Koi ponds do not come cheap, with the cost of parts often reaching into thousands of pounds. So far James has been able to buy a new net to cover his existing pond, build a waterfall and, of course, buy more wood to build planters.
He discovered the "really expensive" hobby of keeping the fish through his favourite YouTuber James the Koi Whisperer.
"When I first got them I didn't know any of the names of them, and now I've got them I know so much more about fishes," James said.
"He really surprised us," Mike added.
"He knows how to test the water, he knows names and breeds of the koi."
But while James dreams of one day going to Japan to see his beloved koi, as well as building a huge raised pond himself, his parents said they were "incredibly proud" of everything he has already achieved.
