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Erns:
My stocking rate has been a max of 16 koi. But, this summer I am over my limit. There are now 20, 5 of which were tosai added in March. I'll reduce the population to 15 by March 2008 to make room for a couple more tosai to grow. Growth has been good. A Nisei Koi Farm tosai Showa added at 9-10" in March 2006 was benched in Size 4 (20-24")at Central Florida Koi Show in March 2007. A Maruyama tosai Kohaku acquired at 10" in March 2005 is now close to 28"... maybe longer the way she has been doing the last two months. She has the genes to grow large. The warm Florida climate gives a long growing season.
Cost for a koi pond is going to vary widely depending on local economic conditions, design features, site conditions and the extent to which the koikeeper does some of the work or acts as his own contractor. Since I did virtually no work and relied completely on the pond builder, and had a constrained site, and had it built in a post-hurricane building boom with materials shortages, the cost was substantial. I tell people to check the cost of having a like sized swimming pool built in their area, add 10% for the extra plumbing (20% if the person knows nothing about how to plumb a koi pond, because there will be errors and time delays), and then add the cost of all the filtration equipment & media, bottom drains/air domes, vortex tank, water pumps and air pumps, and then add a further sum for building a filter pit to have gravity flow to the filters. I could have saved some if I had used larger pumps to serve multiple filters, but I wanted each filter and bottom drain to have its own water pump/air pump. That is what I mean by a design decision.
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