The only negative I can see is the quality of eggs used. In our work we use F-1 eggs, first generation from wild sea-runs. Can't do much better than that. Our brood-stock gene pool is refreshed annually. I think that using this method to seed the proper habitat in small tribs and headwaters makes a lot of sense. Take the human element and hatchery conditioning right out of the equation, and let Mama Nature do her thing.
With the river we work with, there are six dams. Some have upstream fish passage systems, and some have fish passage agreements for future systems installation. All of the dams have downstream passage in place. We've got some natural reproduction taking place, but the dams don't allow for much more of that. But this system is very suitable for our circumstances, and I'm hopefully optimistic that we will be able to switch over to it very soon.
Where it all begins...