The owner of that pond has a few of these.. he imports North American monster fish to Thailand and they get HUGE due to the warmer weather. I can't remember how many ponds he has but I think it was 6 on each property and owning 2 properties. Both properties are several acres large.http://www.fishing-in-thailand.com/index.html
I think that is the guy I went with a while back. He has changed the site a bit but the photos are the same. He is a guide and can take you to the "ponds" if you want to do some monster fishing. When I was there I got to see 3 Arapaima in their QT tanks waiting to be released. At that time they were only about 4 feet.