of the water, namely the KH and GH, which are lower in the analysed ponds in Japan. Next to this the temperature of the Japanese mud ponds (during summer) is not comparable with the temperatures of an average unheated koi pond in the Netherlands during summer.
Next to all the chemical water parameters, there are a lot more (important) external factors which have an influence on the growth and development of koi. Our aim in the Netherlands is to let our koi have at least the same, or maybe even a better, development than in Japan.
I believe that minerals, phytoplankton (for example algae) and zooplankton (for example water fleas and daphnia) next to normal pellet feed have a very important role in the development of the skin quality of koi especially.
Sharing knowledge
The alkalinity dropped due to
photosynthesis, which is caused by algae in the mud ponds
28 KOI CARP
Since my practical training period at Marudo Koi Farm in 2008 I have since returned to complete further work experience in the summer of 2009. I have one aim, and that is to share knowledge. I want to inform Nishikigoi hobbyists about my experiences in Japan, and help to educate about what is best for the koi. That is why I, together with a young, passionate hobbyist named Tiebo Jacobs, started a web log named Nishikigoi Novelle. Go to www.
koiquest.blogspot.com for more articles and information.
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