I just couldn't bring myself to kill a native fish in a stream. That's why I specified Brookies. The math is really easy. Suppose there's six good pools per mile on skinny water. And there are five catchable trout per pool. The rest are in from a lake or river for spawning or just dinks. One good fly fisher could empty a mile of stream in a few trips if they were keeping them. Now consider the sheer numbers of fisher persons on our streams. Poachers alone already keep too many fish.