It's the department of fisheries that do it. It's all old new T1K, i've been posting about it for 12 months.
I'm going to ride up there is the near future and see if i can bluff my way in, or at least talk to someone on site. (good excuse to take my new Kawasaki ER-6n out.)
Like i just wrote though Nakorsawan got hit pretty bad with the flooding, and Bungporapetch, (the lake) will have been flooded out so i don't really know whats going on there at the moment.