Dave,
The son of the family who live/lived in the house you saw, trained in Inverness (if my memory serves me) in Fishery Management / Rearing and then started his own hatchery but it must be 5 years or more since I have seen any evidence of fish-rearing going on. They did use the pond as a fishery but, again if my memory serves me, they had a problem with the burn overflowing into the pond. I often wonder if the young lad is still involved in fish rearing.
Peter