The ADAA's constitution fosters all types of fishing, even running sea fishing trips
"(a) To encourage the sport of angling, and in order to foster it, to provide facilities for angling at a reasonable cost for its members by renting, purchasing, exchanging or otherwise acquiring the right to fish for salmon, and fish of the salmon kind, sea trout, brown trout or other freshwater fish in any of the rivers or lochs in the district or elsewhere of interest to the Association"
As such i dont see any reason why members could not fish for any species present on our waters. Non members can get day tickets if they meet the conditions. We dont really have any significant coarse species present, other than small roach in the loch. It is my understanding that they were illegally stocked.
Gudgeon and Roach have been reported in the Don, as have pike and perch, but in tiny numbers. Indeed roach have only been reported once.
I understand that about 6 bass have been caught in the don, perhaps 2 years ago. None were reported last year, or the year before. So other than game fish we have very little to fish for.
Any one fishing ADAA waters for non game fish would surely have a far larger by-catch of game fish and this would cause a problem, both for the ADAA and the baillifs. However if you were willing to put up with the inconvenience of catching game fish as a by-catch, then I am sure the ADAA would have no concerns for any member following the rules.