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It depends entirely on the size of the pond, the condition of the water (eg temperature oxidation and how clean it is). The average life span of them is about 60 years old but Koi
http://wiki.answers.com/Q/How_long_do_koi_carp_liv...
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Read the other answers 68f is really good and you do have a pond and you do alot of water changes? The filter should be 4 times as powerful for a fish as dirty as Koi (No offence,
http://answers.yahoo.com/question/index?qid=200901...
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Koi are ornamental domesticated varieties of the common carp Cyprinus carpio. They can live between 15 and 30 years.
http://www.kgbanswers.co.uk/how-long-do-koi-carp-f...
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A good temp for them is in the 60's and low 70's, but they can survive anything from 33 degrees to 90 degrees. Hope this helps!!!
http://answers.yahoo.com/question/index?qid=200909...
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