I lived in Carlisle for 15 years and know the area well. Actually fr3ak, the Pike mostly come from Valens. The stream that runs down from Mountsberg is not really suitable for Pike although I guess small ones could make it. Pike from Valens seems much more likely.
As for the Trout, which I used to get all the time. They disappeared due to construction and stream alterations long before the Pike started showing up. They vanished in a matter of 2 years, it was a shame, I literally used to get them 10 ft from my front door. All the human expansion reduced the amount of water in the stream and man-made obstructions slowed the water causing it to become warmer and unsuitable for trout to survive. For once on this forum it was not the MNR that fukked up it was the ministry of the environment who did not do their research and allowed the work to go on.
I go back every 2 or 3 years now to see if the Trout have made a come back, I was there a few months ago. Unfortunately they have not.
Alfie.