Yes Sam, I'm sure they could all find spots in a river where they feel comfortable. It isn't the same the other way around though. Have you ever had a salmon from a lake? On the Hampshire Avon where I fish, barbel are often seen in the same spots as salmon, they prefer the faster more oxygenated water. You don't find carp and tench inhabiting these areas, they clearly prefer slacker water where available. My point is that a lake is not natural habitat for a barbel, wether or not it can survive for a few years or not?
If you fish rivers for "naturalised carp" that were probably spawned there, they are more than likely long and relatively lean fish in comparison to their lake dwelling water pig grossly overweight cousins that would struggle to survive in the same areas as these fish due to the physical dimensions and inherent drag due to the lack of aerodynamics.
So long as there is a demand for barbel in stillwaters, they will continue to be stocked but as they cannot breed in stillwaters, in the long term, they are unlikely to become more widespread.
Fred Crouch makes some interesting observations in the latest barbel fisher magazine on the effect of pellets on barbel and the likelihood that these huge female fish would struggle to spawn effectively due to their physical dimensions. Whether you agree or not with Fred, he does come up with a valid argument about the lack of juvenile barbel recruitment in our rivers.
Putting barbel into stillwaters would only serve to speed up this process making the fish prone to unhealthy bloated weight gains as well as the effect of not being able to spawn successfully due to lack of suitable habitat causing the fish to become spawnbound and likely to die as a result.
If people want to fish for stillwater barbel, there is little I can do to stop them but for me, I just smile and think...........it's not "barbel fishing" is it? And if anyone thinks it is then I would love to hear your reasons why you might think that!
Regards,
Jeff