Thanks for clearing all that up. I want to believe that they could co-exist peacefully, it occurred to me that I' got the theory that these "aggressive interlopers" bullied their way into the good lies from a chap who's made questionable statements regarding trout behavior in the past.
By a quirk of fate; I was out for a worm-drowning session with a fishing companion on new years eve afternoon, just to round off the year, and hooked a very fat, pure silver steelhead, about 40 cms long, and with absolutely PERFECT fins! The fish had never spent any time in a fish farm by the looks of it, and I assumed it to be one of the breeding individuals in our river system. There is no closed season on rainbow here in Denmark, but I felt duty bound to return it anyway.
Moggy