Uncommon for this region is to see trout farm. They are mostly seen in mountainous BC or Alberta.
I spent some time watching the guys attending the pools and examining the technical setup of the production (I'm an engineer by the profession).
Very rich water well supplies the pools by the number of pumps. Oxygen is added to the water to simulate mountain creek felling. Fish is separated by the size in different pools.
Now I know from where my trout comes from.