The hybrids are the offspring of a striped bass and a white bass.

Landlocked striped bass are not hybrids, they just are landlocked. They do have significant trouble reproducing as described above. Therefore the stocking programs can be easily controlled. And the damage to a local ecosystem could be minimal if managed properly. The people calling foul over this one fish are cray cray. Yes, if you dropped 1000 of these in Candy maybe, but jeeze the cormorants are the ones you should be worried about....