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Fundamental points for Nishikigoi breeding
The most important art of breeding is creating quality water for Nishikigoi. You should maintain the suitable water quality by circulating the pond water, so that dissolved oxygen can activate aerobic bacteria to purify the water.
Let us introduce some points which we are often asked.

①Volume of a pond or an aquarium
To prevent koi from catching diseases or exterminate parasites on koi, we sometimes use salt or medicine. Too much dose will harm and too little will have no effect.
Here is a standard use of salt 5 kg per 1 ton of water.

②Water temperature
It is commonly said that Nishikigoi doesn’t secrete digestive enzymes when the water temperature drops below 12 degrees Celsius. Therefore, in Japan, we reduce the amount of koi food when the temperature begins to drop in autumn until winter seasons. On the contrary, we gradually increase the amount starting in spring toward summer seasons. We also change the feed according to the seasons: easily digestive, low protein food for winter and high protein, colour enrichment added food for active growing. When the seasons change, you must be attentive to the change of water temperature. Water temperature is also important when taking countermeasures for fish diseases.

③Daily observation of koi
You can have a pleasant time viewing koi swimming calmly, but please pay attention to your koi’s health.
Fish diseases don’t make significant progress in a usual environment. Please make it a rule to check the following points.
1) Movements of your koi (they aren’t floating on the water surface, jumping out of water, rubbing their body against the pond wall, or in a stationary state on the pond floor?)
2) Quality of pond or aquarium water (Please check floating excrement, cloudy water, odour and foams.)
Don’t be oversensitive about these, but if any unusual condition lasts for a while, cut back the amount of feed and add to the amount of fresh water supply. Check and see if the amount of feed is proper, the filtration system is clean, otherwise there might be a foreign invasion and deal effectively with them.
Please pay the closest attention to a newcomer in your pond. The koi may contract diseases or parasites easily because of its environmental changes.

④Countermeasures for fish diseases
Congestion or growing of white mucus on the fish surface, or standing scales are signs of your koi suffering from a disease. Please consult your koi farmer of nearby aquatic shop keeper and take a proper measure to deal with the condition. When using medicine, pay attention to the change of water quality as well. There is an infinite variety of ways in keeping koi: according to the size and shape of the pond or aquarium, ages, sizes, number of the koi in it, the situation of equipment, water quality, and the amount of ingredients of feed and so on.
You can find out the best way to keep your koi, while observing the conditions of your koi carefully.

Purchase of Nishikigoi
 We don’t sell Nishikigoi at Nishikigoi no Sato.
Please apply to inquire at koi breeders and dealers in Ojiya City if you wish to purchase Ojiya-bred Nishikigoi at Ojiya Nishikigoi Farming Cooperation.
They have a large assortment of Nishikigoi from reasonable price ones to high-grade ones for koi show to meet your demands. They also dispatch your koi to you.


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Ojiya Nishikigoi no Sato, located in the birthplace of Nishikigoi, is a municipal institution where various historical materials of Nishikigoi are on display.
  1-8-22, Jonai, Ojiya City, Niigata 947-0028
  [Tel/Fax]0258-83-2233  [E-mail]nishikigoi@ojiyasunplaza.jp (Sorry, but we will apply to inquiries in Japanese only.)

[Ojiya-shi designated manager]
Foundation Ojiya-shi Industrial Development Center
  1-8-25, Jonai, Ojiya City, Niigata 947-0028  Tel: 0258-83-4800