There is a big fish in Loch Crocach, or there used to be!

My father and I used to fish Loch Crocach when I was a kid and the Culag Hotel had a boat on it. I particularly remember a wonderful day catching lots of small fish up to 1/2lb in blazing sunshine drifting between the islands and along the south shore.
Another time, and we're talking more than 25 yrs ago now, the one that got away thing happened. Dad was rowing back us from the far east bay of the island part of the loch. I was trolling my flies. We were between the northerly island and the shore, heading out the bay. A small fish took, I started to bring it in, then a big fish took. It headed off into the bay taking loads of line. Then it just sat there. We had to go after it with the boat to get any line back from it. I remember it spent a fair bit of time sitting solid as a rock (which it wasn't, I can assure you!) between short powerful pulls. We never saw it. We never got any line back from it other than by rowing the boat at it. After about 15 mins it had been on a short line for some time (maybe a bad move on my part), it was sitting solidly, and we seemed to have reached some kind of stalemate. Then there was a powerful side to side movement through the line and it was gone. Then up came a small fish on the middle dropper, absolutely knackered! The tail fly - mallard and claret - was quite chewed up.
I have always wondered if it was possible a salmon got in there. But it seemed likely it was a very big, sulky trout.
We're going back to Crocach for the first time in years next week. I doubt anything like that will happen again, but it's a beautiful place and I can't wait! Mike W